HADOOP-10281. Create a scheduler, which assigns schedulables a priority level. (Contributed by Chris Li)
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1617643 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Arpit Agarwal
parent
f7ac928a7c
commit
e0a9e1bfb7
@ -505,6 +505,9 @@ Release 2.6.0 - UNRELEASED
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HADOOP-10820. Throw an exception in GenericOptionsParser when passed
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an empty Path. (Alex Holmes and Zhihai Xu via wang)
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HADOOP-10281. Create a scheduler, which assigns schedulables a priority
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level. (Chris Li via Arpit Agarwal)
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OPTIMIZATIONS
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BUG FIXES
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@ -0,0 +1,522 @@
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.ipc;
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import java.lang.ref.WeakReference;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import java.util.Timer;
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import java.util.TimerTask;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.atomic.AtomicLong;
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import java.util.concurrent.atomic.AtomicReference;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.fs.CommonConfigurationKeys;
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import org.apache.hadoop.metrics2.util.MBeans;
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import org.codehaus.jackson.map.ObjectMapper;
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import com.google.common.annotations.VisibleForTesting;
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/**
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* The decay RPC scheduler counts incoming requests in a map, then
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* decays the counts at a fixed time interval. The scheduler is optimized
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* for large periods (on the order of seconds), as it offloads work to the
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* decay sweep.
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*/
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public class DecayRpcScheduler implements RpcScheduler, DecayRpcSchedulerMXBean {
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/**
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* Period controls how many milliseconds between each decay sweep.
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*/
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public static final String IPC_CALLQUEUE_DECAYSCHEDULER_PERIOD_KEY =
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"faircallqueue.decay-scheduler.period-ms";
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public static final long IPC_CALLQUEUE_DECAYSCHEDULER_PERIOD_DEFAULT =
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5000L;
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/**
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* Decay factor controls how much each count is suppressed by on each sweep.
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* Valid numbers are > 0 and < 1. Decay factor works in tandem with period
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* to control how long the scheduler remembers an identity.
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*/
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public static final String IPC_CALLQUEUE_DECAYSCHEDULER_FACTOR_KEY =
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"faircallqueue.decay-scheduler.decay-factor";
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public static final double IPC_CALLQUEUE_DECAYSCHEDULER_FACTOR_DEFAULT =
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0.5;
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/**
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* Thresholds are specified as integer percentages, and specify which usage
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* range each queue will be allocated to. For instance, specifying the list
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* 10, 40, 80
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* implies 4 queues, with
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* - q3 from 80% up
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* - q2 from 40 up to 80
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* - q1 from 10 up to 40
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* - q0 otherwise.
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*/
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public static final String IPC_CALLQUEUE_DECAYSCHEDULER_THRESHOLDS_KEY =
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"faircallqueue.decay-scheduler.thresholds";
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// Specifies the identity to use when the IdentityProvider cannot handle
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// a schedulable.
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public static final String DECAYSCHEDULER_UNKNOWN_IDENTITY =
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"IdentityProvider.Unknown";
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public static final Log LOG = LogFactory.getLog(DecayRpcScheduler.class);
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// Track the number of calls for each schedulable identity
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private final ConcurrentHashMap<Object, AtomicLong> callCounts =
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new ConcurrentHashMap<Object, AtomicLong>();
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// Should be the sum of all AtomicLongs in callCounts
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private final AtomicLong totalCalls = new AtomicLong();
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// Pre-computed scheduling decisions during the decay sweep are
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// atomically swapped in as a read-only map
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private final AtomicReference<Map<Object, Integer>> scheduleCacheRef =
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new AtomicReference<Map<Object, Integer>>();
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// Tune the behavior of the scheduler
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private final long decayPeriodMillis; // How long between each tick
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private final double decayFactor; // nextCount = currentCount / decayFactor
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private final int numQueues; // affects scheduling decisions, from 0 to numQueues - 1
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private final double[] thresholds;
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private final IdentityProvider identityProvider;
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/**
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* This TimerTask will call decayCurrentCounts until
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* the scheduler has been garbage collected.
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*/
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public static class DecayTask extends TimerTask {
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private WeakReference<DecayRpcScheduler> schedulerRef;
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private Timer timer;
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public DecayTask(DecayRpcScheduler scheduler, Timer timer) {
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this.schedulerRef = new WeakReference<DecayRpcScheduler>(scheduler);
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this.timer = timer;
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}
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@Override
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public void run() {
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DecayRpcScheduler sched = schedulerRef.get();
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if (sched != null) {
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sched.decayCurrentCounts();
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} else {
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// Our scheduler was garbage collected since it is no longer in use,
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// so we should terminate the timer as well
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timer.cancel();
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timer.purge();
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}
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}
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}
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/**
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* Create a decay scheduler.
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* @param numQueues number of queues to schedule for
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* @param ns config prefix, so that we can configure multiple schedulers
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* in a single instance.
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* @param conf configuration to use.
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*/
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public DecayRpcScheduler(int numQueues, String ns, Configuration conf) {
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if (numQueues < 1) {
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throw new IllegalArgumentException("number of queues must be > 0");
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}
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this.numQueues = numQueues;
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this.decayFactor = parseDecayFactor(ns, conf);
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this.decayPeriodMillis = parseDecayPeriodMillis(ns, conf);
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this.identityProvider = this.parseIdentityProvider(ns, conf);
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this.thresholds = parseThresholds(ns, conf, numQueues);
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// Setup delay timer
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Timer timer = new Timer();
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DecayTask task = new DecayTask(this, timer);
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timer.scheduleAtFixedRate(task, 0, this.decayPeriodMillis);
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MetricsProxy prox = MetricsProxy.getInstance(ns);
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prox.setDelegate(this);
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}
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// Load configs
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private IdentityProvider parseIdentityProvider(String ns, Configuration conf) {
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List<IdentityProvider> providers = conf.getInstances(
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ns + "." + CommonConfigurationKeys.IPC_CALLQUEUE_IDENTITY_PROVIDER_KEY,
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IdentityProvider.class);
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if (providers.size() < 1) {
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LOG.info("IdentityProvider not specified, " +
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"defaulting to UserIdentityProvider");
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return new UserIdentityProvider();
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}
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return providers.get(0); // use the first
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}
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private static double parseDecayFactor(String ns, Configuration conf) {
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double factor = conf.getDouble(ns + "." +
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IPC_CALLQUEUE_DECAYSCHEDULER_FACTOR_KEY,
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IPC_CALLQUEUE_DECAYSCHEDULER_FACTOR_DEFAULT
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);
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if (factor <= 0 || factor >= 1) {
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throw new IllegalArgumentException("Decay Factor " +
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"must be between 0 and 1");
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}
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return factor;
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}
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private static long parseDecayPeriodMillis(String ns, Configuration conf) {
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long period = conf.getLong(ns + "." +
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IPC_CALLQUEUE_DECAYSCHEDULER_PERIOD_KEY,
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IPC_CALLQUEUE_DECAYSCHEDULER_PERIOD_DEFAULT
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);
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if (period <= 0) {
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throw new IllegalArgumentException("Period millis must be >= 0");
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}
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return period;
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}
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private static double[] parseThresholds(String ns, Configuration conf,
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int numQueues) {
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int[] percentages = conf.getInts(ns + "." +
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IPC_CALLQUEUE_DECAYSCHEDULER_THRESHOLDS_KEY);
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if (percentages.length == 0) {
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return getDefaultThresholds(numQueues);
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} else if (percentages.length != numQueues-1) {
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throw new IllegalArgumentException("Number of thresholds should be " +
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(numQueues-1) + ". Was: " + percentages.length);
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}
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// Convert integer percentages to decimals
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double[] decimals = new double[percentages.length];
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for (int i = 0; i < percentages.length; i++) {
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decimals[i] = percentages[i] / 100.0;
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}
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return decimals;
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}
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/**
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* Generate default thresholds if user did not specify. Strategy is
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* to halve each time, since queue usage tends to be exponential.
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* So if numQueues is 4, we would generate: double[]{0.125, 0.25, 0.5}
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* which specifies the boundaries between each queue's usage.
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* @param numQueues number of queues to compute for
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* @return array of boundaries of length numQueues - 1
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*/
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private static double[] getDefaultThresholds(int numQueues) {
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double[] ret = new double[numQueues - 1];
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double div = Math.pow(2, numQueues - 1);
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for (int i = 0; i < ret.length; i++) {
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ret[i] = Math.pow(2, i)/div;
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}
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return ret;
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}
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/**
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* Decay the stored counts for each user and clean as necessary.
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* This method should be called periodically in order to keep
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* counts current.
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*/
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private void decayCurrentCounts() {
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long total = 0;
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Iterator<Map.Entry<Object, AtomicLong>> it =
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callCounts.entrySet().iterator();
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while (it.hasNext()) {
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Map.Entry<Object, AtomicLong> entry = it.next();
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AtomicLong count = entry.getValue();
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// Compute the next value by reducing it by the decayFactor
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long currentValue = count.get();
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long nextValue = (long)(currentValue * decayFactor);
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total += nextValue;
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count.set(nextValue);
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if (nextValue == 0) {
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// We will clean up unused keys here. An interesting optimization might
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// be to have an upper bound on keyspace in callCounts and only
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// clean once we pass it.
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it.remove();
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}
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}
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// Update the total so that we remain in sync
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totalCalls.set(total);
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// Now refresh the cache of scheduling decisions
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recomputeScheduleCache();
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}
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/**
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* Update the scheduleCache to match current conditions in callCounts.
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*/
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private void recomputeScheduleCache() {
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Map<Object, Integer> nextCache = new HashMap<Object, Integer>();
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for (Map.Entry<Object, AtomicLong> entry : callCounts.entrySet()) {
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Object id = entry.getKey();
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AtomicLong value = entry.getValue();
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long snapshot = value.get();
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int computedLevel = computePriorityLevel(snapshot);
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nextCache.put(id, computedLevel);
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}
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// Swap in to activate
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scheduleCacheRef.set(Collections.unmodifiableMap(nextCache));
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}
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/**
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* Get the number of occurrences and increment atomically.
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* @param identity the identity of the user to increment
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* @return the value before incrementation
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*/
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private long getAndIncrement(Object identity) throws InterruptedException {
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// We will increment the count, or create it if no such count exists
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AtomicLong count = this.callCounts.get(identity);
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if (count == null) {
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// Create the count since no such count exists.
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count = new AtomicLong(0);
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// Put it in, or get the AtomicInteger that was put in by another thread
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AtomicLong otherCount = callCounts.putIfAbsent(identity, count);
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if (otherCount != null) {
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count = otherCount;
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}
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}
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// Update the total
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totalCalls.getAndIncrement();
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// At this point value is guaranteed to be not null. It may however have
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// been clobbered from callCounts. Nonetheless, we return what
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// we have.
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return count.getAndIncrement();
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}
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/**
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* Given the number of occurrences, compute a scheduling decision.
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* @param occurrences how many occurrences
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* @return scheduling decision from 0 to numQueues - 1
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*/
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private int computePriorityLevel(long occurrences) {
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long totalCallSnapshot = totalCalls.get();
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double proportion = 0;
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if (totalCallSnapshot > 0) {
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proportion = (double) occurrences / totalCallSnapshot;
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}
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// Start with low priority queues, since they will be most common
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for(int i = (numQueues - 1); i > 0; i--) {
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if (proportion >= this.thresholds[i - 1]) {
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return i; // We've found our queue number
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}
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}
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// If we get this far, we're at queue 0
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return 0;
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}
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/**
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* Returns the priority level for a given identity by first trying the cache,
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* then computing it.
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* @param identity an object responding to toString and hashCode
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* @return integer scheduling decision from 0 to numQueues - 1
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*/
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private int cachedOrComputedPriorityLevel(Object identity) {
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try {
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long occurrences = this.getAndIncrement(identity);
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// Try the cache
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Map<Object, Integer> scheduleCache = scheduleCacheRef.get();
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if (scheduleCache != null) {
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Integer priority = scheduleCache.get(identity);
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if (priority != null) {
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return priority;
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}
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}
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// Cache was no good, compute it
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return computePriorityLevel(occurrences);
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} catch (InterruptedException ie) {
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LOG.warn("Caught InterruptedException, returning low priority queue");
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return numQueues - 1;
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}
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}
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/**
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* Compute the appropriate priority for a schedulable based on past requests.
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* @param obj the schedulable obj to query and remember
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* @return the queue index which we recommend scheduling in
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*/
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@Override
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public int getPriorityLevel(Schedulable obj) {
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// First get the identity
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String identity = this.identityProvider.makeIdentity(obj);
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if (identity == null) {
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// Identity provider did not handle this
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identity = DECAYSCHEDULER_UNKNOWN_IDENTITY;
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}
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return cachedOrComputedPriorityLevel(identity);
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}
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// For testing
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@VisibleForTesting
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public double getDecayFactor() { return decayFactor; }
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@VisibleForTesting
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public long getDecayPeriodMillis() { return decayPeriodMillis; }
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@VisibleForTesting
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public double[] getThresholds() { return thresholds; }
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@VisibleForTesting
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public void forceDecay() { decayCurrentCounts(); }
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@VisibleForTesting
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public Map<Object, Long> getCallCountSnapshot() {
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HashMap<Object, Long> snapshot = new HashMap<Object, Long>();
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for (Map.Entry<Object, AtomicLong> entry : callCounts.entrySet()) {
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snapshot.put(entry.getKey(), entry.getValue().get());
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}
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return Collections.unmodifiableMap(snapshot);
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}
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@VisibleForTesting
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public long getTotalCallSnapshot() {
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return totalCalls.get();
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}
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/**
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* MetricsProxy is a singleton because we may init multiple schedulers and we
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* want to clean up resources when a new scheduler replaces the old one.
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*/
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private static final class MetricsProxy implements DecayRpcSchedulerMXBean {
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// One singleton per namespace
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private static final HashMap<String, MetricsProxy> INSTANCES =
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new HashMap<String, MetricsProxy>();
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// Weakref for delegate, so we don't retain it forever if it can be GC'd
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private WeakReference<DecayRpcScheduler> delegate;
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private MetricsProxy(String namespace) {
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MBeans.register(namespace, "DecayRpcScheduler", this);
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}
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public static synchronized MetricsProxy getInstance(String namespace) {
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MetricsProxy mp = INSTANCES.get(namespace);
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if (mp == null) {
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// We must create one
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mp = new MetricsProxy(namespace);
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INSTANCES.put(namespace, mp);
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}
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return mp;
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}
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public void setDelegate(DecayRpcScheduler obj) {
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this.delegate = new WeakReference<DecayRpcScheduler>(obj);
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}
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@Override
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public String getSchedulingDecisionSummary() {
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DecayRpcScheduler scheduler = delegate.get();
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if (scheduler == null) {
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return "No Active Scheduler";
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} else {
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return scheduler.getSchedulingDecisionSummary();
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}
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}
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@Override
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public String getCallVolumeSummary() {
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DecayRpcScheduler scheduler = delegate.get();
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if (scheduler == null) {
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return "No Active Scheduler";
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} else {
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return scheduler.getCallVolumeSummary();
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}
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}
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@Override
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public int getUniqueIdentityCount() {
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DecayRpcScheduler scheduler = delegate.get();
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if (scheduler == null) {
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return -1;
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} else {
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return scheduler.getUniqueIdentityCount();
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}
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}
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@Override
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public long getTotalCallVolume() {
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||||
DecayRpcScheduler scheduler = delegate.get();
|
||||
if (scheduler == null) {
|
||||
return -1;
|
||||
} else {
|
||||
return scheduler.getTotalCallVolume();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
public int getUniqueIdentityCount() {
|
||||
return callCounts.size();
|
||||
}
|
||||
|
||||
public long getTotalCallVolume() {
|
||||
return totalCalls.get();
|
||||
}
|
||||
|
||||
public String getSchedulingDecisionSummary() {
|
||||
Map<Object, Integer> decisions = scheduleCacheRef.get();
|
||||
if (decisions == null) {
|
||||
return "{}";
|
||||
} else {
|
||||
try {
|
||||
ObjectMapper om = new ObjectMapper();
|
||||
return om.writeValueAsString(decisions);
|
||||
} catch (Exception e) {
|
||||
return "Error: " + e.getMessage();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
public String getCallVolumeSummary() {
|
||||
try {
|
||||
ObjectMapper om = new ObjectMapper();
|
||||
return om.writeValueAsString(callCounts);
|
||||
} catch (Exception e) {
|
||||
return "Error: " + e.getMessage();
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,30 @@
|
||||
/**
|
||||
* Licensed to the Apache Software Foundation (ASF) under one
|
||||
* or more contributor license agreements. See the NOTICE file
|
||||
* distributed with this work for additional information
|
||||
* regarding copyright ownership. The ASF licenses this file
|
||||
* to you under the Apache License, Version 2.0 (the
|
||||
* "License"); you may not use this file except in compliance
|
||||
* with the License. You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
package org.apache.hadoop.ipc;
|
||||
|
||||
/**
|
||||
* Provides metrics for Decay scheduler.
|
||||
*/
|
||||
public interface DecayRpcSchedulerMXBean {
|
||||
// Get an overview of the requests in history.
|
||||
String getSchedulingDecisionSummary();
|
||||
String getCallVolumeSummary();
|
||||
int getUniqueIdentityCount();
|
||||
long getTotalCallVolume();
|
||||
}
|
||||
@ -0,0 +1,29 @@
|
||||
/**
|
||||
* Licensed to the Apache Software Foundation (ASF) under one
|
||||
* or more contributor license agreements. See the NOTICE file
|
||||
* distributed with this work for additional information
|
||||
* regarding copyright ownership. The ASF licenses this file
|
||||
* to you under the Apache License, Version 2.0 (the
|
||||
* "License"); you may not use this file except in compliance
|
||||
* with the License. You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
package org.apache.hadoop.ipc;
|
||||
|
||||
/**
|
||||
* Implement this interface to be used for RPC scheduling in the fair call queues.
|
||||
*/
|
||||
public interface RpcScheduler {
|
||||
/**
|
||||
* Returns priority level greater than zero as a hint for scheduling.
|
||||
*/
|
||||
int getPriorityLevel(Schedulable obj);
|
||||
}
|
||||
@ -0,0 +1,225 @@
|
||||
/**
|
||||
* Licensed to the Apache Software Foundation (ASF) under one
|
||||
* or more contributor license agreements. See the NOTICE file
|
||||
* distributed with this work for additional information
|
||||
* regarding copyright ownership. The ASF licenses this file
|
||||
* to you under the Apache License, Version 2.0 (the
|
||||
* "License"); you may not use this file except in compliance
|
||||
* with the License. You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
package org.apache.hadoop.ipc;
|
||||
|
||||
import static org.junit.Assert.assertEquals;
|
||||
import static org.junit.Assert.assertNull;
|
||||
import static org.junit.Assert.assertTrue;
|
||||
|
||||
import java.util.concurrent.atomic.AtomicInteger;
|
||||
import java.util.Arrays;
|
||||
import org.junit.Test;
|
||||
import static org.mockito.Mockito.mock;
|
||||
import static org.mockito.Mockito.when;
|
||||
|
||||
import org.apache.hadoop.security.UserGroupInformation;
|
||||
import org.apache.hadoop.conf.Configuration;
|
||||
|
||||
import org.apache.hadoop.fs.CommonConfigurationKeys;
|
||||
|
||||
public class TestDecayRpcScheduler {
|
||||
private Schedulable mockCall(String id) {
|
||||
Schedulable mockCall = mock(Schedulable.class);
|
||||
UserGroupInformation ugi = mock(UserGroupInformation.class);
|
||||
|
||||
when(ugi.getUserName()).thenReturn(id);
|
||||
when(mockCall.getUserGroupInformation()).thenReturn(ugi);
|
||||
|
||||
return mockCall;
|
||||
}
|
||||
|
||||
private DecayRpcScheduler scheduler;
|
||||
|
||||
@Test(expected=IllegalArgumentException.class)
|
||||
public void testNegativeScheduler() {
|
||||
scheduler = new DecayRpcScheduler(-1, "", new Configuration());
|
||||
}
|
||||
|
||||
@Test(expected=IllegalArgumentException.class)
|
||||
public void testZeroScheduler() {
|
||||
scheduler = new DecayRpcScheduler(0, "", new Configuration());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testParsePeriod() {
|
||||
// By default
|
||||
scheduler = new DecayRpcScheduler(1, "", new Configuration());
|
||||
assertEquals(DecayRpcScheduler.IPC_CALLQUEUE_DECAYSCHEDULER_PERIOD_DEFAULT,
|
||||
scheduler.getDecayPeriodMillis());
|
||||
|
||||
// Custom
|
||||
Configuration conf = new Configuration();
|
||||
conf.setLong("ns." + DecayRpcScheduler.IPC_CALLQUEUE_DECAYSCHEDULER_PERIOD_KEY,
|
||||
1058);
|
||||
scheduler = new DecayRpcScheduler(1, "ns", conf);
|
||||
assertEquals(1058L, scheduler.getDecayPeriodMillis());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testParseFactor() {
|
||||
// Default
|
||||
scheduler = new DecayRpcScheduler(1, "", new Configuration());
|
||||
assertEquals(DecayRpcScheduler.IPC_CALLQUEUE_DECAYSCHEDULER_FACTOR_DEFAULT,
|
||||
scheduler.getDecayFactor(), 0.00001);
|
||||
|
||||
// Custom
|
||||
Configuration conf = new Configuration();
|
||||
conf.set("prefix." + DecayRpcScheduler.IPC_CALLQUEUE_DECAYSCHEDULER_FACTOR_KEY,
|
||||
"0.125");
|
||||
scheduler = new DecayRpcScheduler(1, "prefix", conf);
|
||||
assertEquals(0.125, scheduler.getDecayFactor(), 0.00001);
|
||||
}
|
||||
|
||||
public void assertEqualDecimalArrays(double[] a, double[] b) {
|
||||
assertEquals(a.length, b.length);
|
||||
for(int i = 0; i < a.length; i++) {
|
||||
assertEquals(a[i], b[i], 0.00001);
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testParseThresholds() {
|
||||
// Defaults vary by number of queues
|
||||
Configuration conf = new Configuration();
|
||||
scheduler = new DecayRpcScheduler(1, "", conf);
|
||||
assertEqualDecimalArrays(new double[]{}, scheduler.getThresholds());
|
||||
|
||||
scheduler = new DecayRpcScheduler(2, "", conf);
|
||||
assertEqualDecimalArrays(new double[]{0.5}, scheduler.getThresholds());
|
||||
|
||||
scheduler = new DecayRpcScheduler(3, "", conf);
|
||||
assertEqualDecimalArrays(new double[]{0.25, 0.5}, scheduler.getThresholds());
|
||||
|
||||
scheduler = new DecayRpcScheduler(4, "", conf);
|
||||
assertEqualDecimalArrays(new double[]{0.125, 0.25, 0.5}, scheduler.getThresholds());
|
||||
|
||||
// Custom
|
||||
conf = new Configuration();
|
||||
conf.set("ns." + DecayRpcScheduler.IPC_CALLQUEUE_DECAYSCHEDULER_THRESHOLDS_KEY,
|
||||
"1, 10, 20, 50, 85");
|
||||
scheduler = new DecayRpcScheduler(6, "ns", conf);
|
||||
assertEqualDecimalArrays(new double[]{0.01, 0.1, 0.2, 0.5, 0.85}, scheduler.getThresholds());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testAccumulate() {
|
||||
Configuration conf = new Configuration();
|
||||
conf.set("ns." + DecayRpcScheduler.IPC_CALLQUEUE_DECAYSCHEDULER_PERIOD_KEY, "99999999"); // Never flush
|
||||
scheduler = new DecayRpcScheduler(1, "ns", conf);
|
||||
|
||||
assertEquals(0, scheduler.getCallCountSnapshot().size()); // empty first
|
||||
|
||||
scheduler.getPriorityLevel(mockCall("A"));
|
||||
assertEquals(1, scheduler.getCallCountSnapshot().get("A").longValue());
|
||||
assertEquals(1, scheduler.getCallCountSnapshot().get("A").longValue());
|
||||
|
||||
scheduler.getPriorityLevel(mockCall("A"));
|
||||
scheduler.getPriorityLevel(mockCall("B"));
|
||||
scheduler.getPriorityLevel(mockCall("A"));
|
||||
|
||||
assertEquals(3, scheduler.getCallCountSnapshot().get("A").longValue());
|
||||
assertEquals(1, scheduler.getCallCountSnapshot().get("B").longValue());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testDecay() {
|
||||
Configuration conf = new Configuration();
|
||||
conf.set("ns." + DecayRpcScheduler.IPC_CALLQUEUE_DECAYSCHEDULER_PERIOD_KEY, "999999999"); // Never
|
||||
conf.set("ns." + DecayRpcScheduler.IPC_CALLQUEUE_DECAYSCHEDULER_FACTOR_KEY, "0.5");
|
||||
scheduler = new DecayRpcScheduler(1, "ns", conf);
|
||||
|
||||
assertEquals(0, scheduler.getTotalCallSnapshot());
|
||||
|
||||
for (int i = 0; i < 4; i++) {
|
||||
scheduler.getPriorityLevel(mockCall("A"));
|
||||
}
|
||||
|
||||
for (int i = 0; i < 8; i++) {
|
||||
scheduler.getPriorityLevel(mockCall("B"));
|
||||
}
|
||||
|
||||
assertEquals(12, scheduler.getTotalCallSnapshot());
|
||||
assertEquals(4, scheduler.getCallCountSnapshot().get("A").longValue());
|
||||
assertEquals(8, scheduler.getCallCountSnapshot().get("B").longValue());
|
||||
|
||||
scheduler.forceDecay();
|
||||
|
||||
assertEquals(6, scheduler.getTotalCallSnapshot());
|
||||
assertEquals(2, scheduler.getCallCountSnapshot().get("A").longValue());
|
||||
assertEquals(4, scheduler.getCallCountSnapshot().get("B").longValue());
|
||||
|
||||
scheduler.forceDecay();
|
||||
|
||||
assertEquals(3, scheduler.getTotalCallSnapshot());
|
||||
assertEquals(1, scheduler.getCallCountSnapshot().get("A").longValue());
|
||||
assertEquals(2, scheduler.getCallCountSnapshot().get("B").longValue());
|
||||
|
||||
scheduler.forceDecay();
|
||||
|
||||
assertEquals(1, scheduler.getTotalCallSnapshot());
|
||||
assertEquals(null, scheduler.getCallCountSnapshot().get("A"));
|
||||
assertEquals(1, scheduler.getCallCountSnapshot().get("B").longValue());
|
||||
|
||||
scheduler.forceDecay();
|
||||
|
||||
assertEquals(0, scheduler.getTotalCallSnapshot());
|
||||
assertEquals(null, scheduler.getCallCountSnapshot().get("A"));
|
||||
assertEquals(null, scheduler.getCallCountSnapshot().get("B"));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testPriority() {
|
||||
Configuration conf = new Configuration();
|
||||
conf.set("ns." + DecayRpcScheduler.IPC_CALLQUEUE_DECAYSCHEDULER_PERIOD_KEY, "99999999"); // Never flush
|
||||
conf.set("ns." + DecayRpcScheduler.IPC_CALLQUEUE_DECAYSCHEDULER_THRESHOLDS_KEY,
|
||||
"25, 50, 75");
|
||||
scheduler = new DecayRpcScheduler(4, "ns", conf);
|
||||
|
||||
assertEquals(0, scheduler.getPriorityLevel(mockCall("A")));
|
||||
assertEquals(2, scheduler.getPriorityLevel(mockCall("A")));
|
||||
assertEquals(0, scheduler.getPriorityLevel(mockCall("B")));
|
||||
assertEquals(1, scheduler.getPriorityLevel(mockCall("B")));
|
||||
assertEquals(0, scheduler.getPriorityLevel(mockCall("C")));
|
||||
assertEquals(0, scheduler.getPriorityLevel(mockCall("C")));
|
||||
assertEquals(1, scheduler.getPriorityLevel(mockCall("A")));
|
||||
assertEquals(1, scheduler.getPriorityLevel(mockCall("A")));
|
||||
assertEquals(1, scheduler.getPriorityLevel(mockCall("A")));
|
||||
assertEquals(2, scheduler.getPriorityLevel(mockCall("A")));
|
||||
}
|
||||
|
||||
@Test(timeout=2000)
|
||||
public void testPeriodic() throws InterruptedException {
|
||||
Configuration conf = new Configuration();
|
||||
conf.set("ns." + DecayRpcScheduler.IPC_CALLQUEUE_DECAYSCHEDULER_PERIOD_KEY, "10");
|
||||
conf.set("ns." + DecayRpcScheduler.IPC_CALLQUEUE_DECAYSCHEDULER_FACTOR_KEY, "0.5");
|
||||
scheduler = new DecayRpcScheduler(1, "ns", conf);
|
||||
|
||||
assertEquals(10, scheduler.getDecayPeriodMillis());
|
||||
assertEquals(0, scheduler.getTotalCallSnapshot());
|
||||
|
||||
for (int i = 0; i < 64; i++) {
|
||||
scheduler.getPriorityLevel(mockCall("A"));
|
||||
}
|
||||
|
||||
// It should eventually decay to zero
|
||||
while (scheduler.getTotalCallSnapshot() > 0) {
|
||||
Thread.sleep(10);
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user