HDFS-4904. Remove JournalService. Contributed by Arpit Agarwal.
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1493235 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Chris Nauroth
parent
b9753e509c
commit
0d1a994fbb
@ -120,6 +120,8 @@ Trunk (Unreleased)
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HDFS-4633 TestDFSClientExcludedNodes fails sporadically if excluded nodes
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cache expires too quickly (Chris Nauroth via Sanjay)
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HDFS-4904. Remove JournalService. (Arpit Agarwal via cnauroth)
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OPTIMIZATIONS
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BUG FIXES
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@ -1,64 +0,0 @@
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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.hdfs.server.journalservice;
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import java.io.IOException;
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import org.apache.hadoop.hdfs.server.protocol.JournalProtocol;
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import org.apache.hadoop.hdfs.server.protocol.NamespaceInfo;
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/**
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* JournalListener is a callback interface to handle journal records
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* received from the namenode.
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*/
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public interface JournalListener {
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/**
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* Check the namespace information returned by a namenode
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* @param service service that is making the callback
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* @param info returned namespace information from the namenode
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*
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* The application using {@link JournalService} can stop the service if
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* {@code info} validation fails.
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*/
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public void verifyVersion(JournalService service, NamespaceInfo info);
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/**
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* Process the received Journal record
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* @param service {@link JournalService} making the callback
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* @param firstTxnId first transaction Id in the journal
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* @param numTxns number of records
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* @param records journal records
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* @throws IOException on error
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*
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* Any IOException thrown from the listener is thrown back in
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* {@link JournalProtocol#journal}
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*/
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public void journal(JournalService service, long firstTxnId, int numTxns,
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byte[] records) throws IOException;
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/**
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* Roll the editlog
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* @param service {@link JournalService} making the callback
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* @param txid transaction ID to roll at
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*
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* Any IOException thrown from the listener is thrown back in
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* {@link JournalProtocol#startLogSegment}
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*/
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public void startLogSegment(JournalService service, long txid) throws IOException;
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}
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@ -1,366 +0,0 @@
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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.hdfs.server.journalservice;
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import java.io.IOException;
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import java.net.InetSocketAddress;
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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.hdfs.NameNodeProxies;
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import org.apache.hadoop.hdfs.protocol.LayoutVersion;
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import org.apache.hadoop.hdfs.protocol.UnregisteredNodeException;
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import org.apache.hadoop.hdfs.protocol.proto.JournalProtocolProtos.JournalProtocolService;
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import org.apache.hadoop.hdfs.protocolPB.JournalProtocolPB;
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import org.apache.hadoop.hdfs.protocolPB.JournalProtocolServerSideTranslatorPB;
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import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.NamenodeRole;
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import org.apache.hadoop.hdfs.server.common.StorageInfo;
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import org.apache.hadoop.hdfs.server.protocol.FenceResponse;
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import org.apache.hadoop.hdfs.server.protocol.FencedException;
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import org.apache.hadoop.hdfs.server.protocol.JournalInfo;
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import org.apache.hadoop.hdfs.server.protocol.JournalProtocol;
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import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocol;
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import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration;
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import org.apache.hadoop.hdfs.server.protocol.NamespaceInfo;
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import org.apache.hadoop.ipc.ProtobufRpcEngine;
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import org.apache.hadoop.ipc.RPC;
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import org.apache.hadoop.net.NetUtils;
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import org.apache.hadoop.security.UserGroupInformation;
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import com.google.common.annotations.VisibleForTesting;
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import com.google.protobuf.BlockingService;
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/**
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* This class interfaces with the namenode using {@link JournalProtocol} over
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* RPC. It has two modes: <br>
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* <ul>
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* <li>Mode where an RPC.Server is provided from outside, on which it
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* {@link JournalProtocol} is registered. The RPC.Server stop and start is
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* managed outside by the application.</li>
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* <li>Stand alone mode where an RPC.Server is started and managed by the
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* JournalListener.</li>
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* </ul>
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*
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* The received journal operations are sent to a listener over callbacks. The
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* listener implementation can handle the callbacks based on the application
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* requirement.
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*/
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public class JournalService implements JournalProtocol {
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public static final Log LOG = LogFactory.getLog(JournalService.class.getName());
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private final JournalListener listener;
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private final InetSocketAddress nnAddress;
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private final NamenodeRegistration registration;
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private final NamenodeProtocol namenode;
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private final StateHandler stateHandler = new StateHandler();
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private final RPC.Server rpcServer;
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private long epoch = 0;
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private String fencerInfo;
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enum State {
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/** The service is initialized and ready to start. */
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INIT(false, false),
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/**
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* RPC server is started.
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* The service is ready to receive requests from namenode.
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*/
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STARTED(false, false),
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/** The service is fenced by a namenode and waiting for roll. */
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WAITING_FOR_ROLL(false, true),
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/**
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* The existing log is syncing with another source
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* and it accepts journal from Namenode.
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*/
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SYNCING(true, true),
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/** The existing log is in sync and it accepts journal from Namenode. */
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IN_SYNC(true, true),
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/** The service is stopped. */
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STOPPED(false, false);
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final boolean isJournalAllowed;
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final boolean isStartLogSegmentAllowed;
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State(boolean isJournalAllowed, boolean isStartLogSegmentAllowed) {
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this.isJournalAllowed = isJournalAllowed;
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this.isStartLogSegmentAllowed = isStartLogSegmentAllowed;
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}
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}
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static class StateHandler {
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State current = State.INIT;
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synchronized void start() {
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if (current != State.INIT) {
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throw new IllegalStateException("Service cannot be started in "
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+ current + " state.");
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}
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current = State.STARTED;
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}
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synchronized void waitForRoll() {
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if (current != State.STARTED) {
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throw new IllegalStateException("Cannot wait-for-roll in " + current
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+ " state.");
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}
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current = State.WAITING_FOR_ROLL;
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}
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synchronized void startLogSegment() {
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if (current == State.WAITING_FOR_ROLL) {
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current = State.SYNCING;
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}
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}
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synchronized void isStartLogSegmentAllowed() throws IOException {
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if (!current.isStartLogSegmentAllowed) {
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throw new IOException("Cannot start log segment in " + current
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+ " state.");
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}
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}
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synchronized void isJournalAllowed() throws IOException {
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if (!current.isJournalAllowed) {
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throw new IOException("Cannot journal in " + current + " state.");
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}
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}
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synchronized boolean isStopped() {
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if (current == State.STOPPED) {
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LOG.warn("Ignore stop request since the service is in " + current
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+ " state.");
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return true;
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}
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current = State.STOPPED;
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return false;
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}
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}
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/**
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* Constructor to create {@link JournalService} where an RPC server is
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* created by this service.
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* @param conf Configuration
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* @param nnAddr host:port for the active Namenode's RPC server
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* @param serverAddress address to start RPC server to receive
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* {@link JournalProtocol} requests. This can be null, if
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* {@code server} is a valid server that is managed out side this
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* service.
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* @param listener call-back interface to listen to journal activities
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* @throws IOException on error
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*/
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JournalService(Configuration conf, InetSocketAddress nnAddr,
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InetSocketAddress serverAddress, JournalListener listener)
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throws IOException {
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this.nnAddress = nnAddr;
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this.listener = listener;
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this.namenode = NameNodeProxies.createNonHAProxy(conf, nnAddr,
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NamenodeProtocol.class, UserGroupInformation.getCurrentUser(), true)
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.getProxy();
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this.rpcServer = createRpcServer(conf, serverAddress, this);
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String addr = NetUtils.getHostPortString(rpcServer.getListenerAddress());
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StorageInfo storage = new StorageInfo(
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LayoutVersion.getCurrentLayoutVersion(), 0, "", 0);
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registration = new NamenodeRegistration(addr, "", storage,
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NamenodeRole.BACKUP);
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}
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/**
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* Start the service.
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*/
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public void start() {
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stateHandler.start();
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// Start the RPC server
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LOG.info("Starting rpc server");
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rpcServer.start();
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for(boolean registered = false, handshakeComplete = false; ; ) {
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try {
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// Perform handshake
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if (!handshakeComplete) {
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handshake();
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handshakeComplete = true;
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LOG.info("handshake completed");
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}
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// Register with the namenode
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if (!registered) {
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registerWithNamenode();
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registered = true;
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LOG.info("Registration completed");
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break;
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}
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} catch (IOException ioe) {
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LOG.warn("Encountered exception ", ioe);
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} catch (Exception e) {
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LOG.warn("Encountered exception ", e);
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}
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try {
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Thread.sleep(1000);
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} catch (InterruptedException ie) {
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LOG.warn("Encountered exception ", ie);
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}
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}
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stateHandler.waitForRoll();
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try {
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namenode.rollEditLog();
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} catch (IOException e) {
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LOG.warn("Encountered exception ", e);
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}
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}
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/**
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* Stop the service. For application with RPC Server managed outside, the
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* RPC Server must be stopped the application.
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*/
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public void stop() {
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if (!stateHandler.isStopped()) {
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rpcServer.stop();
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}
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}
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@Override
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public void journal(JournalInfo journalInfo, long epoch, long firstTxnId,
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int numTxns, byte[] records) throws IOException {
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if (LOG.isTraceEnabled()) {
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LOG.trace("Received journal " + firstTxnId + " " + numTxns);
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}
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stateHandler.isJournalAllowed();
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verify(epoch, journalInfo);
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listener.journal(this, firstTxnId, numTxns, records);
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}
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@Override
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public void startLogSegment(JournalInfo journalInfo, long epoch, long txid)
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throws IOException {
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if (LOG.isTraceEnabled()) {
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LOG.trace("Received startLogSegment " + txid);
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}
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stateHandler.isStartLogSegmentAllowed();
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verify(epoch, journalInfo);
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listener.startLogSegment(this, txid);
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stateHandler.startLogSegment();
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}
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@Override
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public FenceResponse fence(JournalInfo journalInfo, long epoch,
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String fencerInfo) throws IOException {
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LOG.info("Fenced by " + fencerInfo + " with epoch " + epoch);
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verifyFence(epoch, fencerInfo);
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verify(journalInfo);
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long previousEpoch = epoch;
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this.epoch = epoch;
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this.fencerInfo = fencerInfo;
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// TODO:HDFS-3092 set lastTransId and inSync
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return new FenceResponse(previousEpoch, 0, false);
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}
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/** Create an RPC server. */
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private static RPC.Server createRpcServer(Configuration conf,
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InetSocketAddress address, JournalProtocol impl) throws IOException {
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RPC.setProtocolEngine(conf, JournalProtocolPB.class,
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ProtobufRpcEngine.class);
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JournalProtocolServerSideTranslatorPB xlator =
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new JournalProtocolServerSideTranslatorPB(impl);
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BlockingService service =
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JournalProtocolService.newReflectiveBlockingService(xlator);
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return new RPC.Builder(conf).setProtocol(JournalProtocolPB.class)
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.setInstance(service).setBindAddress(address.getHostName())
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.setPort(address.getPort()).setNumHandlers(1).setVerbose(false).build();
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}
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private void verifyEpoch(long e) throws FencedException {
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if (epoch != e) {
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String errorMsg = "Epoch " + e + " is not valid. "
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+ "Resource has already been fenced by " + fencerInfo
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+ " with epoch " + epoch;
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LOG.warn(errorMsg);
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throw new FencedException(errorMsg);
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}
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}
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private void verifyFence(long e, String fencer) throws FencedException {
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if (e <= epoch) {
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String errorMsg = "Epoch " + e + " from fencer " + fencer
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+ " is not valid. " + "Resource has already been fenced by "
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+ fencerInfo + " with epoch " + epoch;
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LOG.warn(errorMsg);
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throw new FencedException(errorMsg);
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}
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}
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/**
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* Verifies a journal request
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*/
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private void verify(JournalInfo journalInfo) throws IOException {
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String errorMsg = null;
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int expectedNamespaceID = registration.getNamespaceID();
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if (journalInfo.getNamespaceId() != expectedNamespaceID) {
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errorMsg = "Invalid namespaceID in journal request - expected " + expectedNamespaceID
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+ " actual " + journalInfo.getNamespaceId();
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LOG.warn(errorMsg);
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throw new UnregisteredNodeException(journalInfo);
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}
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if (!journalInfo.getClusterId().equals(registration.getClusterID())) {
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errorMsg = "Invalid clusterId in journal request - expected "
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+ journalInfo.getClusterId() + " actual " + registration.getClusterID();
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LOG.warn(errorMsg);
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throw new UnregisteredNodeException(journalInfo);
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}
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}
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/**
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* Verifies a journal request
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*/
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private void verify(long e, JournalInfo journalInfo) throws IOException {
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verifyEpoch(e);
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verify(journalInfo);
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}
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/**
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* Register this service with the active namenode.
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*/
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private void registerWithNamenode() throws IOException {
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NamenodeRegistration nnReg = namenode.register(registration);
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String msg = null;
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if(nnReg == null) { // consider as a rejection
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msg = "Registration rejected by " + nnAddress;
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} else if(!nnReg.isRole(NamenodeRole.NAMENODE)) {
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msg = " Name-node " + nnAddress + " is not active";
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}
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if(msg != null) {
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LOG.error(msg);
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throw new IOException(msg); // stop the node
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}
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}
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private void handshake() throws IOException {
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NamespaceInfo nsInfo = namenode.versionRequest();
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listener.verifyVersion(this, nsInfo);
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registration.setStorageInfo(nsInfo);
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}
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@VisibleForTesting
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long getEpoch() {
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return epoch;
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}
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}
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@ -1,127 +0,0 @@
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/**
|
||||
* 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.hdfs.server.journalservice;
|
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import static org.junit.Assert.assertNotNull;
|
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import java.io.IOException;
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import java.net.InetSocketAddress;
|
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|
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.fs.FileSystem;
|
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import org.apache.hadoop.fs.FileSystemTestHelper;
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import org.apache.hadoop.fs.Path;
|
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import org.apache.hadoop.hdfs.HdfsConfiguration;
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import org.apache.hadoop.hdfs.MiniDFSCluster;
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import org.apache.hadoop.hdfs.server.namenode.NameNode;
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import org.apache.hadoop.hdfs.server.protocol.FenceResponse;
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import org.apache.hadoop.hdfs.server.protocol.FencedException;
|
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import org.apache.hadoop.hdfs.server.protocol.JournalInfo;
|
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import org.junit.Test;
|
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import org.mockito.Mockito;
|
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|
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/**
|
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* Tests for {@link JournalService}
|
||||
*/
|
||||
public class TestJournalService {
|
||||
private MiniDFSCluster cluster;
|
||||
private Configuration conf = new HdfsConfiguration();
|
||||
|
||||
/**
|
||||
* Test calls backs {@link JournalListener#startLogSegment(JournalService, long)} and
|
||||
* {@link JournalListener#journal(JournalService, long, int, byte[])} are
|
||||
* called.
|
||||
*/
|
||||
@Test
|
||||
public void testCallBacks() throws Exception {
|
||||
JournalListener listener = Mockito.mock(JournalListener.class);
|
||||
JournalService service = null;
|
||||
try {
|
||||
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(1).build();
|
||||
cluster.waitActive(0);
|
||||
service = startJournalService(listener);
|
||||
verifyRollLogsCallback(service, listener);
|
||||
verifyJournalCallback(service, listener);
|
||||
verifyFence(service, cluster.getNameNode(0));
|
||||
} finally {
|
||||
if (service != null) {
|
||||
service.stop();
|
||||
}
|
||||
if (cluster != null) {
|
||||
cluster.shutdown();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
private JournalService startJournalService(JournalListener listener)
|
||||
throws IOException {
|
||||
InetSocketAddress nnAddr = cluster.getNameNode(0).getNameNodeAddress();
|
||||
InetSocketAddress serverAddr = new InetSocketAddress(0);
|
||||
JournalService service = new JournalService(conf, nnAddr, serverAddr,
|
||||
listener);
|
||||
service.start();
|
||||
return service;
|
||||
}
|
||||
|
||||
/**
|
||||
* Starting {@link JournalService} should result in Namenode calling
|
||||
* {@link JournalService#startLogSegment}, resulting in callback
|
||||
* {@link JournalListener#rollLogs}
|
||||
*/
|
||||
private void verifyRollLogsCallback(JournalService s, JournalListener l)
|
||||
throws IOException {
|
||||
Mockito.verify(l, Mockito.times(1)).startLogSegment(Mockito.eq(s), Mockito.anyLong());
|
||||
}
|
||||
|
||||
/**
|
||||
* File system write operations should result in JournalListener call
|
||||
* backs.
|
||||
*/
|
||||
private void verifyJournalCallback(JournalService s, JournalListener l) throws IOException {
|
||||
Path fileName = new Path("/tmp/verifyJournalCallback");
|
||||
FileSystem fs = cluster.getFileSystem();
|
||||
FileSystemTestHelper.createFile(fs, fileName);
|
||||
fs.delete(fileName, true);
|
||||
Mockito.verify(l, Mockito.atLeastOnce()).journal(Mockito.eq(s),
|
||||
Mockito.anyLong(), Mockito.anyInt(), (byte[]) Mockito.any());
|
||||
}
|
||||
|
||||
public void verifyFence(JournalService s, NameNode nn) throws Exception {
|
||||
String cid = nn.getNamesystem().getClusterId();
|
||||
int nsId = nn.getNamesystem().getFSImage().getNamespaceID();
|
||||
int lv = nn.getNamesystem().getFSImage().getLayoutVersion();
|
||||
|
||||
// Fence the journal service
|
||||
JournalInfo info = new JournalInfo(lv, cid, nsId);
|
||||
long currentEpoch = s.getEpoch();
|
||||
|
||||
// New epoch lower than the current epoch is rejected
|
||||
try {
|
||||
s.fence(info, (currentEpoch - 1), "fencer");
|
||||
} catch (FencedException ignore) { /* Ignored */ }
|
||||
|
||||
// New epoch equal to the current epoch is rejected
|
||||
try {
|
||||
s.fence(info, currentEpoch, "fencer");
|
||||
} catch (FencedException ignore) { /* Ignored */ }
|
||||
|
||||
// New epoch higher than the current epoch is successful
|
||||
FenceResponse resp = s.fence(info, currentEpoch+1, "fencer");
|
||||
assertNotNull(resp);
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user