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HADOOP-16268. Allow StandbyException to be thrown as CallQueueOverflowException when RPC call queue is filled. Contributed by CR Hota.

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This commit is contained in:
Erik Krogen 2019-09-04 08:22:02 -07:00
parent 1ae775975b
commit 337e9b794d
5 changed files with 125 additions and 15 deletions
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5
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeys.java
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@ -109,6 +109,11 @@ public class CommonConfigurationKeys extends CommonConfigurationKeysPublic {
public static final String IPC_COST_PROVIDER_KEY = "cost-provider.impl";
public static final String IPC_BACKOFF_ENABLE = "backoff.enable";
public static final boolean IPC_BACKOFF_ENABLE_DEFAULT = false;
// Callqueue overflow trigger failover for stateless servers.
public static final String IPC_CALLQUEUE_SERVER_FAILOVER_ENABLE =
"callqueue.overflow.trigger.failover";
public static final boolean IPC_CALLQUEUE_SERVER_FAILOVER_ENABLE_DEFAULT =
false;
/**
* IPC scheduler priority levels.

17
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/CallQueueManager.java
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@ -61,6 +61,7 @@ static Class<? extends RpcScheduler> convertSchedulerClass(
}
private volatile boolean clientBackOffEnabled;
private boolean serverFailOverEnabled;
// Atomic refs point to active callQueue
// We have two so we can better control swapping
@ -79,6 +80,10 @@ public CallQueueManager(Class<? extends BlockingQueue<E>> backingClass,
BlockingQueue<E> bq = createCallQueueInstance(backingClass,
priorityLevels, maxQueueSize, namespace, conf);
this.clientBackOffEnabled = clientBackOffEnabled;
this.serverFailOverEnabled = conf.getBoolean(
namespace + "." +
CommonConfigurationKeys.IPC_CALLQUEUE_SERVER_FAILOVER_ENABLE,
CommonConfigurationKeys.IPC_CALLQUEUE_SERVER_FAILOVER_ENABLE_DEFAULT);
this.putRef = new AtomicReference<BlockingQueue<E>>(bq);
this.takeRef = new AtomicReference<BlockingQueue<E>>(bq);
LOG.info("Using callQueue: {}, queueCapacity: {}, " +
@ -88,11 +93,12 @@ public CallQueueManager(Class<? extends BlockingQueue<E>> backingClass,
@VisibleForTesting // only!
CallQueueManager(BlockingQueue<E> queue, RpcScheduler scheduler,
boolean clientBackOffEnabled) {
boolean clientBackOffEnabled, boolean serverFailOverEnabled) {
this.putRef = new AtomicReference<BlockingQueue<E>>(queue);
this.takeRef = new AtomicReference<BlockingQueue<E>>(queue);
this.scheduler = scheduler;
this.clientBackOffEnabled = clientBackOffEnabled;
this.serverFailOverEnabled = serverFailOverEnabled;
}
private static <T extends RpcScheduler> T createScheduler(
@ -249,7 +255,9 @@ boolean addInternal(E e, boolean checkBackoff) {
// ideally this behavior should be controllable too.
private void throwBackoff() throws IllegalStateException {
throw CallQueueOverflowException.DISCONNECT;
throw serverFailOverEnabled ?
CallQueueOverflowException.FAILOVER :
CallQueueOverflowException.DISCONNECT;
}
/**
@ -421,7 +429,10 @@ static class CallQueueOverflowException extends IllegalStateException {
new CallQueueOverflowException(
new RetriableException(TOO_BUSY + " - disconnecting"),
RpcStatusProto.FATAL);
static final CallQueueOverflowException FAILOVER =
new CallQueueOverflowException(
new StandbyException(TOO_BUSY + " - disconnect and failover"),
RpcStatusProto.FATAL);
CallQueueOverflowException(final IOException ioe,
final RpcStatusProto status) {
super("Queue full", new RpcServerException(ioe.getMessage(), ioe){

23
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/FairCallQueue.java
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@ -34,6 +34,7 @@
import com.google.common.annotations.VisibleForTesting;
import org.apache.commons.lang3.NotImplementedException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.CommonConfigurationKeys;
import org.apache.hadoop.ipc.CallQueueManager.CallQueueOverflowException;
import org.apache.hadoop.metrics2.MetricsCollector;
import org.apache.hadoop.metrics2.MetricsRecordBuilder;
@ -77,6 +78,8 @@ private void signalNotEmpty() {
/* Statistic tracking */
private final ArrayList<AtomicLong> overflowedCalls;
/* Failover if queue is filled up */
private boolean serverFailOverEnabled;
/**
* Create a FairCallQueue.
* @param capacity the total size of all sub-queues
@ -108,6 +111,10 @@ public FairCallQueue(int priorityLevels, int capacity, String ns,
}
this.overflowedCalls.add(new AtomicLong(0));
}
this.serverFailOverEnabled = conf.getBoolean(
ns + "." +
CommonConfigurationKeys.IPC_CALLQUEUE_SERVER_FAILOVER_ENABLE,
CommonConfigurationKeys.IPC_CALLQUEUE_SERVER_FAILOVER_ENABLE_DEFAULT);
this.multiplexer = new WeightedRoundRobinMultiplexer(numQueues, ns, conf);
// Make this the active source of metrics
@ -158,10 +165,18 @@ public boolean add(E e) {
final int priorityLevel = e.getPriorityLevel();
// try offering to all queues.
if (!offerQueues(priorityLevel, e, true)) {
// only disconnect the lowest priority users that overflow the queue.
throw (priorityLevel == queues.size() - 1)
? CallQueueOverflowException.DISCONNECT
: CallQueueOverflowException.KEEPALIVE;
CallQueueOverflowException ex;
if (serverFailOverEnabled) {
// Signal clients to failover and try a separate server.
ex = CallQueueOverflowException.FAILOVER;
} else if (priorityLevel == queues.size() - 1){
// only disconnect the lowest priority users that overflow the queue.
ex = CallQueueOverflowException.DISCONNECT;
} else {
ex = CallQueueOverflowException.KEEPALIVE;
}
throw ex;
}
return true;
}

15
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ipc/TestCallQueueManager.java
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@ -384,9 +384,22 @@ public void testCallQueueOverflowExceptions() throws Exception {
RpcScheduler scheduler = Mockito.mock(RpcScheduler.class);
BlockingQueue<Schedulable> queue = Mockito.mock(BlockingQueue.class);
CallQueueManager<Schedulable> cqm =
Mockito.spy(new CallQueueManager<>(queue, scheduler, false));
Mockito.spy(new CallQueueManager<>(queue, scheduler, false, false));
CallQueueManager<Schedulable> cqmTriggerFailover =
Mockito.spy(new CallQueueManager<>(queue, scheduler, false, true));
Schedulable call = new FakeCall(0);
// call queue exceptions that trigger failover
cqmTriggerFailover.setClientBackoffEnabled(true);
doReturn(Boolean.TRUE).when(cqmTriggerFailover).shouldBackOff(call);
try {
cqmTriggerFailover.put(call);
fail("didn't fail");
} catch (Exception ex) {
assertEquals(CallQueueOverflowException.FAILOVER.getCause().getMessage(),
ex.getCause().getMessage());
}
// call queue exceptions passed threw as-is
doThrow(CallQueueOverflowException.KEEPALIVE).when(queue).add(call);
try {

80
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ipc/TestFairCallQueue.java
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@ -28,6 +28,7 @@
import static org.mockito.Mockito.when;
import static org.mockito.Mockito.times;
import org.apache.hadoop.fs.CommonConfigurationKeys;
import org.junit.Before;
import org.junit.Test;
import static org.junit.Assert.*;
@ -148,6 +149,65 @@ public int getAndAdvanceCurrentIndex() {
assertNull(fcq.poll());
}
@SuppressWarnings("unchecked")
@Test
public void testInsertionWithFailover() {
Configuration conf = new Configuration();
// Config for server to throw StandbyException instead of the
// regular RetriableException if call queue is full.
conf.setBoolean(
"ns." + CommonConfigurationKeys.IPC_CALLQUEUE_SERVER_FAILOVER_ENABLE,
true);
// 3 queues, 2 slots each.
fcq = Mockito.spy(new FairCallQueue<>(3, 6, "ns", conf));
Schedulable p0 = mockCall("a", 0);
Schedulable p1 = mockCall("b", 1);
// add to first queue.
addToQueueAndVerify(p0, 1, 0, 0);
// 0:x- 1:-- 2:--
// add to second queue.
addToQueueAndVerify(p1, 0, 1, 0);
// 0:x- 1:x- 2:--
// add to first queue.
addToQueueAndVerify(p0, 1, 0, 0);
// 0:xx 1:x- 2:--
// add to first full queue spills over to second.
addToQueueAndVerify(p0, 1, 1, 0);
// 0:xx 1:xx 2:--
// add to second full queue spills over to third.
addToQueueAndVerify(p1, 0, 1, 1);
// 0:xx 1:xx 2:x-
// add to first and second full queue spills over to third.
addToQueueAndVerify(p0, 1, 1, 1);
// 0:xx 1:xx 2:xx
// adding non-lowest priority with all queues full throws a
// standby exception for client to try another server.
Mockito.reset(fcq);
try {
fcq.add(p0);
fail("didn't fail");
} catch (IllegalStateException ise) {
checkOverflowException(ise, RpcStatusProto.FATAL, true);
}
}
private void addToQueueAndVerify(Schedulable call, int expectedQueue0,
int expectedQueue1, int expectedQueue2) {
Mockito.reset(fcq);
fcq.add(call);
Mockito.verify(fcq, times(expectedQueue0)).offerQueue(0, call);
Mockito.verify(fcq, times(expectedQueue1)).offerQueue(1, call);
Mockito.verify(fcq, times(expectedQueue2)).offerQueue(2, call);
}
@SuppressWarnings("unchecked") // for mock reset.
@Test
public void testInsertion() throws Exception {
@ -215,7 +275,7 @@ public void testInsertion() throws Exception {
fcq.add(p0);
fail("didn't fail");
} catch (IllegalStateException ise) {
checkOverflowException(ise, RpcStatusProto.ERROR);
checkOverflowException(ise, RpcStatusProto.ERROR, false);
}
Mockito.verify(fcq, times(1)).offerQueue(0, p0);
Mockito.verify(fcq, times(1)).offerQueue(1, p0);
@ -228,7 +288,7 @@ public void testInsertion() throws Exception {
fcq.add(p1);
fail("didn't fail");
} catch (IllegalStateException ise) {
checkOverflowException(ise, RpcStatusProto.ERROR);
checkOverflowException(ise, RpcStatusProto.ERROR, false);
}
Mockito.verify(fcq, times(0)).offerQueue(0, p1);
Mockito.verify(fcq, times(1)).offerQueue(1, p1);
@ -241,7 +301,7 @@ public void testInsertion() throws Exception {
fcq.add(p2);
fail("didn't fail");
} catch (IllegalStateException ise) {
checkOverflowException(ise, RpcStatusProto.FATAL);
checkOverflowException(ise, RpcStatusProto.FATAL, false);
}
Mockito.verify(fcq, times(0)).offerQueue(0, p2);
Mockito.verify(fcq, times(0)).offerQueue(1, p2);
@ -280,7 +340,8 @@ public void testInsertion() throws Exception {
Mockito.verify(fcq, times(1)).putQueue(2, p2);
}
private void checkOverflowException(Exception ex, RpcStatusProto status) {
private void checkOverflowException(Exception ex, RpcStatusProto status,
boolean failOverTriggered) {
// should be an overflow exception
assertTrue(ex.getClass().getName() + " != CallQueueOverflowException",
ex instanceof CallQueueOverflowException);
@ -289,10 +350,15 @@ private void checkOverflowException(Exception ex, RpcStatusProto status) {
assertTrue(ioe.getClass().getName() + " != RpcServerException",
ioe instanceof RpcServerException);
RpcServerException rse = (RpcServerException)ioe;
// check error/fatal status and if it embeds a retriable ex.
// check error/fatal status and if it embeds a retriable ex or standby ex.
assertEquals(status, rse.getRpcStatusProto());
assertTrue(rse.getClass().getName() + " != RetriableException",
rse.getCause() instanceof RetriableException);
if (failOverTriggered) {
assertTrue(rse.getClass().getName() + " != RetriableException",
rse.getCause() instanceof StandbyException);
} else {
assertTrue(rse.getClass().getName() + " != RetriableException",
rse.getCause() instanceof RetriableException);
}
}
//