/**
* Attempt to kill a running task. If the task has not started running, it will not start. If it's
* already running, a kill request will be sent to it.
*
* <p>The AM will be informed about the task kill.
*/
public void killTask() {
if (!isCompleted.get()) {
if (!killInvoked.getAndSet(true)) {
synchronized (this) {
LOG.info(
"Kill task requested for id={}, taskRunnerSetup={}",
taskSpec.getTaskAttemptID(),
(taskRunner != null));
if (taskRunner != null) {
killtimerWatch.start();
LOG.info("Issuing kill to task {}", taskSpec.getTaskAttemptID());
boolean killed = taskRunner.killTask();
if (killed) {
// Sending a kill message to the AM right here. Don't need to wait for the task to
// complete.
LOG.info(
"Kill request for task {} completed. Informing AM", taskSpec.getTaskAttemptID());
reportTaskKilled();
} else {
LOG.info(
"Kill request for task {} did not complete because the task is already complete",
taskSpec.getTaskAttemptID());
}
shouldRunTask = false;
} else {
// If the task hasn't started, and it is killed - report back to the AM that the task
// has been killed.
LOG.debug("Reporting taskKilled for non-started fragment {}", getRequestId());
reportTaskKilled();
}
if (!isStarted.get()) {
// If the task hasn't started - inform about fragment completion immediately. It's
// possible for
// the callable to never run.
fragmentCompletionHanler.fragmentComplete(fragmentInfo);
this.amReporter.unregisterTask(request.getAmHost(), request.getAmPort());
}
}
} else {
// This should not happen.
LOG.warn(
"Ignoring kill request for task {} since a previous kill request was processed",
taskSpec.getTaskAttemptID());
}
} else {
LOG.info(
"Ignoring kill request for task {} since it's already complete",
taskSpec.getTaskAttemptID());
}
}
@Override
protected TaskRunner2Result callInternal() throws Exception {
isStarted.set(true);
this.startTime = System.currentTimeMillis();
this.threadName = Thread.currentThread().getName();
if (LOG.isDebugEnabled()) {
LOG.debug("canFinish: " + taskSpec.getTaskAttemptID() + ": " + canFinish());
}
// Unregister from the AMReporter, since the task is now running.
this.amReporter.unregisterTask(request.getAmHost(), request.getAmPort());
synchronized (this) {
if (!shouldRunTask) {
LOG.info("Not starting task {} since it was killed earlier", taskSpec.getTaskAttemptID());
return new TaskRunner2Result(EndReason.KILL_REQUESTED, null, false);
}
}
// TODO This executor seems unnecessary. Here and TezChild
ExecutorService executorReal =
Executors.newFixedThreadPool(
1, new ThreadFactoryBuilder().setDaemon(true).setNameFormat("TezTaskRunner").build());
executor = MoreExecutors.listeningDecorator(executorReal);
// TODO Consolidate this code with TezChild.
runtimeWatch.start();
UserGroupInformation taskUgi = UserGroupInformation.createRemoteUser(request.getUser());
taskUgi.addCredentials(credentials);
Map<String, ByteBuffer> serviceConsumerMetadata = new HashMap<>();
serviceConsumerMetadata.put(
TezConstants.TEZ_SHUFFLE_HANDLER_SERVICE_ID,
TezCommonUtils.convertJobTokenToBytes(jobToken));
Multimap<String, String> startedInputsMap = createStartedInputMap(request.getFragmentSpec());
UserGroupInformation taskOwner =
UserGroupInformation.createRemoteUser(request.getTokenIdentifier());
final InetSocketAddress address =
NetUtils.createSocketAddrForHost(request.getAmHost(), request.getAmPort());
SecurityUtil.setTokenService(jobToken, address);
taskOwner.addToken(jobToken);
umbilical =
taskOwner.doAs(
new PrivilegedExceptionAction<LlapTaskUmbilicalProtocol>() {
@Override
public LlapTaskUmbilicalProtocol run() throws Exception {
return RPC.getProxy(
LlapTaskUmbilicalProtocol.class,
LlapTaskUmbilicalProtocol.versionID,
address,
conf);
}
});
taskReporter =
new LlapTaskReporter(
umbilical,
confParams.amHeartbeatIntervalMsMax,
confParams.amCounterHeartbeatInterval,
confParams.amMaxEventsPerHeartbeat,
new AtomicLong(0),
request.getContainerIdString());
String attemptId = fragmentInfo.getFragmentIdentifierString();
IOContextMap.setThreadAttemptId(attemptId);
try {
synchronized (this) {
if (shouldRunTask) {
taskRunner =
new TezTaskRunner2(
conf,
taskUgi,
fragmentInfo.getLocalDirs(),
taskSpec,
request.getAppAttemptNumber(),
serviceConsumerMetadata,
envMap,
startedInputsMap,
taskReporter,
executor,
objectRegistry,
pid,
executionContext,
memoryAvailable,
false);
}
}
if (taskRunner == null) {
LOG.info("Not starting task {} since it was killed earlier", taskSpec.getTaskAttemptID());
return new TaskRunner2Result(EndReason.KILL_REQUESTED, null, false);
}
try {
TaskRunner2Result result = taskRunner.run();
if (result.isContainerShutdownRequested()) {
LOG.warn("Unexpected container shutdown requested while running task. Ignoring");
}
isCompleted.set(true);
return result;
} finally {
FileSystem.closeAllForUGI(taskUgi);
LOG.info(
"ExecutionTime for Container: "
+ request.getContainerIdString()
+ "="
+ runtimeWatch.stop().elapsedMillis());
if (LOG.isDebugEnabled()) {
LOG.debug(
"canFinish post completion: " + taskSpec.getTaskAttemptID() + ": " + canFinish());
}
}
} finally {
IOContextMap.clearThreadAttempt(attemptId);
}
}