private void killUnfinishedAttempt(TaskAttempt attempt, String logMsg) {
if (commitAttempt != null && commitAttempt.equals(attempt)) {
LOG.info("Removing commit attempt: " + commitAttempt);
commitAttempt = null;
}
if (attempt != null && !attempt.isFinished()) {
eventHandler.handle(new TaskAttemptEventKillRequest(attempt.getID(), logMsg));
}
}
@Override
public boolean canCommit(TezTaskAttemptID taskAttemptID) {
writeLock.lock();
try {
if (getState() != TaskState.RUNNING) {
LOG.info("Task not running. Issuing kill to bad commit attempt " + taskAttemptID);
eventHandler.handle(
new TaskAttemptEventKillRequest(taskAttemptID, "Task not running. Bad attempt."));
return false;
}
if (commitAttempt == null) {
TaskAttempt ta = getAttempt(taskAttemptID);
if (ta == null) {
throw new TezUncheckedException("Unknown task for commit: " + taskAttemptID);
}
// Its ok to get a non-locked state snapshot since we handle changes of
// state in the task attempt. Dont want to deadlock here.
TaskAttemptState taState = ta.getStateNoLock();
if (taState == TaskAttemptState.RUNNING) {
commitAttempt = taskAttemptID;
LOG.info(taskAttemptID + " given a go for committing the task output.");
return true;
} else {
LOG.info(
taskAttemptID
+ " with state: "
+ taState
+ " given a no-go for commit because its not running.");
return false;
}
} else {
if (commitAttempt.equals(taskAttemptID)) {
LOG.info(taskAttemptID + " given a go for committing the task output.");
return true;
}
// Don't think this can be a pluggable decision, so simply raise an
// event for the TaskAttempt to delete its output.
// Wait for commit attempt to succeed. Dont kill this. If commit
// attempt fails then choose a different committer. When commit attempt
// succeeds then this and others will be killed
LOG.info(commitAttempt + " is current committer. Commit waiting for: " + taskAttemptID);
return false;
}
} finally {
writeLock.unlock();
}
}