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Posted to mapreduce-issues@hadoop.apache.org by "Ravi Prakash (JIRA)" <ji...@apache.org> on 2012/04/27 00:14:50 UTC
[jira] [Commented] (MAPREDUCE-4088) Task stuck in JobLocalizer
prevented other tasks on the same node from committing
[ https://issues.apache.org/jira/browse/MAPREDUCE-4088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13263197#comment-13263197 ]
Ravi Prakash commented on MAPREDUCE-4088:
-----------------------------------------
Courtesy Koji
{quote}
Each TaskTracker has a single thread for taskCleanup taking work from
tasksToCleanup queue.
For each task to cleanup, it firsts call
checkJobStatusAndWait(action);
And inside
{noformat}
private void checkJobStatusAndWait(TaskTrackerAction action)
...
synchronized (runningJobs) {
rjob = runningJobs.get(jobId);
}
if (rjob != null) {
synchronized (rjob) {
while (rjob.localizing) {
rjob.wait();
}
}
}
{noformat}
So this thread would wait while the task is being localized.
Even if one task is hung on localization, entire cleanup is stopped.
{quote}
East or west! Koji is the best!
Soda lemon ginger pop! Koji is on the top!
Yyaayyy yaayyyy yaayyyy for Koji!
> Task stuck in JobLocalizer prevented other tasks on the same node from committing
> ---------------------------------------------------------------------------------
>
> Key: MAPREDUCE-4088
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4088
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv1
> Affects Versions: 0.20.205.0
> Reporter: Ravi Prakash
> Assignee: Ravi Prakash
> Priority: Critical
>
> We saw that as a result of HADOOP-6963, one task was stuck in this
> Thread 23668: (state = IN_NATIVE)
> - java.io.UnixFileSystem.getBooleanAttributes0(java.io.File) @bci=0 (Compiled frame; information may be imprecise)
> - java.io.UnixFileSystem.getBooleanAttributes(java.io.File) @bci=2, line=228 (Compiled frame)
> - java.io.File.exists() @bci=20, line=733 (Compiled frame)
> - org.apache.hadoop.fs.FileUtil.getDU(java.io.File) @bci=3, line=446 (Compiled frame)
> - org.apache.hadoop.fs.FileUtil.getDU(java.io.File) @bci=52, line=455 (Compiled frame)
> - org.apache.hadoop.fs.FileUtil.getDU(java.io.File) @bci=52, line=455 (Compiled frame)
> ....
> .... TONS MORE OF THIS SAME LINE
> - org.apache.hadoop.fs.FileUtil.getDU(java.io.File) @bci=52, line=455 (Compiled frame)
> .....
> .....
> - org.apache.hadoop.fs.FileUtil.getDU(java.io.File) @bci=52, line=455 (Compiled frame)
> - org.apache.hadoop.fs.FileUtil.getDU(java.io.File) @bci=52, line=455 (Interpreted frame)
> ne=451 (Interpreted frame)
> - org.apache.hadoop.mapred.JobLocalizer.downloadPrivateCacheObjects(org.apache.hadoop.conf.Configuration, java.net.URI[], org.apache.hadoop.fs.Path[], long[], boolean[], boolean) @bci=150, line=324 (Interpreted frame)
> - org.apache.hadoop.mapred.JobLocalizer.downloadPrivateCache(org.apache.hadoop.conf.Configuration) @bci=40, line=349 (Interpreted frame) 51, line=383 (Interpreted frame)
> - org.apache.hadoop.mapred.JobLocalizer.runSetup(java.lang.String, java.lang.String, org.apache.hadoop.fs.Path, org.apache.hadoop.mapred.TaskUmbilicalProtocol) @bci=46, line=477 (Interpreted frame)
> - org.apache.hadoop.mapred.JobLocalizer$3.run() @bci=20, line=534 (Interpreted frame)
> - org.apache.hadoop.mapred.JobLocalizer$3.run() @bci=1, line=531 (Interpreted frame)
> - java.security.AccessController.doPrivileged(java.security.PrivilegedExceptionAction, java.security.AccessControlContext) @bci=0 (Interpreted frame)
> - javax.security.auth.Subject.doAs(javax.security.auth.Subject, java.security.PrivilegedExceptionAction) @bci=42, line=396 (Interpreted frame)
> - org.apache.hadoop.security.UserGroupInformation.doAs(java.security.PrivilegedExceptionAction) @bci=14, line=1082 (Interpreted frame)
> - org.apache.hadoop.mapred.JobLocalizer.main(java.lang.String[]) @bci=266, line=530 (Interpreted frame)
> While all other tasks on the same node were stuck in
> Thread 32141: (state = BLOCKED)
> - java.lang.Thread.sleep(long) @bci=0 (Interpreted frame)
> - org.apache.hadoop.mapred.Task.commit(org.apache.hadoop.mapred.TaskUmbilicalProtocol, org.apache.hadoop.mapred.Task$TaskReporter, org.apache.hadoop.mapreduce.OutputCommitter) @bci=24, line=980 (Compiled frame)
> - org.apache.hadoop.mapred.Task.done(org.apache.hadoop.mapred.TaskUmbilicalProtocol, org.apache.hadoop.mapred.Task$TaskReporter) @bci=146, line=871 (Interpreted frame)
> - org.apache.hadoop.mapred.ReduceTask.run(org.apache.hadoop.mapred.JobConf, org.apache.hadoop.mapred.TaskUmbilicalProtocol) @bci=470, line=423 (Interpreted frame)
> - org.apache.hadoop.mapred.Child$4.run() @bci=29, line=255 (Interpreted frame)
> - java.security.AccessController.doPrivileged(java.security.PrivilegedExceptionAction, java.security.AccessControlContext) @bci=0 (Interpreted frame)
> - javax.security.auth.Subject.doAs(javax.security.auth.Subject, java.security.PrivilegedExceptionAction) @bci=42, line=396 (Interpreted frame)
> - org.apache.hadoop.security.UserGroupInformation.doAs(java.security.PrivilegedExceptionAction) @bci=14, line=1082 (Interpreted frame)
> - org.apache.hadoop.mapred.Child.main(java.lang.String[]) @bci=738, line=249 (Interpreted frame)
> This should never happen. A stuck task should never prevent other tasks from different jobs on the same node from committing.
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