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https://issues.apache.org/jira/browse/MAPREDUCE-5044?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Payne updated MAPREDUCE-5044:
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Attachment: MAPREDUCE-5044.013.patch
{{MAPREDUCE-5044.013.patch}} addresses most of the checkstyle warnings from the
previous pre-commit build. The one exception is for those flagged in
{{TestMRJobs.java}}. It is triggering the alert because of an inner assignments
in the following for loop:
{code}
for (String line; (line = syslogReader.readLine()) != null; ) {
...
}
{code}
The code could be changed to something like the following, but I think that
would be more awkward:
{code}
String line = syslogReader.readLine();
for (String line; line != null; ) {
...
line = syslogReader.readLine();
}
{code}
> Have AM trigger jstack on task attempts that timeout before killing them
> ------------------------------------------------------------------------
>
> Key: MAPREDUCE-5044
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5044
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: mr-am
> Affects Versions: 2.1.0-beta
> Reporter: Jason Lowe
> Assignee: Eric Payne
> Attachments: MAPREDUCE-5044.008.patch, MAPREDUCE-5044.009.patch,
> MAPREDUCE-5044.010.patch, MAPREDUCE-5044.011.patch, MAPREDUCE-5044.012.patch,
> MAPREDUCE-5044.013.patch, MAPREDUCE-5044.v01.patch, MAPREDUCE-5044.v02.patch,
> MAPREDUCE-5044.v03.patch, MAPREDUCE-5044.v04.patch, MAPREDUCE-5044.v05.patch,
> MAPREDUCE-5044.v06.patch, MAPREDUCE-5044.v07.local.patch, Screen Shot
> 2013-11-12 at 1.05.32 PM.png, Screen Shot 2013-11-12 at 1.06.04 PM.png
>
>
> When an AM expires a task attempt it would be nice if it triggered a jstack
> output via SIGQUIT before killing the task attempt. This would be invaluable
> for helping users debug their hung tasks, especially if they do not have
> shell access to the nodes.
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