[
https://issues.apache.org/jira/browse/HADOOP-4296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12635942#action_12635942
]
Devaraj Das commented on HADOOP-4296:
-------------------------------------
Hi Dhruba, that's a fair point. The RPC handler thread would be blocked during
the scan. I am worried about the submitJob API as well. That does a bunch of
dfs operations too. We probably should do something about that as well (later
on).
However, since we already do dfs scans per job inline in the RPC handler (and
AFAIK there is no noticeable impact), I'd like to see the impact of these
additional dfs lookups on your system... Would that be a lot of work at your
end?
> Spasm of JobClient failures on successful jobs every once in a while
> --------------------------------------------------------------------
>
> Key: HADOOP-4296
> URL: https://issues.apache.org/jira/browse/HADOOP-4296
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.17.1
> Reporter: Joydeep Sen Sarma
> Assignee: dhruba borthakur
> Priority: Critical
> Attachments: 4296_jt_delayretire.patch
>
>
> At very busy times - we get a wave of job client failures all at the same
> time. the failures come when the job is about to complete. when we look at
> the job history files - the jobs are actually complete. Here's the stack:
> 08/09/27 02:18:00 INFO mapred.JobClient: map 100% reduce 98%
> 08/09/27 02:18:41 INFO mapred.JobClient: map 100% reduce 99%
> java.lang.NullPointerException
> at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:993)
> at
> com.facebook.hive.common.columnSetLoader.main(columnSetLoader.java:535)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.apache.hadoop.util.RunJar.main(RunJar.java:155)
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
