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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4296) Spasm of JobClient failures on successful jobs every once in a while
Date Wed, 01 Oct 2008 04:39:44 GMT

    [ 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)

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