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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15660) Printing extra refs in ITBLL.Verify reducer can cause reducers to be killed due to lack of progress
Date Fri, 15 Apr 2016 16:49:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15243208#comment-15243208
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Josh Elser commented on HBASE-15660:
------------------------------------

The change is dirt simple, but I need to rerun with it just to make sure that it's working
as I expect it should.

> Printing extra refs in ITBLL.Verify reducer can cause reducers to be killed due to lack
of progress
> ---------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-15660
>                 URL: https://issues.apache.org/jira/browse/HBASE-15660
>             Project: HBase
>          Issue Type: Bug
>          Components: integration tests
>            Reporter: Josh Elser
>            Assignee: Josh Elser
>            Priority: Minor
>             Fix For: 2.0.0, 1.1.5, 1.2.2
>
>
> In debugging an ITBLL job which has numerous failures, I saw that instead of the Verify
job completing and reporting that there were a large number of UNDEF nodes, the reducers in
the Verify were failing due to lack of progress.
> The reducer's syslog file was filled with information from the {{dumpExtraInfoOnRefs()}}
method. I believe that when a reducer is repeatedly doing these lookups, the MR framework
doesn't realize that any progress is being made (nothing is being written to the context)
and eventually kills the reducer task. This ultimately causes the entire Verify job to fail
because the reducer fails in the same manner each time.
> We should make sure to invoke {{context.progress()}} when we do these lookups to let
the framework know that we're still doing "our thing".



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