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From "Daniel Templeton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6657) job history server can fail on startup when NameNode is in start phase
Date Fri, 13 May 2016 18:53:13 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15283005#comment-15283005
] 

Daniel Templeton commented on MAPREDUCE-6657:
---------------------------------------------

[~haibochen], thanks.  As long as you file the follow-up JIRA, I'm fine with that.  I've encountered
the same issue with HDFS exception handling before and dealt with it the same way.  Fixing
HDFS is out of scope for this change.

> job history server can fail on startup when NameNode is in start phase
> ----------------------------------------------------------------------
>
>                 Key: MAPREDUCE-6657
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6657
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobhistoryserver
>            Reporter: Haibo Chen
>            Assignee: Haibo Chen
>         Attachments: mapreduce6657.001.patch, mapreduce6657.002.patch, mapreduce6657.003.patch,
mapreduce6657.004.patch, mapreduce6657.005.patch, mapreduce6657.006.patch
>
>
> Job history server will try to create a history directory in HDFS on startup. When NameNode
is in safe mode, it will keep retrying for a configurable time period.  However, it should
also keeps retrying if the name node is in start state. Safe mode does not happen until the
NN is out of the startup phase. 
> A RetriableException with the text "NameNode still not started" is thrown when the NN
is in its internal service startup phase. We should add the check for this specific exception
in isBecauseSafeMode() to account for that.



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