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From "Vinod Kumar Vavilapalli (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-9678) Standby NN sometimes does not clear needRollbackFsImage
Date Thu, 18 Aug 2016 01:15:23 GMT

     [ https://issues.apache.org/jira/browse/HDFS-9678?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vinod Kumar Vavilapalli updated HDFS-9678:
------------------------------------------
    Target Version/s: 2.7.4  (was: 2.7.3)

2.7.3 is under release process, changing target-version to 2.7.4.

> Standby NN sometimes does not clear needRollbackFsImage
> -------------------------------------------------------
>
>                 Key: HDFS-9678
>                 URL: https://issues.apache.org/jira/browse/HDFS-9678
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Kihwal Lee
>
> When the edit log loader sees {{OP_ROLLING_UPGRADE_START}}, it calls {{setNeedRollbackFsImage(true)}}.
This is cleared on a standby NN only by the checkpointer thread when it actually creates a
rollback image. 
> On {{OP_ROLLING_UPGRADE_FINALIZE}}, the rolling upgrade is finalized, but {{needRollbackFsImage}}
is not cleared, if a rollback image was never created.  This result in perpetual checkpointing
by the standby NN.
> The standby NN thinks it needs to do chekpointing because it needs to create a rollback
image, but since it is not in upgrade mode, it creates a regular checkpoint, not a rollback
image. As a result, the status is not cleared even after creating checkpoint.
> The standby will keep checkpointing back-to-back and they will get uploaded to the active
constantly. We noticed this because of increased sync time on the active.



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