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From "Brahma Reddy Battula (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-12299) Race Between update pipeline and DN Re-Registration
Date Thu, 24 Aug 2017 02:10:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-12299?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Brahma Reddy Battula updated HDFS-12299:
----------------------------------------
    Attachment: HDFS-12299-branch-2-002.patch

Updated patch to fix the {{checkstyle}} and testcase to reproduce all the time without fix.

Kindly review.IMHO, this should go to {{2.8.2}} release.

> Race Between update pipeline and DN Re-Registration
> ---------------------------------------------------
>
>                 Key: HDFS-12299
>                 URL: https://issues.apache.org/jira/browse/HDFS-12299
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Brahma Reddy Battula
>            Assignee: Brahma Reddy Battula
>            Priority: Critical
>         Attachments: HDFS-12299-branch-2-002.patch, HDFS-12299-branch-2.patch, HDFS-12299.patch
>
>
>  *Scenario*   
>  - Started pipeline with DN1->DN2->DN3
>  - DN1 is re-reg and update pipeline is called
>  - Update pipeline will success with DN1->DN3->DN4
>  - Again update pipeline is called,which will fail with NPE.
> In step3 updatepipeline will set the storages as null since DN1 re-reg(which will remove
and add the storages)
> {{FSNamesystem#updatePipelineInternal}}
> {code}
>    lastBlock.getUnderConstructionFeature().setExpectedLocations(lastBlock,
>         storages, lastBlock.getBlockType())
> {code}



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