[jira] [Commented] (HDFS-12299) Race Between update pipeline and DN Re-Registration

["Konstantin Shvachko (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-12299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16420840#comment-16420840 ] 

Konstantin Shvachko commented on HDFS-12299:
--------------------------------------------

HDFS-12299.001.branch-2.7.patch broke {{TestRetryCacheWithHA}}. It is consistently fails on branch-2.7 now. Any idea [~jojochuang]?

> 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
>             Fix For: 2.9.0, 3.0.0-beta1, 2.8.2, 2.7.6
>
>         Attachments: HDFS-12299-branch-2-002.patch, HDFS-12299-branch-2.patch, HDFS-12299.001.branch-2.7.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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