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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9289) check genStamp when complete file
Date Wed, 28 Oct 2015 22:41:28 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14979400#comment-14979400
] 

Jing Zhao commented on HDFS-9289:
---------------------------------

bq. What if the updatePipeline RPC call has successfully finished NN side changes but failed
in sending response to client? Should we allow the client to commit the block?

The RPC call will fail on the client side and the client will not use the old GS to commit
the block.

bq. How about we use this JIRA to commit the volatile change (which should fix the reported
issue) and dedicate a follow-on JIRA to the commitBlock GS validation change?

I agree with this proposal. Let's only log a warning msg on the NN side but not throw exception
in this jira.

> check genStamp when complete file
> ---------------------------------
>
>                 Key: HDFS-9289
>                 URL: https://issues.apache.org/jira/browse/HDFS-9289
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Chang Li
>            Assignee: Chang Li
>            Priority: Critical
>         Attachments: HDFS-9289.1.patch, HDFS-9289.2.patch, HDFS-9289.3.patch, HDFS-9289.4.patch
>
>
> we have seen a case of corrupt block which is caused by file complete after a pipelineUpdate,
but the file complete with the old block genStamp. This caused the replicas of two datanodes
in updated pipeline to be viewed as corrupte. Propose to check genstamp when commit block



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