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From "Chris Trezzo (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10178) Permanent write failures can happen if pipeline recoveries occur for the first packet
Date Mon, 22 Aug 2016 22:49:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15431746#comment-15431746
] 

Chris Trezzo commented on HDFS-10178:
-------------------------------------

Adding 2.6.5 to the target versions with the intention of backporting this to branch-2.6.
Please let me know if you think otherwise. Thanks!

> Permanent write failures can happen if pipeline recoveries occur for the first packet
> -------------------------------------------------------------------------------------
>
>                 Key: HDFS-10178
>                 URL: https://issues.apache.org/jira/browse/HDFS-10178
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>            Priority: Critical
>             Fix For: 2.7.3
>
>         Attachments: HDFS-10178.patch, HDFS-10178.v2.patch, HDFS-10178.v3.patch, HDFS-10178.v4.patch,
HDFS-10178.v5.patch
>
>
> We have observed that write fails permanently if the first packet doesn't go through
properly and pipeline recovery happens. If the write op creates a pipeline, but the actual
data packet does not reach one or more datanodes in time, the pipeline recovery will be done
against the 0-byte partial block.  
> If additional datanodes are added, the block is transferred to the new nodes.  After
the transfer, each node will have a meta file containing the header and 0-length data block
file. The pipeline recovery seems to work correctly up to this point, but write fails when
actual data packet is resent. 



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