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From Íñigo Goiri (JIRA) <j...@apache.org>
Subject [jira] [Commented] (HDFS-12514) Cancelled HedgedReads cause block to be marked as suspect on Windows
Date Mon, 02 Oct 2017 16:34:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16188404#comment-16188404
] 

Íñigo Goiri commented on HDFS-12514:
------------------------------------

Thanks [~shahrs87] for the comment.
It's true that we should check the rest of the string.
At this point I would move away from the {{startsWith}} pattern into a regexp though.


> Cancelled HedgedReads cause block to be marked as suspect on Windows
> --------------------------------------------------------------------
>
>                 Key: HDFS-12514
>                 URL: https://issues.apache.org/jira/browse/HDFS-12514
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode, hdfs-client
>            Reporter: Lukas Majercak
>            Assignee: Lukas Majercak
>         Attachments: HDFS-12514.001.patch
>
>
> DFSClient with hedged reads enabled will often close previous spawned connections if
it successfully reads from one of them. This can result in DataNode's BlockSender getting
a socket exception and wrongly marking the block as suspect and to be rescanned for errors.
> This patch is aimed at adding windows specific network related exception messages to
be ignored in BlockSender.sendPacket.



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