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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7915) The DataNode can sometimes allocate a ShortCircuitShm slot and fail to tell the DFSClient about it because of a network error
Date Fri, 24 Apr 2015 12:02:45 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14510920#comment-14510920
] 

Hudson commented on HDFS-7915:
------------------------------

SUCCESS: Integrated in Hadoop-Yarn-trunk #907 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/907/])
HDFS-8070. Pre-HDFS-7915 DFSClient cannot use short circuit on post-HDFS-7915 DataNode (cmccabe)
(cmccabe: rev a8898445dc9b5cdb7230e2e23a57393c9f378ff0)
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/Receiver.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/BlockReaderFactory.java
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/shortcircuit/TestShortCircuitCache.java


> The DataNode can sometimes allocate a ShortCircuitShm slot and fail to tell the DFSClient
about it because of a network error
> -----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-7915
>                 URL: https://issues.apache.org/jira/browse/HDFS-7915
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.7.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>             Fix For: 2.7.0
>
>         Attachments: HDFS-7915.001.patch, HDFS-7915.002.patch, HDFS-7915.004.patch, HDFS-7915.005.patch,
HDFS-7915.006.patch
>
>
> The DataNode can sometimes allocate a ShortCircuitShm slot and fail to tell the DFSClient
about it because of a network error.  In {{DataXceiver#requestShortCircuitFds}}, the DataNode
can succeed at the first part (mark the slot as used) and fail at the second part (tell the
DFSClient what it did). The "try" block for unregistering the slot only covers a failure in
the first part, not the second part. In this way, a divergence can form between the views
of which slots are allocated on DFSClient and on server.



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