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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (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, 13 Mar 2015 23:51:39 GMT

     [ https://issues.apache.org/jira/browse/HDFS-7915?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Colin Patrick McCabe updated HDFS-7915:
---------------------------------------
    Attachment: 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
> -----------------------------------------------------------------------------------------------------------------------------
>
>                 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
>         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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