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https://issues.apache.org/jira/browse/HDFS-6912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14135483#comment-14135483
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Hudson commented on HDFS-6912:
------------------------------
SUCCESS: Integrated in Hadoop-Hdfs-trunk #1873 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/1873/])
HDFS-6912. SharedFileDescriptorFactory should not allocate sparse files
(cmccabe) (cmccabe: rev 8008f0e8191b1c7adbed96ed4c380208e3a37692)
* hadoop-common-project/hadoop-common/CHANGES.txt
*
hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/nativeio/SharedFileDescriptorFactory.c
> SharedFileDescriptorFactory should not allocate sparse files
> ------------------------------------------------------------
>
> Key: HDFS-6912
> URL: https://issues.apache.org/jira/browse/HDFS-6912
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: caching
> Affects Versions: 2.5.0
> Environment: HDFS Data node, with 8 gb tmpfs in /dev/shm
> Reporter: Gopal V
> Assignee: Colin Patrick McCabe
> Priority: Minor
> Fix For: 2.6.0
>
> Attachments: HDFS-6912.001.patch, HDFS-6912.002.patch,
> HDFS-6912.003.patch
>
>
> SharedFileDescriptor factory should not allocate sparse files. Sparse files
> can lead to a SIGBUS later in the short-circuit reader when we try to read
> from the sparse file and memory is not available.
> Note that if swap is enabled, we can still get a SIGBUS even with a
> non-sparse file, since the JVM uses MAP_NORESERVE in mmap.
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