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https://issues.apache.org/jira/browse/HDFS-6912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14133635#comment-14133635
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Andrew Wang commented on HDFS-6912:
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+1 LGTM, thanks Colin
> 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
> 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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