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Posted to hdfs-issues@hadoop.apache.org by "Andrew Wang (JIRA)" <ji...@apache.org> on 2014/09/15 08:59:33 UTC

[jira] [Commented] (HDFS-6912) SharedFileDescriptorFactory should not allocate sparse files

    [ https://issues.apache.org/jira/browse/HDFS-6912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14133635#comment-14133635 ] 

Andrew Wang commented on HDFS-6912:
-----------------------------------

+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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