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https://issues.apache.org/jira/browse/HDFS-5950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13921722#comment-13921722
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Chris Nauroth commented on HDFS-5950:
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bq. It would be very odd for /dev/shm not to be world-writable. Sort of on par
with /tmp not being world-writable. What Linux distribution did you see this on?
This was a CentOS 6 box, but I've typically seen /dev/shm world-writable on
stock CentOS installs. We're trying to track down if there may have been a
particular rpm install that changed the permissions. I'll comment back here if
I find anything.
> The DFSClient and DataNode should use shared memory segments to communicate
> short-circuit information
> -----------------------------------------------------------------------------------------------------
>
> Key: HDFS-5950
> URL: https://issues.apache.org/jira/browse/HDFS-5950
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode, hdfs-client
> Affects Versions: 2.4.0
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Fix For: 2.4.0
>
> Attachments: HDFS-5950.001.patch, HDFS-5950.003.patch,
> HDFS-5950.004.patch, HDFS-5950.006.patch, HDFS-5950.007.patch,
> HDFS-5950.008.patch
>
>
> The DFSClient and DataNode should use the shared memory segments and unified
> cache added in the other HDFS-5182 subtasks to communicate short-circuit
> information.
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