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https://issues.apache.org/jira/browse/HDFS-5950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13924046#comment-13924046
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Chris Nauroth commented on HDFS-5950:
-------------------------------------
It's starting to look like the restricted permissions I saw on /dev/shm was a
one-off problem in a single test cluster. I haven't seen the problem
elsewhere, and I haven't been able to trace the change to any particular rpm.
I've seen 777 permissions on /dev/shm everywhere else I've checked, sometimes
with sticky bit on (which is a good idea). If it does happen, then the error
message you get makes it quite clear that you need to check permissions on
/dev/shm.
Let's not worry about this too much.
> 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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