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https://issues.apache.org/jira/browse/HDFS-5394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13816945#comment-13816945
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Colin Patrick McCabe commented on HDFS-5394:
--------------------------------------------
Thanks for the +1, will commit shortly.
As mentioned earlier, the javac and the javadoc warning are about the use of
{{sun.misc.Unsafe}}, which we can't really avoid here. I will increase
{{OK_JAVADOC_WARNINGS}} in {{test-patch.sh}} to prevent warning spew. The
javac warning will be ignored automatically on the next build after submission.
> fix race conditions in DN caching and uncaching
> -----------------------------------------------
>
> Key: HDFS-5394
> URL: https://issues.apache.org/jira/browse/HDFS-5394
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode, namenode
> Affects Versions: 3.0.0
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Attachments: HDFS-5394-caching.001.patch,
> HDFS-5394-caching.002.patch, HDFS-5394-caching.003.patch,
> HDFS-5394-caching.004.patch, HDFS-5394.005.patch, HDFS-5394.006.patch,
> HDFS-5394.007.patch, HDFS-5394.008.patch, HDFS-5394.009.patch
>
>
> The DN needs to handle situations where it is asked to cache the same replica
> more than once. (Currently, it can actually do two mmaps and mlocks.) It
> also needs to handle the situation where caching a replica is cancelled
> before said caching completes.
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