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https://issues.apache.org/jira/browse/HDFS-4949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13805791#comment-13805791
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Colin Patrick McCabe commented on HDFS-4949:
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quick note: The reason why TestOfflineEditsViewer failed in jenkins is that the
consolidated patch didn't change the binary edit log file used by that test.
It succeeds on the branch.
bq. incremental cache reports - HDFS-5092
This is listed as a maybe in the design doc-- it's something that we want to
evaluate before doing
quotas, metrics, and TTL are definitely post-merge, I think.
> Centralized cache management in HDFS
> ------------------------------------
>
> Key: HDFS-4949
> URL: https://issues.apache.org/jira/browse/HDFS-4949
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: datanode, namenode
> Affects Versions: 3.0.0, 2.3.0
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Attachments: caching-design-doc-2013-07-02.pdf,
> caching-design-doc-2013-08-09.pdf, caching-design-doc-2013-10-24.pdf,
> caching-testplan.pdf, HDFS-4949-consolidated.patch
>
>
> HDFS currently has no support for managing or exposing in-memory caches at
> datanodes. This makes it harder for higher level application frameworks like
> Hive, Pig, and Impala to effectively use cluster memory, because they cannot
> explicitly cache important datasets or place their tasks for memory locality.
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