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https://issues.apache.org/jira/browse/HDFS-4949?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Wang updated HDFS-4949:
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Attachment: HDFS-4949-consolidated.patch
New patch attached. The RAT error is spurious due to the CHANGES-HDFS-4949.txt
file. I also want to fix the edits unit test after we merge, since historically
checking in the new binary file has been tricky to get right via patch. We've
gotten clean unit test runs on upstream Jenkins, so I have confidence that it's
correct. Finally, the javac warnings are also intentional, related to using the
internal unmap APIs.
> 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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