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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-4949) Centralized cache management in HDFS
Date Fri, 25 Oct 2013 02:06:02 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4949?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Andrew Wang updated HDFS-4949:

    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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