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Posted to hdfs-issues@hadoop.apache.org by "linhaiqiang (JIRA)" <ji...@apache.org> on 2016/03/28 04:39:26 UTC

[jira] [Updated] (HDFS-4949) Centralized cache management in HDFS

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

linhaiqiang updated HDFS-4949:
------------------------------
    Fix Version/s:     (was: 2.3.0)

> 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: HDFS-4949-consolidated.patch, 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-branch-2.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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