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https://issues.apache.org/jira/browse/HDFS-4949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13838471#comment-13838471
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Andrew Wang commented on HDFS-4949:
-----------------------------------
Hey [~azuryy], since the merge, we've been committing caching-related patches
just to trunk. The branch is now defunct. We're still using this JIRA for
tracking ongoing subtasks though, and some JIRAs also have the "caching" label.
> 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, 2.4.0
> 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 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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