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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: caching-design-doc-2013-07-02.pdf
Here's a design doc that we've been working on internally. It proposes adding
off-heap caches to each datanode using mmap and mlock, managed centrally by the
NameNode.
Any feedback welcomed. I'm hoping we can have a fruitful design discussion on
this JIRA, then perhaps get a branch and start development.
> 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, 2.2.0
> Reporter: Andrew Wang
> Attachments: caching-design-doc-2013-07-02.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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