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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4949) Centralized cache management in HDFS
Date Tue, 02 Jul 2013 20:41:20 GMT
Andrew Wang created HDFS-4949:

             Summary: 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

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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