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Fengdong Yu commented on HDFS-4949: ----------------------------------- Thanks, Andrew. > 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. -- This message was sent by Atlassian JIRA (v6.1#6144)