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From "He Xiaoqiao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10782) Decrease memory frequent exchange of Centralized Cache Management when run balancer
Date Mon, 22 Aug 2016 04:37:22 GMT
He Xiaoqiao created HDFS-10782:
----------------------------------

             Summary: Decrease memory frequent exchange of Centralized Cache Management when
run balancer
                 Key: HDFS-10782
                 URL: https://issues.apache.org/jira/browse/HDFS-10782
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: balancer & mover, caching
    Affects Versions: 2.7.1
            Reporter: He Xiaoqiao


CachedBlocks currently are transparent for Balancer when active feature of centralized cache
management. This makes DataNode exchange memory frequently, because Balancer does not Distinguish
CachedBlock from blocks, so it may trigger mount of cached/uncached ops.

I think namenode should avoid return CacheBlocks as much as possible when Balanacer#getblocks.



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