He Xiaoqiao created HDFS-10782:
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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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