binlijin created HDFS-4184:
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Summary: Add new interface for Client to provide more information
Key: HDFS-4184
URL: https://issues.apache.org/jira/browse/HDFS-4184
Project: Hadoop HDFS
Issue Type: New Feature
Reporter: binlijin
When hbase read or write hlog we can use
dfs.datanode.drop.cache.behind.reads、dfs.datanode.drop.cache.behind.writes,
when hbase read hfile during compaction we can use readahead and so on...
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