ZhangHB created HDFS-16882:
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Summary: Add cache hit rate metric in
MountTableResolver#getDestinationForPath
Key: HDFS-16882
URL: https://issues.apache.org/jira/browse/HDFS-16882
Project: Hadoop HDFS
Issue Type: Improvement
Components: rbf
Affects Versions: 3.3.4
Reporter: ZhangHB
Currently, the default value of
"dfs.federation.router.mount-table.cache.enable" is ture，
the default value of "dfs.federation.router.mount-table.max-cache-size" is
10000.
But there is no metric that display cache hit rate, I think we can add a hit
rate metric to watch the Cache performance and better tuning the parameters.
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