hdfs client metadata cache
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Key: HDFS-1214
URL: https://issues.apache.org/jira/browse/HDFS-1214
Project: Hadoop HDFS
Issue Type: New Feature
Components: hdfs client
Reporter: Joydeep Sen Sarma
In some applications, latency is affected by the cost of making rpc calls to
namenode to fetch metadata. the most obvious case are calls to fetch
file/directory status. applications like hive like to make optimizations based
on file size/number etc. - and for such optimizations - 'recent' status data
(as opposed to most up-to-date) is acceptable. in such cases, a cache on the
DFS client that transparently caches metadata would be greatly benefit
applications.
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