Colin Patrick McCabe created HDFS-4911:
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Summary: Reduce PeerCache timeout to be commensurate with
dfs.datanode.socket.reuse.keepalive
Key: HDFS-4911
URL: https://issues.apache.org/jira/browse/HDFS-4911
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Colin Patrick McCabe
Priority: Minor
The default timeout for the client's PeerCache is much longer than the DataNode
would possibly keep the socket open. Specifically,
{{dfs.client.socketcache.expiryMsec}} defaults to 2 *
60 * 1000 (2 minutes), whereas {{dfs.datanode.socket.reuse.keepalive}}
defaults to 1000 (1 second). We should make these more similar to minimize
situations where the client tries to use sockets which have gone stale.
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