[jira] [Created] (HDFS-4911) Reduce PeerCache timeout to be commensurate with dfs.datanode.socket.reuse.keepalive

["Colin Patrick McCabe (JIRA)" <ji...@apache.org>]

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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