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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-9955) RPC idle connection closing is extremely inefficient
Date Wed, 11 Sep 2013 22:19:52 GMT
Daryn Sharp created HADOOP-9955:

             Summary: RPC idle connection closing is extremely inefficient
                 Key: HADOOP-9955
                 URL: https://issues.apache.org/jira/browse/HADOOP-9955
             Project: Hadoop Common
          Issue Type: Sub-task
          Components: ipc
    Affects Versions: 2.0.0-alpha, 3.0.0
            Reporter: Daryn Sharp
            Assignee: Daryn Sharp

The RPC server listener loops accepting connections, distributing the new connections to socket
readers, and then conditionally & periodically performs a scan for idle connections. 
The idle scan choses a _random index range_ to scan in a _synchronized linked list_.

With 20k+ connections, walking the range of indices in the linked list is extremely expensive.
 During the sweep, other threads (socket responder and readers) that want to close connections
are blocked, and no new connections are being accepted.

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