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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-312) Connections should not be cached
Date Fri, 18 Aug 2006 18:31:16 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-312?page=all ]

Doug Cutting updated HADOOP-312:
--------------------------------

    Status: Open  (was: Patch Available)

When connecting, we should first create an unconnected socket, then attempt to connect with
an explicit timeout, and retry the connect if it fails.  Otherwise the retries are subject
to whaterver the default timeout is.  Since, with this patch, we're connecting much more,
the connect timeout is more significant and should not be left to the system default.

> Connections should not be cached
> --------------------------------
>
>                 Key: HADOOP-312
>                 URL: http://issues.apache.org/jira/browse/HADOOP-312
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: ipc
>            Reporter: Devaraj Das
>         Assigned To: Devaraj Das
>         Attachments: no_conn_caching.patch, no_connection_caching.patch, no_connection_caching.patch
>
>
> Servers and clients (client include datanodes, tasktrackers, DFSClients & tasks)
should not cache connections or maybe cache them for very short periods of time. Clients should
set up & tear down connections to the servers everytime they need to contact the servers
(including the heartbeats). If connection is cached, then reuse the existing connection for
a few subsequent transactions until the connection expires. The heartbeat interval should
be more so that many more clients (order of  tens of thousands) can be accomodated within
1 heartbeat interval.

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