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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-2909) Improve IPC idle connection management
Date Wed, 27 Feb 2008 18:59:51 GMT
Improve IPC idle connection management
--------------------------------------

                 Key: HADOOP-2909
                 URL: https://issues.apache.org/jira/browse/HADOOP-2909
             Project: Hadoop Core
          Issue Type: Bug
          Components: ipc
    Affects Versions: 0.16.0
            Reporter: Hairong Kuang
             Fix For: 0.17.0


IPC server determines if a connection is idle or not by checking if the connection does not
have any IO activity for a predefined max idle time. An idle connection will be closed even
if the connection still has outstanding requests or replies. This causes RPC failures when
a server becomes slow or if a request takes a long time to be served. In jira, I'd like to
propose the following changes to IPC idle management:
1. Add data structures to the IPC server that keep track of outstanding requests.
2. IPC server does not close a connection that has outstanding requests/replies even when
it has no IO activities for a while.
3. The default client-side max idle time should be in several minutes not 1 second. 
4. The server-side max idle time should be greater than the client-side max idle time, for
example, twice of the client-side max idle time. So server mainly deals with clients that
are crashed without closing 
its connections. 


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