[jira] Updated: (HADOOP-2909) Improve IPC idle connection management

["Robert Chansler (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-2909?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Chansler updated HADOOP-2909:
------------------------------------

    Fix Version/s:     (was: 0.17.0)

> 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
>
> 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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