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From "Andrew Purtell (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5543) Add a keepalive option for IPC connections
Date Thu, 08 Mar 2012 20:53:57 GMT
Add a keepalive option for IPC connections

                 Key: HBASE-5543
                 URL: https://issues.apache.org/jira/browse/HBASE-5543
             Project: HBase
          Issue Type: Improvement
          Components: client, coprocessors, ipc
            Reporter: Andrew Purtell

On the user list someone wrote in with a connection failure due to a long running coprocessor:
On Wed, Mar 7, 2012 at 10:59 PM, raghavendhra rahul wrote:
2012-03-08 12:03:09,475 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server Responder, call
execCoprocessor([B@50cb21, getProjection(), rpc version=1, client version=0, methodsFingerPrint=0),
rpc version=1, client version=29, methodsFingerPrint=54742778 from output
2012-03-08 12:03:09,476 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server handler 7 on 60020
caught: java.nio.channels.ClosedChannelException

I suggested in response we might consider give our RPC a keepalive option for calls that may
run for a long time (like execCoprocessor).

LarsH +1ed the idea:
+1 on "keepalive". It's a shame (especially for long running server code) to do all the work,
just to find out at the end that the client has given up.

Or maybe there should be a way to cancel an operation if the clients decides it does not want
to wait any longer (PostgreSQL does that for example). Here that would mean the server would
need to check periodically and coprocessors would need to be written to support that - so
maybe that's no-starter.

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