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From "Jonathan Hsieh (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5543) Add a keepalive option for IPC connections
Date Fri, 09 Mar 2012 03:06:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13225803#comment-13225803

Jonathan Hsieh commented on HBASE-5543:

Instead of adding to the rpc to make it keep alive longer, maybe be make it async, returning
some sort of uuid token that the client can poll (or get notified) for progress instead?
> 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:
> {quote}
> 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
> {quote}
> 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:
> {quote}
> +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.
> {quote}

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