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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4087) HConnectionManager should perform validation of connection it hands out
Date Wed, 13 Jul 2011 09:58:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13064461#comment-13064461
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Ted Yu commented on HBASE-4087:
-------------------------------

Patch version 2 addresses Srivas' comment.
It is incomplete. I want to get confirmation that similar changes should be made to the files
I mentioned in my email to dev@

The undeclaredThrowable field of UndeclaredThrowableException is an IOException, similar to
the following:
{code}
java.io.IOException: Call to /192.168.2.107:60697 failed on local exception: java.io.IOException:
Connection reset by peer
{code}

A test for this JIRA has been added in HBASE-4052: TestMasterRestartAfterDisablingTable. I
used that test to obtain the above information.
Without fix for this JIRA, TestMasterRestartAfterDisablingTable wouldn't pass.

> HConnectionManager should perform validation of connection it hands out
> -----------------------------------------------------------------------
>
>                 Key: HBASE-4087
>                 URL: https://issues.apache.org/jira/browse/HBASE-4087
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Ted Yu
>            Priority: Critical
>             Fix For: 0.92.0
>
>         Attachments: 4087-v2.txt, 4087.txt
>
>
> Through HBASE-3777, HConnectionManager reuses the connection to HBase servers.
> One challenge, discovered in troubleshooting HBASE-4052, is how we invalidate connection(s)
to server which gets restarted.
> There're at least two ways.
> 1. HConnectionManager utilizes background thread(s) to periodically perform validation
of connections in HBASE_INSTANCES and remove stale connection(s).
> 2. Allow HBaseClient (including HBaseAdmin) to provide feedback to HConnectionManager.
> The solution can be a combination of both of the above.

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