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From "Bryan Duxbury (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-506) When an exception has to escape ServerCallable due to exhausted retries, show all the exceptions that lead to this situation
Date Wed, 12 Mar 2008 00:42:46 GMT

     [ https://issues.apache.org/jira/browse/HBASE-506?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Bryan Duxbury updated HBASE-506:
--------------------------------

    Attachment: 506-0.1.patch

Here's a patch to add this functionality for 0.1. (Nearly the same patch would apply to trunk,
but let's see if this works first.)

> When an exception has to escape ServerCallable due to exhausted retries, show all the
exceptions that lead to this situation
> ----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-506
>                 URL: https://issues.apache.org/jira/browse/HBASE-506
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: client
>            Reporter: Bryan Duxbury
>             Fix For: 0.1.0, 0.2.0
>
>         Attachments: 506-0.1.patch
>
>
> Every so often, we find ourselves trying to debug a problem that happens in HTable where
we exhaust all our retries trying to contact the region server hosting the region we want
to operate on. Oftentimes the last exception that comes out is something like WrongRegionException,
which should just never be the case. 
> As a way to improve our debugging capabilities, when we decide to throw an exception
out of ServerCallable, let's show not just the last exception but all the exceptions that
caused all the retries in the first place. This will help us understand the sequence of events
that led to us running out of retries. 

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