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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4414) Ship the exact cause for timeout and unavailable exception back to the client
Date Thu, 05 Jul 2012 16:35:36 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13407251#comment-13407251
] 

Sylvain Lebresne commented on CASSANDRA-4414:
---------------------------------------------

I haven't checked but maybe thrift will gentle enough to allow adding optional fields to the
exceptions, which would be my preferred option. But yes, that is one of the reason why I've
targeted to 1.2, but don't take it at face value, it's not definitive. 
                
> Ship the exact cause for timeout and unavailable exception back to the client 
> ------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-4414
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4414
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Sylvain Lebresne
>             Fix For: 1.2
>
>
> Currently when a client gets a timeout exception, it doesn't know what happened. But
sever side we usually know a little more than that. For example, for 99% of the timeouts at
CL > ONE, we will have some replica that have acknowlege. I think it could be useful to
send that information to the client with the exception. That could help with monitoring, "post-mortem"
analysis and debugging.
> Unavailable exceptions could also ship which nodes were alive and which ones where not.

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