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From "Peter Schuller (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3882) avoid distributed deadlock in migration stage
Date Thu, 10 May 2012 15:56:50 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13272435#comment-13272435
] 

Peter Schuller commented on CASSANDRA-3882:
-------------------------------------------

I'm not sure what your intention is with the quote. If you mean that it implies it's only
during bootstrap, it's because I was only considering bootstrap at the time and didn't think
far enough to realize this would be a problem in general for schema changes.

The empirical observation is that all nodes are stuck with lots of migrationstage pending,
schema requests time out, schema updates at CLI sit there forever, and it very very very slowly
recovers since each guy is waiting on RPC timeout (depending on said timeout).

jstacking shows waiting in the migration stage on that future, for a response.

                
> avoid distributed deadlock in migration stage
> ---------------------------------------------
>
>                 Key: CASSANDRA-3882
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3882
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Peter Schuller
>            Assignee: Peter Schuller
>         Attachments: CASSANDRA-3882-hack.txt
>
>
> This is follow-up work for the remainders of CASSANDRA-3832 which was only a partial
fix. The deadlock in the migration stage needs to be fixed, as it can cause bootstrap (at
least) to take potentially a very very long time to complete, and might also cause a lack
of schema propagation until otherwise "poked".

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