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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5902) Dealing with hints after a topology change
Date Fri, 19 Sep 2014 14:41:51 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14140659#comment-14140659
] 

Jonathan Ellis commented on CASSANDRA-5902:
-------------------------------------------

You're overcomplicating it.  There is no need to add more cognitive burden for operators.
 If you have so many hints that this is a problem, then it would be a problem with old behavior
too.  Either way you're going to want {{deleteHintsForEndpoint}} rather than restarting with
-D.

> Dealing with hints after a topology change
> ------------------------------------------
>
>                 Key: CASSANDRA-5902
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5902
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Jonathan Ellis
>            Assignee: Branimir Lambov
>            Priority: Minor
>             Fix For: 2.1.1
>
>
> Hints are stored and delivered by destination node id.  This allows them to survive IP
changes in the target, while making "scan all the hints for a given destination" an efficient
operation.  However, we do not detect and handle new node assuming responsibility for the
hinted row via bootstrap before it can be delivered.
> I think we have to take a performance hit in this case -- we need to deliver such a hint
to *all* replicas, since we don't know which is the "new" one.  This happens infrequently
enough, however -- requiring first the target node to be down to create the hint, then the
hint owner to be down long enough for the target to both recover and stream to a new node
-- that this should be okay.



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