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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6125) Race condition in Gossip propagation
Date Wed, 09 Oct 2013 15:28:43 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13790471#comment-13790471
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Brandon Williams commented on CASSANDRA-6125:
---------------------------------------------

Can you point me to a spot in code where step 5 happens?

> Race condition in Gossip propagation
> ------------------------------------
>
>                 Key: CASSANDRA-6125
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6125
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Sergio Bossa
>
> Gossip propagation has a race when concurrent VersionedValues are created and submitted/propagated,
causing some updates to be lost, even if happening on different ApplicationStatuses.
> That's what happens basically:
> 1) A new VersionedValue V1 is created with version X.
> 2) A new VersionedValue V2 is created with version Y = X + 1.
> 3) V2 is added to the endpoint state map and propagated.
> 4) Nodes register Y as max version seen.
> 5) At this point, V1 is added to the endpoint state map and propagated too.
> 6) V1 version is X < Y, so nodes do not ask for his value after digests.
> A possible solution would be to propagate/track per-ApplicationStatus versions, possibly
encoding them to avoid network overhead.



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