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From "Brandon Williams (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3466) Hinted handoff not working after rolling upgrade from 0.8.7 to 1.0.2
Date Wed, 09 Nov 2011 12:52:59 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13147007#comment-13147007
] 

Brandon Williams commented on CASSANDRA-3466:
---------------------------------------------

I haven't been able to reproduce the assertion errors, but I did find what is preventing hint
delivery in some cases:

{noformat}
        if (hintStore.getSSTables().isEmpty())
            return; // nothing to do, don't confuse users by logging a no-op handoff
{noformat}

If you're testing with a small enough amount of hints that the hints table never flushes,
we never deliver the hints in the current memtable.
                
> Hinted handoff not working after rolling upgrade from 0.8.7 to 1.0.2
> --------------------------------------------------------------------
>
>                 Key: CASSANDRA-3466
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3466
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 1.0.0
>            Reporter: Jonas Borgström
>            Assignee: Brandon Williams
>              Labels: hintedhandoff
>             Fix For: 1.0.3
>
>
> While testing rolling upgrades from 0.8.7 to 1.0.2 on a test cluster I've noticed that
hinted hand-off didn't always work properly. Hints generated on an upgraded node does not
seem to be delivered to other newly upgraded nodes once they rejoin the ring. They only way
I've found to get a node to deliver its hints is to restart it.
> Here's some steps to reproduce this issue:
> 1. Install cassandra 0.8.7 on node1 and node2 using default settings.
> 2. Create keyspace foo with {replication_factor: 2}. Create column family bar
> 3. Shutdown node2 
> 4. Insert data into bar and verify that HintsColumnFamily on node2 contains hints
> 5. Start node2 and verify that hinted handoff is performed and HintsColumnFamily becomes
empty again.
> 6. Upgrade and restart node1
> 7. Shutdown node2 
> 8. Insert data into bar and verify that HintsColumnFamily on node2 contains hints
> 9. Upgrade and start node2
> 10. Notice that hinted handoff is *not* performed when "node2" comes back. (Only if node1
is restarted)

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