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Date: Wed, 9 Nov 2011 12:52:59 +0000 (UTC)
From: "Brandon Williams (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (CASSANDRA-3466) Hinted handoff not working
 after rolling upgrade from 0.8.7 to 1.0.2
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    [ https://issues.apache.org/jira/browse/CASSANDRA-3466?page=3Dcom.atlas=
sian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D=
13147007#comment-13147007 ]=20

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-o=
p 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.
               =20
> 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 Borgstr=C3=B6m
>            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 n=
odes once they rejoin the ring. They only way I've found to get a node to d=
eliver 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=20
> 4. Insert data into bar and verify that HintsColumnFamily on node2 contai=
ns hints
> 5. Start node2 and verify that hinted handoff is performed and HintsColum=
nFamily becomes empty again.
> 6. Upgrade and restart node1
> 7. Shutdown node2=20
> 8. Insert data into bar and verify that HintsColumnFamily on node2 contai=
ns 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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