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From "Brooke Bryan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-5367) Hints stuck on compaction
Date Wed, 20 Mar 2013 10:35:15 GMT
Brooke Bryan created CASSANDRA-5367:
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             Summary: Hints stuck on compaction
                 Key: CASSANDRA-5367
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5367
             Project: Cassandra
          Issue Type: Improvement
    Affects Versions: 1.2.2
         Environment: 80 Node cluster on 1.2.2 (problem has been around since before 1.0)
            Reporter: Brooke Bryan


When our cluster is handling hints, we will very often see hints get stuck on nodes if it
is unable to communicate with another node.  The problem is not that the other node is down,
the other node will be sat doing compactions, or running out of memory.  While that node is
a problem, and needs to be fixed, all other nodes on the cluster will stick waiting to handle
hints between that node and itself.

This causes a pretty major knock on effect throughout the entire cluster, causing hints to
back up.  We are seeing some nodes backed up with 14GB of hints, after 2 days of the hints
being stuck.

Also, during this "stuck" session, compactionstats will show a compaction on the system hints
column family, and not change the completed bytes amount.

This is the only reason for an entire cluster to get very bogged down from what I have experienced,
and requires a lot of manual intervention to get everything back online.

After putting a node into debug mode, I have narrowed down the issue to be within:

startColumn = hint.name(); (line ~361 HintedHandoffManager) and line 390

based on the log output, and through pausing handoffs etc.

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