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From "John Watson (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-4673) Compaction of HintsColumnFamily stucks
Date Tue, 09 Oct 2012 19:24:02 GMT


John Watson commented on CASSANDRA-4673:

We also experienced this issue on SSDs and after reading CASSANDRA-4492 and CASSANDRA-4182

Turned off {{multithread_compaction}} and this issue went away
> Compaction of HintsColumnFamily stucks
> --------------------------------------
>                 Key: CASSANDRA-4673
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 1.1.1
>         Environment: We've got a 24 nodes cluster with 3 virtual data centers. We've
got 7 nodes with SSD drives. We are operating under very heavy read/write load. We typically
seeing CPU usage >90% on our machines.
> We are using 1.1.2 - why this version is not listed in the 'Affected Version' drop down?
>            Reporter: Bartłomiej Romański
> On some nodes the compaction of HintsColumnFamily stucked. Here is a typical output of
'nodetool compactionstats':
> pending tasks: 1
>           compaction type        keyspace   column family bytes compacted     bytes total
>                Compaction          systemHintsColumnFamily       346205828       346909662
> Active compaction remaining time :   0h00m00s
> Rebooting a node does not help. The compaction starts immediately after booting and stucks
and the same point.
> If this can be related we are also expiring a problem described in CASSANDRA-4639.

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