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From Anthony Molinaro <>
Subject Compaction JMX Stats?
Date Thu, 20 May 2010 19:33:29 GMT

  In the 0.5.x series there was a COMPACTION-POOL which kept track of
in process, pending and completed compactions.  With 0.6.x this seems
to have vanished and instead we only have the CompactionManager PendingTasks
statistic.  Is there also a completed tasks somewhere?  Is there any
way to determine via nodetool if a compaction or anticompaction is occuring?
I'm trying to figure out the cause of random spikes in the Message Deserializer
Queue, and wanted to know if there was any correlation with compaction,
but with only PendingTasks, I would have to be sampling continuously to
catch it, as pending is mostly zero.

Are there other possible causes for a backup in Message Deserializer?
My traffic patterns are pretty constant, I don't see spikes in the
thread pool completed tasks, and often the rate is below the high water
mark for rates.



Anthony Molinaro                           <>

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