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From "Oleg Anastasyev (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-5554) Growing pending compactions
Date Fri, 10 May 2013 06:43:16 GMT


Oleg Anastasyev updated CASSANDRA-5554:

    Attachment: patch.diff
> Growing pending compactions
> ---------------------------
>                 Key: CASSANDRA-5554
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.2.4
>            Reporter: Oleg Anastasyev
>         Attachments: patch.diff, pending_compactions_fixed.png
> I noticed on one of our new cassandra production server, that "pending compactions" number
is steadily growing. The cluster is under low write load, so "compactions are not keeping
up" is not the case.
> A quick investigation shown, that compactions are stopping far before all pending tasks
are completed. I also found, that if concurrent_compactors=1, background compactions are not
happening at all.
> The bug is in BackgroundCompactionTask rescheduling logic. The executor pool "room control"
code in CompactionManager.submitBackground() does not reschedule next background cycle, if
executor.getActiveCount reach maximun pool size, so it is lost forever.
> So I patched it to always schedules single background cycle.

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