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From "Jonathan Ellis (Commented) (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-3624) Hinted Handoff - related OOM
Date Wed, 14 Dec 2011 03:38:30 GMT


Jonathan Ellis commented on CASSANDRA-3624:

That makes sense.  (How big are your mutations?)

We added adaptive page sizing back in CASSANDRA-2652, but apparently removed it for the CASSANDRA-2045
> Hinted Handoff - related OOM
> ----------------------------
>                 Key: CASSANDRA-3624
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Marcus Eriksson
> One of our nodes had collected alot of hints for another node, so when the dead node
came back and the row mutations were read back from disk, the node died with an OOM-exception
(and kept dying after restart, even with increased heap (from 8G to 12G)). The heap dump contained
alot of SuperColumns and our application does not use those (but HH does). 
> I'm guessing that each mutation is big so that PAGE_SIZE*<mutation_size> does not
fit in memory (will check this tomorrow)
> A simple fix (if my assumption above is correct) would be to reduce the PAGE_SIZE in to something like 10 (or even 1?) to reduce the memory pressure.
The performance hit would be small since we are doing the hinted handoff throttle delay sleep
before sending every *mutation* anyway (not every page), thoughts?
> If anyone runs in to the same problem, I got the node started again by simply removing
the HintsColumnFamily* files.

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