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From Jonathan Ellis <>
Subject Re: OOM during compaction with half the heap still available?
Date Fri, 25 Mar 2011 03:23:47 GMT
Have you run nodetool scrub?  The data versioning problem scrub fixes
can manifest itself as trying to read GB of data into memory during

On Thu, Mar 24, 2011 at 8:52 PM, Dan Washusen <> wrote:
> Hey All,
> I've noticed that the Cassandra instance I have running on our build machine
> occasionally crashes with an OOM error during compaction.  I'm going to dial
> down the memtable thresholds etc but I was wondering if anyone could help
> explain the heap usage at the time of the crash.  I just happened to leave a
> JMX console window open and it's showing that just before the crash roughly
> 50% of the heap was still available.
> Screenshot of heap usage:
> The above screenshot was taken a few weeks ago on Cassandra 0.7.2 (I think)
> with nmap disabled on Java 1.6.0_24-b07.  I'm now running 0.7.4 with nmap
> enabled and just got the same crash (based on the error message in the
> log)...
> Log snippet from crash that matches screenshot:
> Log snippet from 0.7.4 crash:
> Cheers,
> --
> Dan Washusen

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support

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