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From Jonathan Ellis <>
Subject Re: Compaction bringing a node to its knees
Date Sat, 29 May 2010 22:03:36 GMT
You could try setting the compaction thread to a lower priority.  You
could add a thread priority to NamedThreadPool, and pass that up from
CompactionExecutor constructor.  According to you have
to run as root and add a JVM option to get this to work.

On Sat, May 29, 2010 at 2:55 PM, James Golick <> wrote:
> I just experienced a compaction that brought a node to 100% of its IO
> capacity and made its responses incredibly slow.
> It wasn't enough to make the node actually appear as down, though, so it
> slowed down the operation of the cluster considerably.
> The CF being compacted contains a lot of relatively wide rows (hundreds of
> thousands or millions of columns on the big end). Is that the problem?
> Any suggestions on how to minimize impact here?

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

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