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From Robert Coli <>
Subject Re: OOM while performing major compaction
Date Thu, 27 Feb 2014 22:03:53 GMT
On Thu, Feb 27, 2014 at 11:09 AM, Nish garg <> wrote:

> I am having OOM during major compaction on one of the column family where
> there are lot of SStables (33000) to be compacted. Is there any other way
> for them to be compacted? Any help will be really appreciated.

You can use user defined compaction to reduce the working set, but only a
major compaction is capable of purging 100% of tombstones.

How much garbage is actually in the files? Why do you have 33,000 of them?
You mention a major compaction so you are likely not using LCS with the bad
5mb default... how did you end up with so many SSTables?

Have you removed the throttle from compaction, generally?

What version of Cassandra?


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