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From Peter Schuller <>
Subject Re: Cassandra disk space utilization WAY higher than I would expect
Date Tue, 27 Jul 2010 17:26:48 GMT
> Minor compactions (see
> will try to keep the
> growth in check but it is by no means limited to 2x.

Sorry I was being unclear. I was rather thinking along the lines of a
doubling of data triggering an implicit major compaction. However I
was wrong anyway, since minimumCompactionThreshold in
CompactionManager is set to 4.

This does make me realize that the actual worst-case spike of disk
space usage is decidedly non-trivial to figure out, even if we are
allowed to assume that compaction speed is equal to or greater than
the speed of writes.

/ Peter Schuller

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