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From Sheng Chen <>
Subject Compaction doubles disk space
Date Tue, 29 Mar 2011 08:55:46 GMT
I use 'nodetool compact' command to start a compaction.
I can understand that extra disk spaces are required during the compaction,
but after the compaction, the extra spaces are not released.

Before compaction:
SSTable count: 10
space used (live): 19G
space used (total): 21G

After compaction:
sstable count: 1
space used (live): 19G
space used (total): 42G

BTW, given that compaction requires double disk spaces, does it mean that I
should never reach half of my total disk space?
e.g. if I have 505GB data on 1TB disk, I cannot even delete any data at all.

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