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From Roberto Bentivoglio <>
Subject Problem about freeing space after a major compaction
Date Mon, 28 Mar 2011 14:40:10 GMT
Hi all,
we're working on a Cassandra 0.7.0 production enviroment with a store of
data near to 500 GB.
We need to periodically remove the tombstones from deleted/expired data
performing a major compaction operation through nodetool.
After invoking the compaction on a single column family we can see from
JConsole that the LiveSSTableCount is going from 15 to 3 while the
LiveDiskSpaceUsed is going from 90GB to 50GB.
The problem now is that the space on the file system is been taken from
Cassandra (I assumed from the old SSTable) and it isn't freed. We have tried
to perform a full GC from the JConsole as described in without any success. The
space is freed only after a database restart.

How can we free this disk space without restart the db?

Thanks you very much,
Roberto Bentivoglio

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