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From "Konstantin Naryshkin" <konstant...@a-bb.net>
Subject Re: Column family has more SSTables than threshold but no minorcompaction is running
Date Tue, 20 Sep 2011 21:34:36 GMT
I believe that minor compactions work on tables of same or similar size, so as long as your
tables do not fall within a small range of each other in terms of size, Cassandra does not
see an opportunity to run a minor compaction.

----- Original Message -----
From: "myreasoner" <myreasoner@gmail.com>
To: cassandra-user@incubator.apache.org
Sent: Tuesday, September 20, 2011 2:30:26 PM
Subject: Column family has more SSTables than threshold but no minorcompaction is running

                Column Family: CF_1
                SSTable count: 249
                Space used (live): 15120496328
                Space used (total): 15120496328
                Number of Keys (estimate): 18860800
                Memtable Columns Count: 0
                Memtable Data Size: 0
                Memtable Switch Count: 2483
                Read Count: 442
                Read Latency: NaN ms.
                Write Count: 208741548
                Write Latency: NaN ms.
                Pending Tasks: 0
                Key cache capacity: 200000
                Key cache size: 2395
                Key cache hit rate: NaN
                Row cache capacity: 200000
                Row cache size: 221
                Row cache hit rate: NaN
                Compacted row minimum size: 104
                Compacted row maximum size: 73457
                Compacted row mean size: 394

Current compaction thresholds: min = 4,  max = 32

As shown above, the # of SStables exceeds the max, the node load is light
but it's not running minor compaction on this Column family.  I don't want
to run major compaction manually from time to time.  Is there anything I can
tune?

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