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From mcasandra <mohitanch...@gmail.com>
Subject Re: flush_largest_memtables_at messages in 7.4
Date Wed, 13 Apr 2011 00:16:44 GMT
One thing I am noticing is that cache hit rate is very low even though my
cache key size is 1M and I have less than 1M rows. Not sure why so many
cache miss?

Keyspace: StressKeyspace
        Read Count: 162506
        Read Latency: 45.22479006928975 ms.
        Write Count: 247180
        Write Latency: 0.011610943442026053 ms.
        Pending Tasks: 0
                Column Family: StressStandard
                SSTable count: 184
                Space used (live): 99616537894
                Space used (total): 99616537894
                Memtable Columns Count: 351
                Memtable Data Size: 171716049
                Memtable Switch Count: 543
                Read Count: 162507
                Read Latency: 317.892 ms.
                Write Count: 247180
                Write Latency: 0.006 ms.
                Pending Tasks: 0
                Key cache capacity: 1000000
                Key cache size: 256013
                Key cache hit rate: 0.33801452784503633
                Row cache: disabled
                Compacted row minimum size: 182786
                Compacted row maximum size: 5839588
                Compacted row mean size: 537470



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