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From "Ran Tavory (JIRA)" <j...@apache.org>
Subject [jira] Created: (CASSANDRA-1129) Using KeysCached="xx%" results in Key cache capacity: 1
Date Tue, 25 May 2010 17:23:24 GMT
Using KeysCached="xx%" results in Key cache capacity: 1
-------------------------------------------------------

                 Key: CASSANDRA-1129
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1129
             Project: Cassandra
          Issue Type: Bug
          Components: Core
    Affects Versions: 0.6.1
            Reporter: Ran Tavory
            Priority: Minor


I don't know if this is a general bug or only something related to my instance, but for me
(v0.6.1) I've noticed that when defining KeysCached="50%" (or KeysCached="100%" and I didn't
test other values with %) then cfstats reports Key cache capacity: 1

      <ColumnFamily CompareWith="BytesType" Name="KvAds"
        KeysCached="100%"
        RowsCached="10000"
        />


                Column Family: KvAds
                SSTable count: 7
                Space used (live): 797535964
                Space used (total): 797535964
                Memtable Columns Count: 42292
                Memtable Data Size: 10514176
                Memtable Switch Count: 24
                Read Count: 2563704
                Read Latency: 4.590 ms.
                Write Count: 1963804
                Write Latency: 0.025 ms.
                Pending Tasks: 0
                Key cache capacity: 1
                Key cache size: 1
                Key cache hit rate: 0.0
                Row cache capacity: 10000
                Row cache size: 10000
                Row cache hit rate: 0.2206178354382234
                Compacted row minimum size: 386
                Compacted row maximum size: 9808
                Compacted row mean size: 616

I'll attach one of the sstable files from this CF

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