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From "Chris Burroughs (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-4860) Estimated Row Cache Entry size incorrect (always 24?)
Date Wed, 24 Oct 2012 22:12:11 GMT
Chris Burroughs created CASSANDRA-4860:
------------------------------------------

             Summary: Estimated Row Cache Entry size incorrect (always 24?)
                 Key: CASSANDRA-4860
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4860
             Project: Cassandra
          Issue Type: Bug
          Components: Core
    Affects Versions: 1.1.6
            Reporter: Chris Burroughs


After running for several hours the RowCacheSize was suspicious low (ie 70 something MB) 
I used  CASSANDRA-4859 to measure the size and number of entries on a node:

In [3]: 1560504./65021
Out[3]: 24.0

In [4]: 2149464./89561
Out[4]: 24.0

In [6]: 7216096./300785
Out[6]: 23.990877204647838


That's RowCacheSize/RowCacheNumEntires  .  Just to prove I don't have crazy small rows the
mean size of the row *keys* in the saved cache is 67 and Compacted row mean size: 355.  No
jamm errors in the log

Config notes:
row_cache_provider: ConcurrentLinkedHashCacheProvider
row_cache_size_in_mb: 2048

Version info:
 * C*: 1.1.6
 * centos 2.6.32-220.13.1.el6.x86_64
 * java 6u31 Java HotSpot(TM) 64-Bit Server VM (build 20.6-b01, mixed mode)

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