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Posted to commits@cassandra.apache.org by "Carl Yeksigian (JIRA)" <ji...@apache.org> on 2013/05/07 18:39:16 UTC
[jira] [Updated] (CASSANDRA-4860) Estimated Row Cache Entry size
incorrect (always 24?)
[ https://issues.apache.org/jira/browse/CASSANDRA-4860?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Carl Yeksigian updated CASSANDRA-4860:
--------------------------------------
Attachment: 4860-tests.patch
Providing a couple of tests which show the broken byte buffer. Don't think that we should be comparing against the meter for these, but since it appears to be compared against that in the other parts, I followed the same specification.
> 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: 1.1.0, 1.2.3, 2.0
> Reporter: Chris Burroughs
> Assignee: Vijay
> Fix For: 1.2.0 beta 3
>
> Attachments: 0001-4860-v2.patch, 0001-4860-v3.patch, 0001-CASSANDRA-4860-for-11.patch, 0001-CASSANDRA-4860.patch, 4860-perf-test.zip, 4860-tests.patch, trunk-4860-revert.patch
>
>
> 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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