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From "Jon Hermes (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-1129) Using KeysCached="xx%" results in Key cache capacity: 1
Date Wed, 02 Jun 2010 00:51:43 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-1129?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jon Hermes updated CASSANDRA-1129:
----------------------------------

    Attachment: TOTRUNK-CASSANDRA1129.patch

Here's the patch for trunk.
The testconf.xml is now a testconf.yaml.
The test itself uses trunk-style clock, decorated keys.

io/SSTableTracker changes go to io/sstable/SSTableTracker.

The other changes patched easily.

> 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
>             Fix For: 0.6.3
>
>         Attachments: 0001-CASSANDRA1129.patch, 0002-CASSANDRA1129.patch, 0003-CASSANDRA1129.patch,
KvAds-84.zip, TOTRUNK-CASSANDRA1129.patch
>
>
> 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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