cassandra-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Jon Hermes (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-1129) Using KeysCached="xx%" results in Key cache capacity: 1
Date Mon, 31 May 2010 07:28:36 GMT

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

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

    Attachment: 0002-CASSANDRA1129.patch

Removed the FBUtil change from patch.

setCapacity(int) changed to setCapacity(int,bool) in both interface and object.
The boolean in the object is now capacityFrozen with the same logic as before.
setCapacity from the automatic update (flushing/compaction) pass in a false to not freeze
the capacity afterward, setCapacity from the JMX command pass in a true to do so.

(To remedy a previous statement, the running time is not O(1) overall. It's O(|SSTables|)
with constant time per table.)

> 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, KvAds-84.zip
>
>
> 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

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message