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Posted to commits@cassandra.apache.org by "Brandon Williams (JIRA)" <ji...@apache.org> on 2010/10/14 19:48:34 UTC
[jira] Commented: (CASSANDRA-1007) Make memtable flush thresholds
per-CF instead of global
[ https://issues.apache.org/jira/browse/CASSANDRA-1007?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12921047#action_12921047 ]
Brandon Williams commented on CASSANDRA-1007:
---------------------------------------------
Tests fail to compile:
[javac] Compiling 80 source files to /srv/cassandra/build/test/classes
[javac] /srv/cassandra/test/unit/org/apache/cassandra/db/DefsTest.java:686: cannot find symbol
[javac] symbol : constructor CFMetaData(java.lang.String,java.lang.String,org.apache.cassandra.db.ColumnFamilyType,org.apache.cassandra.db.marshal.UTF8Type,<nulltype>,java.lang.String,int,boolean,double,int,int,org.apache.cassandra.db.marshal.BytesType,int,int,java.util.Map<byte[],org.apache.cassandra.config.ColumnDefinition>)
[javac] location: class org.apache.cassandra.config.CFMetaData
[javac] return new CFMetaData(ks,
[javac] ^
> Make memtable flush thresholds per-CF instead of global
> -------------------------------------------------------
>
> Key: CASSANDRA-1007
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1007
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Jonathan Ellis
> Assignee: Jon Hermes
> Priority: Minor
> Fix For: 0.7.0
>
> Attachments: 1007.txt
>
>
> This is particularly useful in the scenario where you have a few CFs with a high volume of overwrite operations; increasing the memtable size/op count means that you can do the overwrite in memory before it ever hits disk. Once on disk compaction is much more work for the system.
> But, you don't want to give _all_ your CFs that high of a threshold because the memory is better used elsewhere, and because it makes commitlog replay unnecessarily painful.
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