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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2449) Deprecate or modify per-cf memtable sizes in favor of the global threshold
Date Thu, 08 Sep 2011 04:25:09 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13099765#comment-13099765
] 

Hudson commented on CASSANDRA-2449:
-----------------------------------

Integrated in Cassandra #1087 (See [https://builds.apache.org/job/Cassandra/1087/])
    remove explicit per-CF memtable thresholds
patch by jbellis; reviewed by brandonwilliams for CASSANDRA-2449

jbellis : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1166520
Files : 
* /cassandra/trunk/NEWS.txt
* /cassandra/trunk/conf/cassandra.yaml
* /cassandra/trunk/interface/cassandra.thrift
* /cassandra/trunk/interface/thrift/gen-java/org/apache/cassandra/thrift/CfDef.java
* /cassandra/trunk/interface/thrift/gen-java/org/apache/cassandra/thrift/Constants.java
* /cassandra/trunk/src/avro/internode.genavro
* /cassandra/trunk/src/java/org/apache/cassandra/config/CFMetaData.java
* /cassandra/trunk/src/java/org/apache/cassandra/config/DatabaseDescriptor.java
* /cassandra/trunk/src/java/org/apache/cassandra/cql/CreateColumnFamilyStatement.java
* /cassandra/trunk/src/java/org/apache/cassandra/db/ColumnFamilyStore.java
* /cassandra/trunk/src/java/org/apache/cassandra/db/ColumnFamilyStoreMBean.java
* /cassandra/trunk/src/java/org/apache/cassandra/db/Memtable.java
* /cassandra/trunk/src/java/org/apache/cassandra/db/Table.java
* /cassandra/trunk/src/java/org/apache/cassandra/db/index/SecondaryIndex.java
* /cassandra/trunk/src/java/org/apache/cassandra/db/index/SecondaryIndexManager.java
* /cassandra/trunk/src/java/org/apache/cassandra/db/index/keys/KeysIndex.java
* /cassandra/trunk/src/java/org/apache/cassandra/service/StorageService.java
* /cassandra/trunk/test/unit/org/apache/cassandra/db/DefsTest.java


> Deprecate or modify per-cf memtable sizes in favor of the global threshold
> --------------------------------------------------------------------------
>
>                 Key: CASSANDRA-2449
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2449
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Stu Hood
>            Assignee: Jonathan Ellis
>             Fix For: 1.0
>
>         Attachments: 2449.txt
>
>
> The new memtable_total_space_in_mb setting is an excellent way to cap memory usage for
memtables, and one could argue that it should replace the per-cf memtable sizes entirely.
On the other hand, people may still want a knob to tune to flush certain cfs less frequently.
> I think a best of both worlds approach might be to deprecate the memtable_(throughput|operations)
settings, and replace them with a preference value, which controls the relative memory usage
of one CF versus another (all CFs at 1 would mean equal preference). For backwards compatibility,
we could continue to read from the _throughput value and treat it as the preference value,
while logging a warning.

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