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https://issues.apache.org/jira/browse/CASSANDRA-1969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13002330#comment-13002330
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Vijay commented on CASSANDRA-1969:
----------------------------------
For single allocation thats true.... the following code works!... but wont our
byte[] within a column less than that? is this a real concern?
final int SIZE = 1024;
final int KBS = 1024 * 1024;
for (int i = 0; i < KBS; i++) {
ByteBuffer.allocateDirect(SIZE );
System.out.println("allocating: "+ i);
}
System.out.println("ok");
Thread.sleep(10000);
}
> Use BB for row cache - To Improve GC performance.
> -------------------------------------------------
>
> Key: CASSANDRA-1969
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1969
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Environment: Linux and Mac
> Reporter: Vijay
> Assignee: Vijay
> Priority: Minor
> Attachments: 0001-Config-1969.txt,
> 0001-introduce-ICache-InstrumentingCache-IRowCacheProvider.txt,
> 0002-Update_existing-1965.txt, 0002-implement-SerializingCache.txt,
> 0002-implement-SerializingCacheV2.txt, 0003-New_Cache_Providers-1969.txt,
> 0003-add-ICache.isCopying-method.txt, 0004-Null-Check-and-duplicate-bb.txt,
> 0004-TestCase-1969.txt, 1969-rollup-and-config.txt, BB_Cache-1945.png,
> JMX-Cache-1945.png, Old_Cahce-1945.png, POC-0001-Config-1945.txt,
> POC-0002-Update_existing-1945.txt, POC-0003-New_Cache_Providers-1945.txt
>
>
> Java BB.allocateDirect() will allocate native memory out of the JVM and will
> help reducing the GC pressure in the JVM with a large Cache.
> From some of the basic tests it shows around 50% improvement than doing a
> normal Object cache.
> In addition this patch provide the users an option to choose
> BB.allocateDirect or store everything in the heap.
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