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From "Vijay (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5521) move IndexSummary off heap
Date Tue, 30 Apr 2013 07:52:15 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13645365#comment-13645365
] 

Vijay commented on CASSANDRA-5521:
----------------------------------

Pushed an update to https://github.com/Vijay2win/cassandra/commits/5521_v2

This update doesn't use int[] which v1 used, v2 uses kind of offheap index over index summary
which is stored at the beginning of the memory block... Moves index summary completely offheap...
:)

I was not able to see any difference in performance between trunk and v2 using stress tool.

Micro benchmark shows v2 is 6 seconds slower for 20 Bilion get's hence it is was not noticeable
in stress tool, but the real benefit is less pauses and more data a node can hold...
                
> move IndexSummary off heap
> --------------------------
>
>                 Key: CASSANDRA-5521
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5521
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Vijay
>             Fix For: 2.0
>
>
> IndexSummary can still use a lot of heap for narrow-row sstables.  (It can also contribute
to memory fragmentation because of the large arrays it creates.)

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