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Date: Tue, 11 Oct 2016 17:37:20 +0000 (UTC)
From: "Branimir Lambov (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
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Subject: [jira] [Commented] (CASSANDRA-9754) Make index info heap friendly
 for large CQL partitions
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archived-at: Tue, 11 Oct 2016 17:37:22 -0000


    [ https://issues.apache.org/jira/browse/CASSANDRA-9754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15566048#comment-15566048 ] 

Branimir Lambov commented on CASSANDRA-9754:
--------------------------------------------

Is it now ready for review?

> Make index info heap friendly for large CQL partitions
> ------------------------------------------------------
>
>                 Key: CASSANDRA-9754
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9754
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: sankalp kohli
>            Assignee: Michael Kjellman
>            Priority: Minor
>             Fix For: 4.x
>
>         Attachments: 9754_part1-v1.diff, 9754_part2-v1.diff
>
>
>  Looking at a heap dump of 2.0 cluster, I found that majority of the objects are IndexInfo and its ByteBuffers. This is specially bad in endpoints with large CQL partitions. If a CQL partition is say 6,4GB, it will have 100K IndexInfo objects and 200K ByteBuffers. This will create a lot of churn for GC. Can this be improved by not creating so many objects?


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