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Posted to commits@cassandra.apache.org by "Loic Lambiel (JIRA)" <ji...@apache.org> on 2016/11/11 14:49:00 UTC
[jira] [Commented] (CASSANDRA-9754) Make index info heap friendly
for large CQL partitions
[ https://issues.apache.org/jira/browse/CASSANDRA-9754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15657238#comment-15657238 ]
Loic Lambiel commented on CASSANDRA-9754:
-----------------------------------------
Any update on your ongoing tests [~mkjellman] ?
> 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: 0f8e28c220fd5af6c7b5dd2d3dab6936c4aa4b6b.patch, gc_collection_times_with_birch.png, gc_collection_times_without_birch.png, gc_counts_with_birch.png, gc_counts_without_birch.png, perf_cluster_1_with_birch_read_latency_and_counts.png, perf_cluster_1_with_birch_write_latency_and_counts.png, perf_cluster_2_with_birch_read_latency_and_counts.png, perf_cluster_2_with_birch_write_latency_and_counts.png, perf_cluster_3_without_birch_read_latency_and_counts.png, perf_cluster_3_without_birch_write_latency_and_counts.png
>
>
> 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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