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https://issues.apache.org/jira/browse/CASSANDRA-799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12835180#action_12835180
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Hudson commented on CASSANDRA-799:
----------------------------------
Integrated in Cassandra #360 (See
[http://hudson.zones.apache.org/hudson/job/Cassandra/360/])
refactor to make memtablesPendingFlush a member variable instead of a
static, and Memtable to have a reference to CFS instead of table/cfname pair.
patch by jbellis; reviewed by Stu Hood for
use a sorted map for memtable contents to make range queries not have to sort
every time
patch by jbellis; reviewed by Stu Hood for
refactor IFlushable contract to push differences b/t Mt and BMT into their
respective classes
patch by jbellis; reviewed by Stu Hood for
> memtable sort is the bottleneck for range query performance
> -----------------------------------------------------------
>
> Key: CASSANDRA-799
> URL: https://issues.apache.org/jira/browse/CASSANDRA-799
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Jonathan Ellis
> Priority: Minor
> Fix For: 0.6
>
> Attachments:
> 0001-refactor-IFlushable-contract-to-push-differences-b-t-M.txt,
> 0002-use-a-sorted-map-for-memtable-contents-to-make-range-q.txt,
> 0003-refactor-to-make-memtablesPendingFlush-a-member-variab.txt,
> 799-example.diff, 799-unbounded-flushwriter.txt, 799.txt
>
>
> The obvious remedy is to use a sorted map. Unfortunately, keeping the map
> sorted constantly w/ TreeMap was about 30% slower than HashMap + sort back
> when we were doing manual locking. Let's see what the overhead is for
> ConcurrentSkiplistMap vs NBHM.
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