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Date: Thu, 22 Dec 2011 17:21:31 +0000 (UTC)
From: "Brandon Williams (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (CASSANDRA-2893) Add row-level isolation
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    [ https://issues.apache.org/jira/browse/CASSANDRA-2893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13174907#comment-13174907 ] 

Brandon Williams commented on CASSANDRA-2893:
---------------------------------------------

bq. Okay, so more accurately about 6% on uncontended and 50% on contended. Since the contended case is likely to be where people want the isolation, that seems reasonable.

+1 (though it's also important to remember this is in a local context; network latency makes these percentages lower in practice)
                
> Add row-level isolation
> -----------------------
>
>                 Key: CASSANDRA-2893
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2893
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jonathan Ellis
>            Assignee: Sylvain Lebresne
>            Priority: Minor
>             Fix For: 1.1
>
>         Attachments: 0001-Move-deletion-infos-into-ISortedColumns-v2.patch, 0001-Move-deletion-infos-into-ISortedColumns.patch, 0002-Make-memtable-use-CF.addAll-v2.patch, 0002-Make-memtable-use-CF.addAll.patch, 0003-Add-AtomicSortedColumn-and-snapTree-v2.patch, 0003-Add-AtomicSortedColumn-and-snapTree.patch, latency-plain.svg, latency.svg, snaptree-0.1-SNAPSHOT.jar
>
>
> This could be done using an the atomic ConcurrentMap operations from the Memtable and something like http://code.google.com/p/pcollections/ to replace the ConcurrentSkipListMap in ThreadSafeSortedColumns.  The trick is that pcollections does not provide a SortedMap, so we probably need to write our own.
> Googling [persistent sortedmap] I found http://code.google.com/p/actord/source/browse/trunk/actord/src/main/scala/ff/collection (in scala) and http://clojure.org/data_structures#Data Structures-Maps.

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