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From "Jonathan Ellis (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2893) Add row-level isolation
Date Wed, 16 Nov 2011 13:57:52 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13151206#comment-13151206
] 

Jonathan Ellis commented on CASSANDRA-2893:
-------------------------------------------

SnapTree License looks like standard bsd-with-attribution, which is ASL-compatible.
                
> 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.patch, 0002-Make-memtable-use-CF.addAll.patch,
0003-Add-AtomicSortedColumn-and-snapTree.patch, 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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