[jira] [Issue Comment Edited] (CASSANDRA-2893) Add row-level isolation

["Jonathan Ellis (Issue Comment Edited) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-2893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13131593#comment-13131593 ] 

Jonathan Ellis edited comment on CASSANDRA-2893 at 10/20/11 1:06 PM:
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https://github.com/nbronson/snaptree boasts O(1) clone. (See also CASSANDRA-3389.)
                
      was (Author: jbellis):
    https://github.com/nbronson/snaptree boasts O(1) clone.
                  
> 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
>
> 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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