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From "Keith Turner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-3044) ConditionalMutation should support conditional updates
Date Tue, 05 Aug 2014 17:46:12 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14086530#comment-14086530
] 

Keith Turner commented on ACCUMULO-3044:
----------------------------------------

There is an unstated assumption in my previous comment.  In the examples CM1, CM2, and CM3
are all conditional mutations for the row R1.

> ConditionalMutation should support conditional updates
> ------------------------------------------------------
>
>                 Key: ACCUMULO-3044
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3044
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: client, tserver
>    Affects Versions: 1.6.0
>            Reporter: Ryan Leary
>
> Currently, the ConditionalMutation object operates on a single row, and applies updates
if and only if a set of Conditions are met. 
> A new type of ConditionalMutation which operates on a single row and applies an update
if and only if a set of Conditions for that particular update would be more flexible.
> This behavior is possible currently by creating a new ConditionalMutation for each update.
In the case where there are a large number of updates for a single row, however, there is
a steep penalty paid due to the row-level locking. Another acceptable solution to this ticket
would be optimizing the ConditionalWriter to apply multiple conditional mutations on the same
row within the same atomic lock. The order of execution would need to be guaranteed.
> The API would look something like:
> {code}
> ConditionalMutation cm = new ConditionalMutation(rowKey);
> cm.put(Iterable<Condition>, CF, CQ, CV, Val);
> {code}



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