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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-803) Atomic increment operations
Date Fri, 08 Aug 2008 18:13:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12620998#action_12620998
] 

Jonathan Gray commented on HBASE-803:
-------------------------------------

Currently I am doing an actual byte increment.  I may actual do as you propose, passing a
modify method.  But for now I'm leaving as a straight byte-increment.  This includes adding
additional bytes if you overflow your array size.  I should have a patch up today so you can
see.

I completely agree that this functionality is probably too specialized for HTable api.  I'm
doing it for internal use and I know of at least one other person who wants similar behavior.
 So I figured I'd put it out there for others to see or use.

> Atomic increment operations
> ---------------------------
>
>                 Key: HBASE-803
>                 URL: https://issues.apache.org/jira/browse/HBASE-803
>             Project: Hadoop HBase
>          Issue Type: New Feature
>          Components: client, ipc, regionserver
>    Affects Versions: 0.2.0
>            Reporter: Jonathan Gray
>            Priority: Minor
>             Fix For: 0.2.1
>
>
> Discussion was already started in HBASE-798
> First version will contain to additional HTable methods:
> incrementColumnValue(table,row,family:column) -> Inserts a new version of the specified
column (which must already exist) with an incremented cell value.
> incrementFamilyColumn(table,row,family: ) -> Inserts a new column under the specified
family.  This assumes the family always contains only one column.  That column is read, incremented,
deleted, and a new column is inserted with the incremented column name.  The existing value
is re-inserted unchanged to the new column.
> I'm going to be making even more specialized versions of these for internal use (taking
apart byte[]'s, doing different bit/byte operations, and assorted munging...).  So if anyone
has any requests for other specialized versions, or more generic versions, please post them
here and I'd be more than happy to take a stab at them.
> Next week I will likely have a go at HBASE-493

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