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From "ryan rawson (JIRA)" <j...@apache.org>
Subject [jira] Reopened: (HBASE-803) Atomic increment operations
Date Sat, 21 Mar 2009 01:50:50 GMT

     [ https://issues.apache.org/jira/browse/HBASE-803?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

ryan rawson reopened HBASE-803:
-------------------------------


the server code crashes if you increment during a flush, with an exception "more than 1 value
from memcache.".  The solution is to only use the first value if there are more than 1 returned
- with the snapshot, it's possible to return 2 values during a flush.

> 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: 0.19.0
>            Reporter: Jonathan Gray
>            Assignee: ryan rawson
>            Priority: Minor
>             Fix For: 0.19.1, 0.20.0
>
>         Attachments: HBASE-803-crash-bug.patch, hbase-803-v1.patch, HBASE-803-v2.patch,
HBASE-803-v3-0.19.patch, HBASE-803-v3-0.20.patch, HBASE-803-v3.patch, HBASE-803.patch
>
>
> 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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