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