[HBASE-803] Atomic increment operations

• Type: New Feature
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.19.0
• Fix Version/s: 0.19.1, 0.20.0
• Component/s: Client, IPC/RPC, regionserver
• Assignee: ryan rawson
• Reporter: Jonathan Gray
• Created: 08/Aug/08 17:37
• Updated: 13/Sep/09 22:24
• Resolved: 25/Mar/09 09:38

Description

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

Issue Links

• depends upon: HBASE-798 Provide Client API to explicitly lock and unlock rows
• relates to: HBASE-493 Write-If-Not-Modified-Since support