Write-If-Not-Modified-Since support
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Key: HBASE-493
URL: https://issues.apache.org/jira/browse/HBASE-493
Project: Hadoop HBase
Issue Type: New Feature
Components: client, io, regionserver
Affects Versions: 0.2.0
Reporter: Chris Richard
Write-If-Not-Modified-Since for optimistic concurrency control:
Client retrieves cell (or row) and stores timestamp.
Client writes to same cell (or row) and passes timestamp.
If the cell's (or row's) latest timestamp matches the passed timestamp, the
write succeeds. If the timestamps do not match, the write fails and the client
is notified. The client must re-retrieve the cell/row to get the latest
timestamp before attempting to write back.
This behavior would be optional, if the client doesn't pass a timestamp to the
write method no not-modified check will be enforced.
Note: requires HBASE-489 to be complete, in order for the client to be able to
access timestamp values.
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