Atomic Check And Save in HTable
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Key: HBASE-1090
URL: https://issues.apache.org/jira/browse/HBASE-1090
Project: Hadoop HBase
Issue Type: New Feature
Reporter: Michael Gottesman
Priority: Minor
Check And Save is a simple operation where one gives both a BatchUpdate with
updates and a Map mapping columns to expected values (byte[] -> byte[]). The
operation works as follows:
1. Server gets locks on row.
2. Server checks that the actual values of the specified columns match the
given expected values
3. If False, return False, if True update the row
4. Unlock row.
Pretty simple... but useful.
Included in the attached patch are the necessary updates for HTable,
HRegionServer, RegionServerInterface, and HRegion. I also added a small unit
test to HTable where the test checks that checkAndSave succeeds when the
expected values line up and fail when the values are different.
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