[HBASE-1703] ICVs across /during a flush can cause multiple keys with the same TS (bad)

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 0.20.0
• Fix Version/s: 0.20.0
• Assignee: ryan rawson
• Reporter: ryan rawson
• Created: 24/Jul/09 20:43
• Updated: 13/Sep/09 22:24
• Resolved: 28/Jul/09 08:51

Description

We noticed a bug whereby the value in a hbase ICV'ed counter was lower, and the bug turned out to be that during a flush, the ICV will grab the KeyValue from 'memcache' and reuse the timestamp... if we grab the KeyValue from the snapshot we end up with 2 key values, one in memcache, one in a hfile, both with the same timestamp, but one with a lower value than the other.

The fix is to not reuse timestamps if they come out of the snapshot.