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From "Kannan Muthukkaruppan (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3276) delete followed by a put with the same timestamp
Date Wed, 24 Nov 2010 19:45:14 GMT
delete followed by a put with the same timestamp
------------------------------------------------

                 Key: HBASE-3276
                 URL: https://issues.apache.org/jira/browse/HBASE-3276
             Project: HBase
          Issue Type: Bug
            Reporter: Kannan Muthukkaruppan


[Note: This issue is relevant only for cases that don't use the default "time" based versions,
but provide/manage versions explicitly.]

The fix for HBASE-1485 ensures that if there are multiple puts with the same timestamp the
later one wins.

However, if there is a delete for a specific timestamp, then the later put doesn't win. 

Say for example the following is the sequence of operations:

put                         row/col/v1 - value1
deleteColumn     row/col/v1
put                         row/col/v1 - value2

Without the deleteColumn(), HBASE-1485 ensures that "value2" is the winner.

However, with the deleteColumn() thrown into the mix, the delete wins, and one cannot insert
a new value at that version. [The only, unsatisfactory, workaround at this point seems to
be trigger a major compaction. The major compact would clear the delete marker, and allow
new cells to be created with that version again.] 

---

Seems like it might not be too complicated to extend the fix for HBASE-1485 to also respect
ordering between delete/put operations. I'll look into this further.








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