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From "Prakash Khemani (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3396) getLastIncrement() can miss some key-values
Date Tue, 28 Dec 2010 17:48:45 GMT
getLastIncrement() can miss some key-values
-------------------------------------------

                 Key: HBASE-3396
                 URL: https://issues.apache.org/jira/browse/HBASE-3396
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.90.0
            Reporter: Prakash Khemani
            Assignee: Jonathan Gray


In getLastIncrement() there is an assumption that memstore only scan will never return multiple
versions of a kv

    // found everything we were looking for, done
    if (results.size() == expected) {
      return results;
    }


Based on this assumption the code does an early out after it finds the expected number of
key-value pairs in the memstore. But what if there were multiple versions of the same kv returned
by the memstore scan? I think it is possible when the memstore has a snapshot pending to be
written out. A version of the key can be returned each from the online and from the snapshot
memory.


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