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From "ryan rawson (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-2856) TestAcidGuarantee broken on trunk
Date Tue, 20 Jul 2010 19:28:49 GMT
TestAcidGuarantee broken on trunk 

                 Key: HBASE-2856
                 URL: https://issues.apache.org/jira/browse/HBASE-2856
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.89.20100621
            Reporter: ryan rawson
             Fix For: 0.90.0

TestAcidGuarantee has a test whereby it attempts to read a number of columns from a row, and
every so often the first column of N is different, when it should be the same.  This is a
bug deep inside the scanner whereby the first peek() of a row is done at time T then the rest
of the read is done at T+1 after a flush, thus the memstoreTS data is lost, and previously
'uncommitted' data becomes committed and flushed to disk.

One possible solution is to introduce the memstoreTS (or similarly equivalent value) to the
HFile thus allowing us to preserve read consistency past flushes.  Another solution involves
fixing the scanners so that peek() is not destructive (and thus might return different things
at different times alas).

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