TestAcidGuarantee broken on trunk
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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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