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Type:
Bug
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Status: Closed
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Priority:
Major - P3
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Resolution: Fixed
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Affects Version/s: None
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Fix Version/s: WT2.9.0
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Component/s: None
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Labels:None
In WT-2534 we spent a lot of time adding diagnostics to track down a bug found when porting to a system with a weaker memory model than x86.
It would be helpful to have the following simple test for lost updates, which I believe would have failed on the test system:
create a table with one record, value_format=q, initial value zero
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In N threads:
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count = 0
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while count < 1000:
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begin a transaction with isolation=snapshot
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read $value
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update with $value+1, rollback and continue on failure
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commit
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increment count
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Join all threads, verify that the value is 1000 * N.
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