Sergey Shelukhin created HIVE-18570:
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Summary: ACID IOW implemented using base may delete too much data
Key: HIVE-18570
URL: https://issues.apache.org/jira/browse/HIVE-18570
Project: Hive
Issue Type: Bug
Reporter: Sergey Shelukhin
Suppose we have a table with delta_0 insert data.
Txn 1 starts an insert into delta_1.
Txn 2 starts an IOW into base_2.
Txn 2 commits.
Txn 1 commits after txn 2 but its results would be invisible.
If we treat IOW foo like DELETE FROM foo (to reason about it w.r.t. ACID
semantics), it seems to me this sequence of events is only possible under
read-uncommitted isolation level (so, 2 deletes rows written by 1).
Under any other isolation level rows written by 1 must survive, or there must
be some lock based change in sequence or conflict.
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