Zoltán Borók-Nagy created IMPALA-8788:
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Summary: Read globally consistent snapshot of ACID tables
Key: IMPALA-8788
URL: https://issues.apache.org/jira/browse/IMPALA-8788
Project: IMPALA
Issue Type: Improvement
Reporter: Zoltán Borók-Nagy
For ACID tables Impala fetches the valid write ids outside of a transaction.
This means that when a query refers to multiple ACID tables (e.g. doing a join)
the query might observe the modifications of the tables out of order.
E.g. let's suppose that the modification order is "write to A", then "write to
B", but Impala might see "write to B" without seeing "write to A".
Instead of that Impala should open a transaction and fetch the valid write ids
in the context of the opened transaction. This way Impala would see a
consistent global snapshot of all the tables.
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