Zoltan Borok-Nagy 03af0b2c8c IMPALA-10422: EXPLAIN statements leak ACID transactions and locks ...

Currently EXPLAIN statements might open ACID transactions and
create locks on ACID tables.

This is not necessary since we won't modify the table. But the
real problem is that these transactions and locks are leaked and
open forever. They are even getting heartbeated while the
coordinator is still running.

The solution is to not consume any ACID resources for EXPLAIN
statements.

Testing:
* Added EXPLAIN INSERT OVERWRITE in front of an actual INSERT OVERWRITE
  in an e2e test

Change-Id: I05113b1fd9a3eb2d0dd6cf723df916457f3fbf39
Reviewed-on: http://gerrit.cloudera.org:8080/16923
Reviewed-by: Csaba Ringhofer <csringhofer@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>

2021-01-05 21:31:05 +00:00

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