tree 977b245baee8672fa6da97a0e105bdcd527d0122
parent dbc69e9caeca49817937ae0c8d9e45e39f293c30
author Tim Armstrong <tarmstrong@cloudera.com> 1576545739 -0800
committer Impala Public Jenkins <impala-public-jenkins@cloudera.com> 1579299460 +0000

IMPALA-9197: make HashTable lookups thread-safe

This makes it possible to do HashTable lookups from
multiple threads without any data races. This
requires moving statistics that are updated during
probing to the HashTableCtx object.

There are some small changes to the hash table stat
logging behaviour as a result of the stats being moved
to the context. I don't believe these logs are used much,
if at all.

Testing:
Ran exhaustive tests.

Manually inspected some aggregation and join query profiles
to check that hash table stats looked reasonable.

Perf:
Ran TPC-H scale factor 30 on a single node. No significant
change in perf.

Change-Id: I92fbfa8cc000477b8e01975a102d818f9fa27c61
Reviewed-on: http://gerrit.cloudera.org:8080/14917
Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>