MAPREDUCE-2450 introduced, or at least triggers, a significant performance regression in Hive. With MR-2450 the execution time of TestCliDriver.skewjoin goes from 2 minutes to 15 minutes. Reverting this change from the build fixes the issue.
Here's the relevant query:
You can reproduce this by running the following from Hive 8.0 against Hadoop built from branch-23.
|Summary||MR-2450 introduced a significant performance regression||MR-2450 introduced a significant performance regression (Hive)|
|Priority||Blocker [ 1 ]||Major [ 3 ]|
|Target Version/s||0.23.1 [ 12318883 ]||2.0.0, 3.0.0 [ 12320354, 12320355 ]|