Ran a simple hive query (with tez) and "--hiveconf hive.tez.auto.reducer.parallelism=true" . This internally turns on tez's auto reduce parallelism.
- Job started off with 1009 reduce tasks
- Tez reduces the number of reducers to 253
- Job completes successfully, but TEZ UI shows 1009 as the number of reducers (and 253 tasks as successful tasks). This can be a little misleading.
I will attach the screenshots soon.