cravani opened a new pull request #3051:
URL: https://github.com/apache/hive/pull/3051
…lti-threaded
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### What changes were proposed in this pull request?
Make
[HiveMetaStoreChecker.checkTable](https://github.com/apache/hive/blob/master/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/HiveMetaStoreChecker.java#L299)
operation run with multi threaded plus allow user to configure number of
threads.
### Why are the changes needed?
Currently
[HiveMetaStoreChecker.checkTable](https://github.com/apache/hive/blob/master/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/HiveMetaStoreChecker.java#L299)
is implemented with serialized operation to check current partitions in a
table as part of MSCK operation, this can be run in parallel to improve the
overall performance for MSCK Repair table queries.
If the table has 1000s of partitions on Cloud Storage (S3), this operation
could take longer to run. Changing it to run multithreaded will improve
performance.
### Does this PR introduce _any_ user-facing change?
Yes, PR introduces new configuration property with no changes for user by
default.
Property:
hive.metastore.msck.fshandler.threads/metastore.msck.fshandler.threads which
defaults to 1 and that is current behavior, however based on user requirement
it can be configured at the service/session level.
### How was this patch tested?
For stability of the patch added new clientpositive test case ->
msck_repair_multi_thread.q
additionally the patch was tested manually in terms of performance.
i.e with 33k partitions without patch MSCK operation took 2000 seconds vs
with Patch 200 seconds.
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