Zhihua Deng created HIVE-26794:
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Summary: Explore changing TxnHandler#connPoolMutex to
NoPoolConnectionPool
Key: HIVE-26794
URL: https://issues.apache.org/jira/browse/HIVE-26794
Project: Hive
Issue Type: Improvement
Components: Standalone Metastore
Reporter: Zhihua Deng
Instead of creating a fixed size connection pool for TxnHandler#MutexAPI, the
pool can be assigned to NoPoolConnectionPool due to:
* TxnHandler#MutexAPI is primarily designed to provide coarse-grained mutex
support to maintenance tasks running inside the Metastore, these tasks are not
user faced;
* A fixed size connection pool as same as the pool used in ObjectStore is a
waste for other non leaders in the warehouse;
The NoPoolConnectionPool provides connection on demand, and TxnHandler#MutexAPI
only uses getConnection method to fetch a connection from the pool, so it's
doable to change the pool to NoPoolConnectionPool, this would make the HMS more
scaleable.
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