[jira] [Created] (HIVE-26794) Explore changing TxnHandler#connPoolMutex to NoPoolConnectionPool

["Zhihua Deng (Jira)" <ji...@apache.org>]

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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