sunchao commented on pull request #2647:
URL: https://github.com/apache/hive/pull/2647#issuecomment-926066475


   @szehon seems test failures are related:
   ```
   Caused by: 
org.apache.hive.com.zaxxer.hikari.pool.HikariPool$PoolInitializationException: 
Failed to initialize pool: FATAL: remaining connection slots are reserved for 
non-replication superuser connections
        at 
org.apache.hive.com.zaxxer.hikari.pool.HikariPool.throwPoolInitializationException(HikariPool.java:544)
 ~[hive-exec-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT]
        at 
org.apache.hive.com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:536)
 ~[hive-exec-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT]
        at 
org.apache.hive.com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:112) 
~[hive-exec-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT]
        at 
org.apache.hive.com.zaxxer.hikari.HikariDataSource.<init>(HikariDataSource.java:72)
 ~[hive-exec-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT]
        at 
org.apache.hadoop.hive.metastore.datasource.HikariCPDataSourceProvider.create(HikariCPDataSourceProvider.java:90)
 ~[hive-exec-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT]
        at 
org.apache.hadoop.hive.metastore.txn.TxnHandler.setupJdbcConnectionPool(TxnHandler.java:5571)
 ~[hive-exec-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT]
        at 
org.apache.hadoop.hive.metastore.txn.TxnHandler.init(TxnHandler.java:370) 
~[hive-exec-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT]
   ```


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