deniskuzZ commented on code in PR #3817:
URL: https://github.com/apache/hive/pull/3817#discussion_r1055539543
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standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/datasource/HikariCPDataSourceProvider.java:
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@@ -72,6 +72,17 @@ public DataSource create(Configuration hdpConfig, int
maxPoolSize) throws SQLExc
config.setPoolName(poolName);
}
+ // It's kind of a waste to create a fixed size connection pool as same as
the TxnHandler#connPool,
+ // TxnHandler#connPoolMutex is mostly used for MutexAPI that is primarily
designed to
+ // provide coarse-grained mutex support to maintenance tasks running
inside the Metastore,
+ // add minimumIdle=2 and idleTimeout=5min to the pool, so that the
connection pool can retire
+ // the idle connection aggressively, this will make Metastore more
scalable especially if
+ // there is a leader in the warehouse.
+ if ("mutex".equals(poolName)) {
Review Comment:
Could we please extract the string literal into constants?
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