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https://issues.apache.org/jira/browse/HIVE-4132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13687981#comment-13687981
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Brock Noland commented on HIVE-4132:
------------------------------------
It's possible but I believe this one was more around the fact that there is no
pool of zookeeper connections. For example an HS2 with 500 concurrent users
will have 500 connections to zookeeper even though zk connections are used for
fairly short periods.
> Connection to Zookeeper is created for each client of HS2
> ---------------------------------------------------------
>
> Key: HIVE-4132
> URL: https://issues.apache.org/jira/browse/HIVE-4132
> Project: Hive
> Issue Type: Sub-task
> Components: Server Infrastructure
> Reporter: Brock Noland
> Labels: HiveServer2
>
> Currently when concurrency is enabled and HS2 is used each client will have a
> connection to Zookeeper. Zookeeper has a property, maxClientCnxns, in the
> zoo.cfg which limits the number of connections *per* host to a low number
> like 50. The stack trace of the threads accessing zookeeper is below for
> reference.
> {noformat}
> -
> org.apache.hadoop.hive.ql.lockmgr.zookeeper.ZooKeeperHiveLockManager.lock(java.util.List,
> boolean) @bci=94, line=220 (Interpreted frame)
> - org.apache.hadoop.hive.ql.Driver.acquireReadWriteLocks() @bci=428,
> line=834 (Interpreted frame)
> - org.apache.hadoop.hive.ql.Driver.run(java.lang.String) @bci=453, line=944
> (Interpreted frame)
> - org.apache.hive.service.cli.operation.SQLOperation.run() @bci=126, line=95
> (Interpreted frame)
> -
> org.apache.hive.service.cli.session.HiveSessionImpl.executeStatement(java.lang.String,
> java.util.Map) @bci=19, line=168 (Interpreted frame)
> -
> org.apache.hive.service.cli.CLIService.executeStatement(org.apache.hive.service.cli.SessionHandle,
> java.lang.String, java.util.Map) @bci=10, line=153 (Interpreted frame)
> -
> org.apache.hive.service.cli.thrift.ThriftCLIService.ExecuteStatement(org.apache.hive.service.cli.thrift.TExecuteStatementReq)
> @bci=41, line=190 (Interpreted frame)
> -
> org.apache.hive.service.cli.thrift.TCLIService$Processor$ExecuteStatement.getResult(org.apache.hive.service.cli.thrift.TCLIService$Iface,
> org.apache.hive.service.cli.thrift.TCLIService$ExecuteStatement_args)
> @bci=14, line=1133 (Interpreted frame)
> {noformat}
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