[jira] [Created] (HIVE-5853) Hive Lock Manager leaks zookeeper connections

["Harel Ben Attia (JIRA)" <ji...@apache.org>]

Harel Ben Attia created HIVE-5853:
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             Summary: Hive Lock Manager leaks zookeeper connections
                 Key: HIVE-5853
                 URL: https://issues.apache.org/jira/browse/HIVE-5853
             Project: Hive
          Issue Type: Bug
    Affects Versions: 0.10.0
            Reporter: Harel Ben Attia


Hive 0.10 leaks zookeeper connections from ZooKeeperHiveLockManager. HIVE-3723 describes a similar issue for cases of semantic errors and failures, but we're experiencing a consistent connection leak per query (even simple successful queries like "select * from dual".

OS: CentOS 5.9
Hive version: hive-server-0.10.0+67-1.cdh4.2.0.p0.10.el5 and hive-0.10.0+198-1.cdh4.4.0.p0.15.el5
Hadoop version: CDH4.2
Namenode uses HA. Hive's zookeeper configuration uses the NN zookeeper.

The problem occurs both when using the python thrift API, and the java thrift API.

The leak happens even when we're running repeated "select * from dual" queries. We've checked the zookeeper connections using "netstat -n | grep 2181 | grep ESTAB | wc -l".

Eventually, the connection from the client reach the max connections per client limit in ZK, causing new queries to get stuck and never return.

We'll gladly provide more infromation if needed.








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