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Date: Sat, 15 Sep 2012 19:58:07 +1100 (NCT)
From: "rohithsharma (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <394443919.83913.1347699487669.JavaMail.jiratomcat@arcas>
Subject: [jira] [Created] (HIVE-3469) When new hive cluster is started, hive
 jdbc client hangs.
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rohithsharma created HIVE-3469:
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             Summary: When new hive cluster is started, hive jdbc client hangs.
                 Key: HIVE-3469
                 URL: https://issues.apache.org/jira/browse/HIVE-3469
             Project: Hive
          Issue Type: Bug
          Components: Clients, Metastore, Thrift API
         Environment: Hadoop-2.0.1 + Hive-0.9.0
            Reporter: rohithsharma


The scenario is as follows  : 
For the new hive cluster , when multiple hive client is getting the connection for hive server , there are 3 problems in metastore , hive client.
1. Since the derby is booted at first connection,  multiple client try to create database.One of the client succeed and another one throw exception because of *unique primary constraint* in metatables.

2. Once the Runtime exception is throw, the hive client which is made connection request will hang forever.

3. Potentially "ConcurrentModificationException" is thrown by JDOQuery.

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