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From "Jianshi Huang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SPARK-4758) Make metastore_db in-memory for HiveContext
Date Fri, 05 Dec 2014 06:27:13 GMT
Jianshi Huang created SPARK-4758:
------------------------------------

             Summary: Make metastore_db in-memory for HiveContext
                 Key: SPARK-4758
                 URL: https://issues.apache.org/jira/browse/SPARK-4758
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 1.2.0, 1.3.0
            Reporter: Jianshi Huang
            Priority: Minor


HiveContext by default will create a local folder metastore_db.

This is not very user friendly as the metastore_db will be locked by HiveContext and thus
will block multiple Spark process to start from the same directory.

I would propose adding a default hive-site.xml in conf/ with the following content.

<configuration>

  <property>
    <name>javax.jdo.option.ConnectionURL</name>
    <value>jdbc:derby:memory:databaseName=metastore_db;create=true</value>
  </property>

  <property>
    <name>javax.jdo.option.ConnectionDriverName</name>
    <value>org.apache.derby.jdbc.EmbeddedDriver</value>
  </property>

  <property>
    <name>hive.metastore.warehouse.dir</name>
    <value>file://${user.dir}/hive/warehouse</value>
  </property>

</configuration>

jdbc:derby:memory:databaseName=metastore_db;create=true Will make sure the embedded derby
database is created in-memory.

Jianshi



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