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https://issues.apache.org/jira/browse/HADOOP-4207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12632665#action_12632665
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dhruba borthakur commented on HADOOP-4207:
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The hive metastore code talks SQL to store the data in the db. Apache Derby is
packaged into the Hadoop distribution to serve as a simple easy-to-use and
lightweight SQL store. In production, people might actually use mySQL or
something else instead of Derby.
> update derby.jar to eliminate the one time wait of 2-3 minutes while running
> junit tests
> ----------------------------------------------------------------------------------------
>
> Key: HADOOP-4207
> URL: https://issues.apache.org/jira/browse/HADOOP-4207
> Project: Hadoop Core
> Issue Type: Bug
> Components: contrib/hive
> Affects Versions: 0.19.0
> Reporter: Prasad Chakka
> Assignee: Prasad Chakka
> Priority: Minor
> Fix For: 0.19.0
>
> Attachments: derby.jar
>
>
> current derby.jar (version 10.4.1) has a bug where getting metadata of tables
> can hang upto few minutes. Hive metastore validates the existing tables &
> metadata while connecting and it can encounter this bug sometimes. The new
> version of derby.jar has a fix for this bug which would eliminate this hang.
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