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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4207) update derby.jar to eliminate the one time wait of 2-3 minutes while running junit tests
Date Fri, 19 Sep 2008 12:56:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12632665#action_12632665
] 

dhruba borthakur commented on HADOOP-4207:
------------------------------------------

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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