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From Amandeep Khurana <ama...@gmail.com>
Subject Re: ask help for hsql conflict problem.
Date Wed, 30 Sep 2009 00:24:02 GMT
What do you mean by your own java application? What are you trying to run?
Is it a Map Reduce job?

Secondly, hadoop talks to a database only when you are trying to read/write
data during a job... There is nothing else that it does.

The connectors to interface with databases are DBInputFormat and


Amandeep Khurana
Computer Science Graduate Student
University of California, Santa Cruz

On Tue, Sep 29, 2009 at 4:58 PM, Jianwu Wang <jianwu@sdsc.edu> wrote:

> Hi there,
>   When I have hadoop running (version 0.20.0, Pseudo-Distributed Mode), I
> can not start my own java application. The exception complains that
> 'java.sql.SQLException: failed to connect to url
> "jdbc:hsqldb:hsql://localhost/hsqldb". I have to stop hadoop to start my own
> java application. Both my application and hadoop use hsqldb. Does anyone
> know why and can help me out of this problem?  Or tell me where to look for
> hadoop hsqldb connection implementation, like which kind of hsql server mode
> is used in hadoop and what is the default url of hsqldb for hadoop? I looked
> into org.apache.hadoop.mapred.lib.db package but didn't find any clue.
>   Thanks in advance!
> --
> Best wishes
> Sincerely yours
> Jianwu Wang
> jianwu@sdsc.edu

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