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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
DBOutputFormat.

-ak


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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