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 <jia...@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 > jia...@sdsc.edu > > >
