Its the problem of multiple versions of same jar. On Thu, Jul 21, 2011 at 5:15 PM, Steve Loughran <ste...@apache.org> wrote:
> On 20/07/11 07:16, Juwei Shi wrote: > >> Hi, >> >> We faced a problem of loading logging class when start the name node. It >> seems that hadoop can not find commons-logging-*.jar >> >> We have tried other commons-logging-1.0.4.jar and >> commons-logging-api-1.0.4.jar. It does not work! >> >> The following are error logs from starting console: >> >> > I'd drop the -api file as it isn't needed, and as you say, avoid duplicate > versions. Make sure that log4j is at the same point in the class hierarchy > too (e.g in hadoop/lib) > > to debug commons logging, tell it to log to stderr. It's useful in > emergencies > > -Dorg.apache.commons.logging.**diagnostics.dest=STDERR >
