Actually I shouldn't have called it "runtime information". What I want to get is some values of variables in FileInputFormat.java when a MapReduce job is running, so I tried to print them into log file.
any idea in that case? On Sun, Jun 20, 2010 at 4:03 AM, Ted Yu <yuzhih...@gmail.com> wrote: > If you outline what runtime information you want to collect, other people > may be able to help you better. > > There're two ways to collect such data without modifying hadoop source > code: > through JMX metrics exposed by hadoop, such as HEAP_MEMORY_USED and > datanode.CAPACITY > through snmp metrics by using snmp4j > > On Fri, Jun 18, 2010 at 8:15 PM, elton sky <eltonsky9...@gmail.com> wrote: > > > Hello fellas, > > > > problem here. I am trying to get some runtime info in > FileInputFormat.java > > and I try to use LOG.info(). However it never seems write anything into > log > > file. I tried to grep the "logs" directory and could not find the info > > supposed to be printed out. > > > > Any idea on this? > > > > BTW, any other way I can use to debug like this? > > > > Regards, > > Elton > > >
