Thanks for your suggestions, James. I will try that. Tan -----Original Message----- From: James Seigel [mailto:ja...@tynt.com] Sent: Thursday, June 17, 2010 6:21 PM To: common-user@hadoop.apache.org Subject: Re: Hadoop JobTracker Hanging
Up the memory from the default to about 4x the default (heap setting). This should make it better I'd think! We'd been having the same issue...I believe this fixed it. James On 2010-06-17, at 3:00 PM, Li, Tan wrote: > Folks, > > I need some help on job tracker. > I am running a two hadoop clusters (with 30+ nodes) on Ubuntu. One is with > version 0.19.1 (apache) and the other one is with version 0.20. 1+169.68 > (Cloudera). > > I have the same problem with both the clusters: the job tracker hangs almost > once a day. > Symptom: The job tracker web page can not be loaded, the command "hadoop job > -list" hangs and jobtracker.log file stops being updated. > No useful information can I find in the job tracker log file. > The symptom is gone after I restart the job tracker and the cluster runs fine > for another 20+ hour period. And then the symptom comes back. > > I do not have serious problem with HDFS. > > Any ideas about the causes? Any configuration parameter that I can change to > reduce the chances of the problem? > Any tips for diagnosing and troubleshooting? > > Thanks! > > Tan > > >
