The picture either too small or too pixelated for my eyes :-) Can you login to the box and send the output of top? If the system is unresponsive, it has to be something more than an unbalanced hdfs cluster, methinks.
Raj >________________________________ > From: Darrell Taylor <darrell.tay...@gmail.com> >To: common-user@hadoop.apache.org; Raj Vishwanathan <rajv...@yahoo.com> >Sent: Wednesday, May 9, 2012 2:40 PM >Subject: Re: High load on datanode startup > >On Wed, May 9, 2012 at 10:23 PM, Raj Vishwanathan <rajv...@yahoo.com> wrote: > >> When you say 'load', what do you mean? CPU load or something else? >> > >I mean in the unix sense of load average, i.e. top would show a load of >(currently) 376. > >Looking at Ganglia stats for the box it's not CPU load as such, the graphs >shows actual CPU usage as 30%, but the number of running processes is >simply growing in a linear manner - screen shot of ganglia page here : > >https://picasaweb.google.com/lh/photo/Q0uFSzyLiriDuDnvyRUikXVR0iWwMibMfH0upnTwi28?feat=directlink > > > >> >> Raj >> >> >> >> >________________________________ >> > From: Darrell Taylor <darrell.tay...@gmail.com> >> >To: common-user@hadoop.apache.org >> >Sent: Wednesday, May 9, 2012 9:52 AM >> >Subject: High load on datanode startup >> > >> >Hi, >> > >> >I wonder if someone could give some pointers with a problem I'm having? >> > >> >I have a 7 machine cluster setup for testing and we have been pouring data >> >into it for a week without issue, have learnt several thing along the way >> >and solved all the problems up to now by searching online, but now I'm >> >stuck. One of the data nodes decided to have a load of 70+ this morning, >> >stopping datanode and tasktracker brought it back to normal, but every >> time >> >I start the datanode again the load shoots through the roof, and all I get >> >in the logs is : >> > >> >STARTUP_MSG: Starting DataNode >> > >> > >> >STARTUP_MSG: host = pl464/10.20.16.64 >> > >> > >> >STARTUP_MSG: args = [] >> > >> > >> >STARTUP_MSG: version = 0.20.2-cdh3u3 >> > >> > >> >STARTUP_MSG: build = >> >> >file:///data/1/tmp/nightly_2012-03-20_13-13-48_3/hadoop-0.20-0.20.2+923.197-1~squeeze >> >-************************************************************/ >> > >> > >> >2012-05-09 16:12:05,925 INFO >> >org.apache.hadoop.security.UserGroupInformation: JAAS Configuration >> already >> >set up for Hadoop, not re-installing. >> > >> >2012-05-09 16:12:06,139 INFO >> >org.apache.hadoop.security.UserGroupInformation: JAAS Configuration >> already >> >set up for Hadoop, not re-installing. >> > >> >Nothing else. >> > >> >The load seems to max out only 1 of the CPUs, but the machine becomes >> >*very* unresponsive >> > >> >Anybody got any pointers of things I can try? >> > >> >Thanks >> >Darrell. >> > >> > >> > >> > > >
