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. > > > > > > >
