How many map/reduce slots are you running per TT? How much memory is available per node? Did you enable memory management? - See http://hadoop.apache.org/docs/stable/cluster_setup.html#Memory+monitoring
Thanks, +Vinod On Aug 14, 2013, at 6:34 PM, Chun-fan Ivan Liao wrote: > Hi, > > We are using Hadoop 1.0.3 on Ubuntu 12.04.2 LTS. Hadoop servers include 1 > NN/JT, 1 SNN/DN & several DNs. > > From time to time, some of the servers just hanged, cannot be pinged, screen > blackened out, not responding to keyboard input and lost connection with the > NN. Lately, one DN was hanged even when there is no job to run. Specifically, > the unresponsive happens not on all machines. It usually happens on several > specific DNs. > > How to tackle this problem? Does it leave a trace when the system > crashes/hangs? > > Any help would be greatly appreciated. > > -- CONFIDENTIALITY NOTICE NOTICE: This message is intended for the use of the individual or entity to which it is addressed and may contain information that is confidential, privileged and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, you are hereby notified that any printing, copying, dissemination, distribution, disclosure or forwarding of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and delete it from your system. Thank You.
