Sounds like your pid files are getting cleaned out of whatever directory they are being written (maybe garbage collection on a temp directory?).
Look at (taken from hadoop-env.sh): # The directory where pid files are stored. /tmp by default. # export HADOOP_PID_DIR=/var/hadoop/pids The hadoop shell scripts look in the directory that is defined. Bill -----Original Message----- From: Raymond Jennings III [mailto:raymondj...@yahoo.com] Sent: Monday, March 29, 2010 11:37 AM To: common-user@hadoop.apache.org Subject: why does 'jps' lose track of hadoop processes ? After running hadoop for some period of time, the command 'jps' fails to report any hadoop process on any node in the cluster. The processes are still running as can be seen with 'ps -ef|grep java' In addition, scripts like stop-dfs.sh and stop-mapred.sh no longer find the processes to stop.
