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From "liaowenrui (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-9085) start namenode failure,bacause pid of namenode pid file is other process pid or thread id before start namenode
Date Fri, 23 Nov 2012 04:17:00 GMT
liaowenrui created HADOOP-9085:
----------------------------------

             Summary: start namenode failure,bacause pid of namenode pid file is other process
pid or thread id before start namenode
                 Key: HADOOP-9085
                 URL: https://issues.apache.org/jira/browse/HADOOP-9085
             Project: Hadoop Common
          Issue Type: Bug
          Components: bin
    Affects Versions: 2.0.1-alpha, 2.0.3-alpha
         Environment: NA
            Reporter: liaowenrui
             Fix For: 2.0.3-alpha, 2.0.2-alpha, 2.0.1-alpha


pid of namenode pid file is other process pid or thread id before start namenode,start namenode
will failure.because the pid of namenode pid file will be checked use kill -0 command before
start namenode in hadoop-daemo.sh script.when pid of namenode pid file is other process pid
or thread id,checkt is use kil -0 command,and the kill -0 will return success.it means the
namenode is runing.in really,namenode is not runing.

2338 is dead namenode pid 
2305 is datanode pid

cqn2:/tmp # kill -0 2338
cqn2:/tmp # ps -wweLo pid,ppid,tid | grep 2338
 2305     1  2338



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