liaowenrui created HADOOP-9085:
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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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