[
https://issues.apache.org/jira/browse/HADOOP-9085?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13503010#comment-13503010
]
liaowenrui commented on HADOOP-9085:
------------------------------------
1.when stop namenode is success,we should be delete the namenode pid file.
2.when we start namenode,we should be ps,not use kill -0.
code in hadoop-daemo.sh
if [ -f $pid ]; then
if kill -0 `cat $pid` > /dev/null 2>&1; then
echo $command running as process `cat $pid`. Stop it first.
exit 1
fi
fi
we will change it like this:
if [ -f $pid ]; then
tmppid=`cat $pid`
curpid=`ps -ww -eo pid,user,euid,cmd | grep "org.apache.hadoop.hdfs." |
grep "$command" | grep $tmppid | grep -v "grep" | awk '{print $1}'`
if [ -n "$curpid" ]; then
echo $command running as process `cat $pid`. Stop it first.
exit 1
fi
fi
> 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: 2.0.1-alpha, 2.0.2-alpha, 2.0.3-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
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
