Hadoop jps正确使用流程及报错处理

[root@hadoop000 ~]# jps
4868 DataNode
5062 SecondaryNameNode
5256 Jps
4717 NameNode
[root@hadoop000 ~]#  kill -9 $(pgrep -f hadoop-2.8.1)
[root@hadoop000 ~]# jps
4868 -- process information unavailable
5062 -- process information unavailable
4717 -- process information unavailable
5279 Jps
[root@hadoop000 ~]# ps -ef|grep 4868
root      5301  1630  0 14:39 pts/0    00:00:00 grep 4868
#进程不存在 可去/tmp/hsperfdata_hadoop文件夹删除残留文件
[root@hadoop000 ~]# cd /tmp/hsperfdata_hadoop/
[root@hadoop000 hsperfdata_hadoop]# ll
total 96
-rw------- 1 hadoop hadoop 32768 May 19 14:38 4717
-rw------- 1 hadoop hadoop 32768 May 19 14:38 4868
-rw------- 1 hadoop hadoop 32768 May 19 14:38 5062
[root@hadoop000 hsperfdata_hadoop]# rm *
rm: remove regular file `4717'? yes
rm: remove regular file `4868'? yes
rm: remove regular file `5062'? yes
#显示正确
[root@hadoop000 hsperfdata_hadoop]# jps
5304 Jps

#hadoop用户
[hadoop@hadoop000 hadoop-2.8.1]$ pwd
/opt/software/hadoop-2.8.1
[hadoop@hadoop000 hadoop-2.8.1]$ sbin/start-dfs.sh
[hadoop@hadoop000 hadoop-2.8.1]$ jps
10004 SecondaryNameNode
9655 NameNode
10219 Jps
9806 DataNode
#root用户
[root@hadoop000 ~]# jps
10004  -- process information unavailable
9655  -- process information unavailable
10187 Jps
9806  -- process information unavailable
[root@hadoop000 hsperfdata_hadoop]# ps -ef|grep 10004
hadoop   10004     1  3 15:07 ?        00:00:08 /usr/local/java1.8/bin/java -Dproc_secondarynamenode -Xmx1000m -Djava.net.preferIPv4Stack=true -Dhadoop.log.dir=/opt/software/hadoop-2.8.1/logs -Dhadoop.log.file=hadoop.log -Dhadoop.home.dir=/opt/software/hadoop-2.8.1 -Dhadoop.id.str=hadoop -Dhadoop.root.logger=INFO,console -Djava.library.path=/opt/software/hadoop-2.8.1/lib/native -Dhadoop.policy.file=hadoop-policy.xml -Djava.net.preferIPv4Stack=true -Djava.net.preferIPv4Stack=true -Djava.net.preferIPv4Stack=true -Dhadoop.log.dir=/opt/software/hadoop-2.8.1/logs -Dhadoop.log.file=hadoop-hadoop-secondarynamenode-hadoop000.log -Dhadoop.home.dir=/opt/software/hadoop-2.8.1 -Dhadoop.id.str=hadoop -Dhadoop.root.logger=INFO,RFA -Djava.library.path=/opt/software/hadoop-2.8.1/lib/native -Dhadoop.policy.file=hadoop-policy.xml -Djava.net.preferIPv4Stack=true -Dhadoop.security.logger=INFO,RFAS -Dhdfs.audit.logger=INFO,NullAppender -Dhadoop.security.logger=INFO,RFAS -Dhdfs.audit.logger=INFO,NullAppender -Dhadoop.security.logger=INFO,RFAS -Dhdfs.audit.logger=INFO,NullAppender -Dhadoop.security.logger=INFO,RFAS org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode
root     10256  7539  0 15:11 pts/3    00:00:00 grep 10004
##看到进程存在 请不要去/tmp目录下做删除操作 用su切换到hadoop用户下 jps即显示正常