HDFS中pid文件存储在哪

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pid文件默认存储在/tmp目录中，pid文件的内容为进程号
    [hadoop@hadoop002 ~]$ cd /tmp
    [hadoop@hadoop002 tmp]$ pwd
    /tmp
    [hadoop@hadoop002 tmp]$ ll
    total 132
    drwxrwxr-x. 4 hadoop hadoop 4096 May 22 12:46 hadoop-hadoop
    -rw-rw-r--. 1 hadoop hadoop    5 May 23 11:00 hadoop-hadoop-datanode.pid
    -rw-rw-r--. 1 hadoop hadoop    5 May 23 11:00 hadoop-hadoop-namenode.pid
    -rw-rw-r--. 1 hadoop hadoop    5 May 23 11:00 hadoop-hadoop-secondarynamenode.pid
    drwxr-xr-x. 2 hadoop hadoop 4096 May 23 13:17 hsperfdata_hadoop
    drwxrwxr-x. 3 hadoop hadoop 4096 May 23 11:00 Jetty_0_0_0_0_50070_hdfs____w2cu08
    drwxrwxr-x. 4 hadoop hadoop 4096 May 23 11:05 Jetty_0_0_0_0_8042_node____19tj0x
    drwxrwxr-x. 3 hadoop hadoop 4096 May 23 11:01 Jetty_hadoop002_50090_secondary____.xoi5bj
    drwxrwxr-x. 4 hadoop hadoop 4096 May 23 11:05 Jetty_hadoop002_8088_cluster____jy43fd
    drwxrwxr-x. 3 hadoop hadoop 4096 May 22 12:43 Jetty_localhost_33164_datanode____.86mfre
    drwxrwxr-x. 3 hadoop hadoop 4096 May 21 16:31 Jetty_localhost_34452_datanode____57ccs7
    drwxrwxr-x. 3 hadoop hadoop 4096 May 22 13:28 Jetty_localhost_35801_datanode____1320ou
    drwxrwxr-x. 3 hadoop hadoop 4096 May 22 11:14 Jetty_localhost_41633_datanode____.reuty8
    drwxrwxr-x. 3 hadoop hadoop 4096 May 21 17:17 Jetty_localhost_43514_datanode____do382o
    drwxrwxr-x. 3 hadoop hadoop 4096 May 23 11:00 Jetty_localhost_54437_datanode____.slqxa8
    drwxrwxr-x. 3 hadoop hadoop 4096 May 22 12:24 Jetty_localhost_55741_datanode____.cj1ayt
    drwxrwxr-x. 3 hadoop hadoop 4096 May 22 12:18 Jetty_localhost_55901_datanode____.91pz3
    drwxrwxr-x. 3 hadoop hadoop 4096 May 22 13:36 Jetty_localhost_59457_datanode____.gif7tz
    drwxrwxr-x. 3 hadoop hadoop 4096 May 22 11:28 Jetty_localhost_59865_datanode____dj2ere
    drwx------. 2 root   root   4096 May 23 10:55 keyring-dOEsWO
    drwx------. 2 root   root   4096 Apr 21 02:20 keyring-fR5f6f
    drwx------. 2 root   root   4096 Apr 21 02:13 keyring-jZCkKD
    drwx------. 2 root   root   4096 Apr 20 20:07 keyring-RWPvsu
    drwx------. 2 root   root   4096 May 21 16:18 keyring-Rythlk
    drwx------. 2 root   root   4096 Apr 25 14:13 keyring-zrMZWC
    srwxrwxrwx. 1 mysql  Mysql     0 Apr 25 14:17 mysql.sock
    drwx------. 2 gdm    gdm    4096 May 23 10:55 orbit-gdm
    drwx------. 2 root   root   4096 May 23 10:56 orbit-root
    drwx------. 2 gdm    gdm    4096 May 23 10:56 pulse-aQWRK1os9K8n
    drwx------. 2 root   root   4096 May 23 10:55 pulse-Zd56fb7r0ESa
    drwx------. 2 root   root   4096 May 23 10:55 virtual-root.OV7MJo
    drwx------. 2 root   root   4096 May 21 16:18 virtual-root.q1Shey
    -rw-rw-r--. 1 hadoop hadoop    5 May 23 11:05 yarn-hadoop-nodemanager.pid
    -rw-rw-r--. 1 hadoop hadoop    5 May 23 11:05 yarn-hadoop-resourcemanager.pid
    [hadoop@hadoop002 tmp]$ 
    [hadoop@hadoop002 tmp]$ cat hadoop-hadoop-datanode.pid
    2619
    [hadoop@hadoop002 tmp]$ 

2.  修改HADOOP_PID_DIR文件的路径
    正常在生产上 pid文件是不能放在/tmp目录的，因为/tmp下面的pid文件一个月会自动删除一次。所以我们把tmp目录建在/data/hadoop目录下面：
    2.1 查看 /opt/software/hadoop/sbin/hadoop-daemon.sh 文件，发现hadoop查找pid是根据 HADOOP_PID_DIR 环境变量获取的。
        [hadoop@hadoop002 tmp]$ cat /opt/software/hadoop/sbin/hadoop-daemon.sh |grep pid
        #   HADOOP_PID_DIR   The pid files are stored. /tmp by default.
        pid=$HADOOP_PID_DIR/hadoop-$HADOOP_IDENT_STRING-$command.pid
            if [ -f $pid ]; then
              if kill -0 `cat $pid` > /dev/null 2>&1; then
                echo $command running as process `cat $pid`.  Stop it first.
            echo $! > $pid
            if [ -f $pid ]; then
              TARGET_PID=`cat $pid`
              rm -f $pid
        [hadoop@hadoop002 tmp]$ 
  2.2 以root创建/data/hadoop/tem 目录
        [hadoop@hadoop002 hadoop]$ exit   #退出hadoop
        loGout
        [root@hadoop002 software]# cd / 
        [root@hadoop002 /]#
        [root@hadoop002 /]# mkdir data
        [root@hadoop002 /]# cd data/
        [root@hadoop002 data]# mkdir hadoop
        [root@hadoop002 data]# cd hadoop/
        [root@hadoop002 hadoop]# mkdir tmp
        [root@hadoop002 hadoop]# ll
        total 4
        drwxr-xr-x. 2 root root 4096 May 23 14:11 tmp
    2.3  /data/hadoop/tem目录授权
        [root@hadoop002 hadoop]# chmod 777 tmp
        [root@hadoop002 hadoop]# ll
        total 4
        drwxrwxrwx. 2 root root 4096 May 23 14:11 tmp

   2.4 修改 /opt/software/hadoop/etc/hadoop/hadoop-env.sh文件里面HADOOP_PID_DIR的环境变量
        [hadoop@hadoop002 hadoop]$ pwd
       /opt/software/hadoop/etc/hadoop
        [hadoop@hadoop002 hadoop]$ vi hadoop-env.sh

        #export HADOOP_PID_DIR=${HADOOP_PID_DIR}  #注释这行
        export HADOOP_PID_DIR=/data/hadoop/tmp          #添加新路径
        编辑好后，保存退出。
   2.5 重启  sbin/start-dfs.sh
        #先停止hadoop服务
        [hadoop@hadoop002 sbin]$ sh stop-dfs.sh 
        Stopping namenodes on [hadoop002]
        hadoop002: no namenode to stop
        hadoop002: no datanode to stop
        Stopping secondary namenodes [hadoop002]
        hadoop002: no secondarynamenode to stop
        #再启动hadoop服务

        [hadoop@hadoop002 sbin]$ sh start-dfs.sh 
        Starting namenodes on [hadoop002]
        hadoop002: starting namenode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop-namenode-hadoop002.out
        hadoop002: starting datanode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop-datanode-hadoop002.out
        Starting secondary namenodes [hadoop002]
        hadoop002: starting secondarynamenode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop- secondarynamenode-hadoop002.out
        [hadoop@hadoop002 sbin]$ 

        #重启之前，tmp目录下没有文件
        [root@hadoop002 ~]# cd /data/hadoop/tmp/
        [root@hadoop002 tmp]# ll
        total 0
        #重启之后，tmp目录下生成了pid文件
        [root@hadoop002 tmp]# ll
        total 12
        -rw-rw-r--. 1 hadoop hadoop 5 May 23 14:17 hadoop-hadoop-datanode.pid
        -rw-rw-r--. 1 hadoop hadoop 5 May 23 14:17 hadoop-hadoop-namenode.pid
        -rw-rw-r--. 1 hadoop hadoop 5 May 23 14:17 hadoop-hadoop-secondarynamenode.pid

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