启停HDFS服务

HDFS服务启停，下面脚本需要在master节点运行，切需要在hdfs账号下。su hdfs

启动HDFS

执行下面脚本

#!/bin/bash

worker_cnt=`cat /etc/hosts | grep emr-worker | grep cluster | wc -l`
master_cnt=1
ha_flag=`grep -r high_availability_enable=true /usr/local/emr/emr-bin/script/`
nn_file=/usr/local/emr/emr-bin/script/hdfs/pre_start.sh
dn_file=/usr/local/emr/emr-bin/script/hdfs/start_up.sh
if [[ ! -z $ha_flag ]];then
  master_cnt=2
  nn_file=/usr/local/emr/emr-bin/script/ha_hdfs/pre_start.sh
  dn_file=/usr/local/emr/emr-bin/script/ha_hdfs/start_up.sh
fi

nn_cmd="export app_yarn_home=/usr/lib/hadoop-current;"\ `cat $nn_file | grep -v 'echo' | grep 'start namenode' | head -n 1 | awk -F '"' '{print $2;}'`
dn_cmd="export app_yarn_home=/usr/lib/hadoop-current;"\ `cat $dn_file | grep -v 'echo' | grep 'start datanode' | head -n 1 | awk -F '"' '{print $2;}'`

#start namenode
for ((i=1; i<=$master_cnt; i++));
do
    echo master--$i
    echo "$nn_cmd"
    if [ $i -eq 2 ];then
        ssh emr-header-$i "/usr/lib/hadoop-current/bin/hdfs namenode -bootstrapStandby <<< N"
    fi
    ssh emr-header-$i "$nn_cmd"
done

# start datanode
for ((i=1; i<=$worker_cnt; i++));
do
    echo "$dn_cmd"
    ssh emr-worker-$i "$dn_cmd"
done

停止HDFS服务

执行下面脚本

#!/bin/bash

worker_cnt=`cat /etc/hosts | grep emr-worker | grep cluster | wc -l`
master_cnt=1
ha_flag=`grep -r high_availability_enable=true /usr/local/emr/emr-bin/script/`
if [[ ! -z $ha_flag ]];then
  master_cnt=2
fi

nn_cmd='/usr/lib/hadoop-current/sbin/hadoop-daemon.sh stop namenode'
dn_cmd='/usr/lib/hadoop-current/sbin/hadoop-daemon.sh stop datanode'

#stop namenode
for ((i=1; i<=$master_cnt; i++));
do
    ssh emr-header-$i "$nn_cmd"
done

# stop datanode
for ((i=1; i<=$worker_cnt; i++));
do
    ssh emr-worker-$i "$dn_cmd"
done

启停YARN服务

启停YARN服务，下面的脚本需要在master节点运行，且需要在hadoop账号下，su hadoop。

启动YARN服务

执行下面脚本

#!/bin/bash

worker_cnt=`cat /etc/hosts | grep emr-worker | grep cluster | wc -l`
master_cnt=1
ha_flag=`grep -r high_availability_enable=true /usr/local/emr/emr-bin/script/`
yarn_file=/usr/local/emr/emr-bin/script/yarn/start_up.sh
if [[ ! -z $ha_flag ]];then
  master_cnt=2
  yarn_file=/usr/local/emr/emr-bin/script/ha_yarn/start_up.sh
fi

rm_cmd="export app_yarn_home=/usr/lib/hadoop-current;"\ `cat $yarn_file | grep -v 'echo' | grep  'start resourcemanager' | head -n 1 | awk -F '"' '{print $2;}'`
nm_cmd="export app_yarn_home=/usr/lib/hadoop-current;"\ `cat $yarn_file | grep -v 'echo' | grep  'start nodemanager' | head -n 1 | awk -F '"' '{print $2;}'`

#start resourcemanager
for ((i=1; i<=$master_cnt; i++));
do
    ssh emr-header-$i "$rm_cmd"
done

# start nodemanager
for ((i=1; i<=$worker_cnt; i++));
do
    ssh emr-worker-$i "$nm_cmd"
done

停止YARN服务

执行下面脚本

#!/bin/bash

worker_cnt=`cat /etc/hosts | grep emr-worker | grep cluster | wc -l`
master_cnt=1
ha_flag=`grep -r high_availability_enable=true /usr/local/emr/emr-bin/script/`
if [[ ! -z $ha_flag ]];then
  master_cnt=2
fi

nn_cmd='/usr/lib/hadoop-current/sbin/hadoop-daemon.sh stop namenode'
dn_cmd='/usr/lib/hadoop-current/sbin/hadoop-daemon.sh stop datanode'

#stop resourcemanager
for ((i=1; i<=$master_cnt; i++));
do
    ssh emr-header-$i "$nn_cmd"
done

# stop nodemanager
for ((i=1; i<=$worker_cnt; i++));
do
    ssh emr-worker-$i "$dn_cmd"
done