以EMR-2.0.1为例，对E-MapReduce的集群环境做个总结介绍

• E-MapReduce环境变量

登录集群，输入env 命令即可看到环境变量。跟hadoop相关的如下

JAVA_HOME=/usr/lib/jvm/java

HADOOP_HOME=/usr/lib/hadoop-current
HADOOP_CLASSPATH=/usr/lib/hbase-current/lib/*:/usr/lib/tez-current/*:/usr/lib/tez-current/lib/*:/etc/emr/tez-conf:/usr/lib/hbase-current/lib/*:/usr/lib/tez-current/*:/usr/lib/tez-current/lib/*:/etc/emr/tez-conf:/opt/apps/extra-jars/*:/opt/apps/extra-jars/*
HADOOP_CONF_DIR=/etc/emr/hadoop-conf

SPARK_HOME=/usr/lib/spark-current
SPARK_CONF_DIR=/etc/emr/spark-conf

HBASE_HOME=/usr/lib/hbase-current
HBASE_CONF_DIR=/etc/emr/hbase-conf

HIVE_HOME=/usr/lib/hive-current
HIVE_CONF_DIR=/etc/emr/hive-conf

PIG_HOME=/usr/lib/pig-current
PIG_CONF_DIR=/etc/emr/pig-conf

TEZ_HOME=/usr/lib/tez-current
TEZ_CONF_DIR=/etc/emr/tez-conf

ZEPPELIN_HOME=/usr/lib/zeppelin-current
ZEPPELIN_CONF_DIR=/etc/emr/zeppelin-conf

HUE_HOME=/usr/lib/hue-current
HUE_CONF_DIR=/etc/emr/hue-conf

PRESTO_HOME=/usr/lib/presto-current
PRESTO_CONF_DIR=/etc/emr/presot-conf

• E-MapReduce 应用启停
  • yarn

yarn的操作，都需要在hadoop账号下进行 su hadoop;

ResourceManager 

/usr/lib/hadoop-current/sbin/yarn-daemon.sh start|stop resourcemanager

NodeManager

/usr/lib/hadoop-current/sbin/yarn-daemon.sh start|stop nodemanager

JobHistoryServer

/usr/lib/hadoop-current/sbin/mr-jobhistory-daemon.sh start|stop historyserver

WebProxyServer

/usr/lib/hadoop-current/sbin/yarn-daemon.sh start|stop proxyserver

• • hdfs

hdfs的操作，都需要在hdfs账号下进行 su hdfs

NameNode

/usr/lib/hadoop-current/sbin/hadoop-daemon.sh start|stop namenode

DataNode

/usr/lib/hadoop-current/sbin/hadoop-daemon.sh start|stop datanode

• • hbase

hbase的操作，都需要在hdfs账号下进行 su hdfs

HMaster

/usr/lib/hbase-current/bin/hbase-daemon.sh start master

HRegionServer

/usr/lib/hbase-curren/bin/hbase-daemon.sh start regionserver

• • hive

hive的操作，都需要在hadoop账号下进行 su hadoop

MetaStore

HADOOP_HEAPSIZE=512 /usr/lib/hive-current/bin/hive --service metastore >/dev/null 2>&1 &

HiveServer2

HADOOP_HEAPSIZE=512 /usr/lib/hive-current/bin/hive --service hiveserver2 >/dev/null 2>&1 &

• • presto

presto 的操作，都需要在hdfs账号下进行 su hdfs

PrestoServer

master节点

/usr/lib/presto-current//bin/launcher --config=/usr/lib/presto-current/etc/worker-config.properties start|stop

worker节点

/usr/lib/presto-current//bin/launcher --config=/usr/lib/presto-current/etc/coordinator-config.properties start|stop

• 小技巧

当需要对worker节点做统一操作时，可以写脚本命令，一键轻松解决左右问题。在EMR集群中，master到所有worker节点在hadoop和hdfs账号下是ssh打通的。

例如 需要对所有worker节点的nodemanager做停止操作，假设有n个worker节点，则可以这样做

for i in `seq 1 2`;do ssh emr-worker-$i /usr/lib/hadoop-current/sbin/yarn-daemon.sh stop nodemanager;done