2. Stopping HDP Services

Before trying any upgrades or uninstalling software, stop all Hadoop services in the following order:

Nagios
Ganglia
Oozie
WebHCat
Hive Metastore
ZooKeeper
HBase
MapReduce
HDFS

Stop Nagios. On the Nagios host machine, execute the following command:
```
service nagios stop 
```
Stop Ganglia.
1. Execute this command on the Ganglia server host machine:
```
/etc/init.d/hdp-gmetad stop
```
2. Execute this command on all the nodes in your Hadoop cluster:
```
/etc/init.d/hdp-gmond stop
```
Stop Oozie. On the Oozie server host machine, execute the following command:
```
 sudo su -l oozie -c "cd $OOZIE_LOG_DIR/log; /usr/lib/oozie/bin/oozie-stop.sh" 
```
where:
- $OOZIE_USER is the Oozie Service user. For example, oozie
- $OOZIE_LOG_DIR is the directory where Oozie log files are stored (for example: /var/log/oozie).
Stop WebHCat. On the WebHCat host machine, execute the following command:
```
su -l $WEBHCAT_USER -c "/usr/lib/hcatalog/sbin/webhcat_server.sh  stop"
```
where:
- $WEBHCAT_USER is the WebHCat Service user. For example, hcat.
Stop Hive. On the Hive Metastore host machine and Hive Server2 host machine, execute the following command:
```
ps aux | awk '{print $1,$2}' | grep hive | awk '{print $2}' | xargs kill >/dev/null 2>&1  
```
This will stop Hive Metastore and HCatalog services.

Stop ZooKeeper. On the ZooKeeper host machine, execute the following command:

su - $ZOOKEEPER_USER -c "export ZOOCFGDIR=/etc/zookeeper/conf ; export ZOOCFG=zoo.cfg ;source /etc/zookeeper/conf/zookeeper-env.sh ; /usr/lib/zookeeper/bin/zkServer.sh stop"

where $ZOOKEEPER_USER is the ZooKeeper Service user. For example, zookeeper.

Stop HBase.

Execute these commands on all RegionServers:

su -l $HBASE_USER -c "/usr/lib/hbase/bin/hbase-daemon.sh --config /etc/hbase/conf stop regionserver"

Execute these commands on the HBase Master host machine:

su -l $HBASE_USER -c "/usr/lib/hbase/bin/hbase-daemon.sh --config /etc/hbase/conf stop master"

where $HBASE_USER is the HBase Service user. For example, hbase.

Stop MapReduce

Execute these commands on all TaskTrackers:

su -l $MAPRED_USER -c "/usr/lib/hadoop/bin/hadoop-daemon.sh --config /etc/hadoop/conf stop tasktracker"

Execute these commands on the JobTracker host machine:

su -l $MAPRED_USER -c "/usr/lib/hadoop/bin/hadoop-daemon.sh --config /etc/hadoop/conf stop historyserver"

Execute theses commands on the JobTracker host machine:

su -l $MAPRED_USER -c "/usr/lib/hadoop/bin/hadoop-daemon.sh --config /etc/hadoop/conf stop jobtracker"

where $MAPRED_USER is the MapReduce Service user. For example, mapred.

Stop HDFS

Execute these commands on all DataNodes:

su -l $HDFS_USER -c "/usr/lib/hadoop/bin/hadoop-daemon.sh --config /etc/hadoop/conf stop datanode"

Execute these commands on the Secondary NameNode host machine:

su -l $HDFS_USER -c "/usr/lib/hadoop/bin/hadoop-daemon.sh --config /etc/hadoop/conf stop secondarynamenode”

Execute these commands on the NameNode host machine:
```
su -l $HDFS_USER -c "/usr/lib/hadoop/bin/hadoop-daemon.sh --config /etc/hadoop/conf stop namenode"
```
where $HDFS_USER is the HDFS Service user. For example, hdfs.

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