Start YARN/MapReduce Services

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	Note
	The `su` commands in this section use keywords to represent the Service user. For example, "hdfs" is used to represent the HDFS Service user. If you are using another name for your Service users, you need to substitute your Service user name in each of the `su` commands.

Application Timeline Server has changed. If you installed ATS with HDP 2.0, you need to add the following properties to yarn-site.xml to continue using ATS:

yarn.timeline-service.leveldb-timeline-store.path=/var/log/hadoop-yarn/timeline
yarn.timeline-service.leveldb-timeline-store.ttl-interval-ms=300000

** If you are upgrading to HDP 2.1.3 or higher, use the following setting: **
yarn.timeline-service.store-class=org.apache.hadoop.yarn.server.timeline.LeveldbTimelineStore

** If you are upgrading to HDP 2.1.2, use the following setting: **
yarn.timeline-service.store-class=org.apache.hadoop.yarn.server.applicationhistoryservice.timeline.LeveldbTimelineStore

yarn.timeline-service.ttl-enable=true
yarn.timeline-service.ttl-ms=2678400000
yarn.timeline-service.generic-application-history.store-class=org.apache.hadoop.yarn.server.applicationhistoryservice.NullApplicationHistoryStore
yarn.timeline-service.webapp.address={PUT_THE_FQDN_OF_ATS_HOST_NAME_HERE}:8188
yarn.timeline-service.webapp.https.address={PUT_THE_FQDN_OF_ATS_HOST_NAME_HERE}:8190
yarn.timeline-service.address={PUT_THE_FQDN_OF_ATS_HOST_NAME_HERE}:10200

Add the following properties to hive-site.xml:

hive.execution.engine=mr
hive.exec.failure.hooks=org.apache.hadoop.hive.ql.hooks.ATSHook
hive.exec.post.hooks=org.apache.hadoop.hive.ql.hooks.ATSHook
hive.exec.pre.hooks=org.apache.hadoop.hive.ql.hooks.ATSHook
hive.tez.container.size={map-container-size}

** If mapreduce.map.memory.mb > 2GB then set it equal to mapreduce.map.memory. 
Otherwise, set it equal to mapreduce.reduce.memory.mb **

hive.tez.java.opts=-server -Xmx800m -Djava.net.preferIPv4Stack=true -XX:NewRatio=8
-XX:+UseNUMA -XX:+UseParallelGC

Use configuration values appropriate for your environment. For example, the value "800" in the preceding example is an example, not a requirement.

To start YARN, run commands as a YARN user. To start MapReduce, run commands as a MapReduce user.

If you are using an HA enabled system, you must upgrade the ZooKeeper service and it must be running.
Start the ResourceManager on all your ResourceManager hosts.
su - yarn -c "/usr/hdp/current/hadoop-yarn-resourcemanager/sbin/yarn-daemon.sh start resourcemanager"
ps -ef | grep -i resourcemanager
Start the NodeManager on all your NodeManager hosts.
su - yarn -c "/usr/hdp/current/hadoop-yarn-nodemanager/sbin/yarn-daemon.sh start nodemanager"
ps -ef | grep -i nodemanager
To start MapReduce, run the following commands:
su - yarn -c "/usr/hdp/current/hadoop-mapreduce-historyserver/sbin/mr-jobhistory-daemon.sh
start historyserver"
ps -ef | grep -i jobhistoryserver

​Start YARN/MapReduce Services