Oozie - EMR Development Guide| Alibaba Cloud Documentation Center

Oozie is an open source engine for big data workflow scheduling. It is used to schedule big data jobs and implement complex data production. This topic describes how to use Oozie in E-MapReduce (EMR).

Prerequisites

An EMR Hadoop cluster is created, and Oozie is selected from the optional services during the cluster creation. For more information, see Create a cluster.

Access the web UI of Oozie

You can use one of the following methods to access the web UI of Oozie:

Access the web UI of Oozie from the EMR console. For more information, see Access the web UIs of open source components.
Establish an SSH tunnel on the on-premises server and implement port forwarding to access the web UI of Oozie. For more information, see Create an SSH tunnel to access web UIs of open source components.

Submit a workflow job

By default, ShareLib is installed in EMR clusters. When you submit an Oozie workflow job, you do not need to install ShareLib.

In the job.properties file, specify NameNode and JobTracker (ResourceManager) based on the cluster type.
- Non-HA cluster
```
nameNode=hdfs://emr-header-1:9000
jobTracker=emr-header-1:8032
```
- HA cluster
```
nameNode=hdfs://emr-cluster
jobTracker=rm1,rm2
```
Submit an Oozie workflow job.
- Non-HA cluster
  1. Log on to the master node. For more information, see Connect to the master node of an EMR cluster in SSH mode.
```
ssh root@Public IP address of the master node
```
  2. Download sample code.
```
su oozie
cd /tmp
wget http://emr-sample-projects.oss-cn-hangzhou.aliyuncs.com/oozie-examples/oozie-examples.zip
unzip oozie-examples.zip
```
  3. Synchronize the Oozie workflow code to HDFS.
```
hadoop fs -copyFromLocal examples/ /user/oozie/examples
```
  4. Submit an Oozie workflow job.
```
$OOZIE_HOME/bin/oozie job -config examples/apps/map-reduce/job.properties -run
```
    If the command is successfully run, the following information is returned:
    job: 0000000-160627195651086-oozie-oozi-W
  5. Access the web UI of Oozie. For more information, see Access the web UI of Oozie.
    You can view the submitted Oozie workflow job.
- HA cluster
  1. Log on to the primary master node. For more information, see Connect to the master node of an EMR cluster in SSH mode.
```
ssh root@Public IP address of the primary master node
```
  2. Download sample code.
```
su oozie
cd /tmp
wget http://emr-sample-projects.oss-cn-hangzhou.aliyuncs.com/oozie-examples/oozie-examples-ha.zip
unzip oozie-examples-ha.zip
```
  3. Synchronize the Oozie workflow code to HDFS.
```
hadoop fs -copyFromLocal examples/ /user/oozie/examples
```
  4. Submit an Oozie workflow job.
```
$OOZIE_HOME/bin/oozie job -config examples/apps/map-reduce/job.properties -run
```
    If the command is successfully run, the following information is returned:
    job: 0000000-160627195651086-oozie-oozi-W
  5. Access the web UI of Oozie. For more information, see Access the web UI of Oozie.
    You can view the submitted Oozie workflow job.