workflow decision example

decision-example.xml

<workflow-app xmlns = "uri:oozie:workflow:0.4" name = "simple-Workflow">
   <start to = "external_table_exists" />
   
   <decision name = "external_table_exists">
      <switch>
         <case to = "Create_External_Table">${fs:exists('/test/abc') eq 'false'}
            </case>
         <default to = "orc_table_exists" />
      </switch>
   </decision>

   <action name = "Create_External_Table">
      <hive xmlns = "uri:oozie:hive-action:0.4">
         <job-tracker>xyz.com:8088</job-tracker>
         <name-node>hdfs://rootname</name-node>
         <script>hdfs_path_of_script/external.hive</script>
      </hive>
		
      <ok to = "orc_table_exists" />
      <error to = "kill_job" />
   </action>
   
   <decision name = "orc_table_exists">
      <switch>
         <case to = "Create_orc_Table">
            ${fs:exists('/apps/hive/warehouse/orc_table') eq 'false'}</case>
         <default to = "Insert_into_Table" />
      </switch>
   </decision>
   
   <action name = "Create_orc_Table">
      <hive xmlns = "uri:oozie:hive-action:0.4">
         <job-tracker>xyz.com:8088</job-tracker>
         <name-node>hdfs://rootname</name-node>
         <script>hdfs_path_of_script/orc.hive</script>
      </hive>
		
      <ok to = "Insert_into_Table" />
      <error to = "kill_job" />
   </action>
   
   <action name = "Insert_into_Table">
      <hive xmlns = "uri:oozie:hive-action:0.4">
         <job-tracker>xyz.com:8088</job-tracker>
         <name-node>hdfs://rootname</name-node>
         <script>hdfs_path_of_script/Copydata.hive</script>
         <param>database_name</param>
      </hive>
		
      <ok to = "end" />
      <error to = "kill_job" />
   </action>
   
   <kill name = "kill_job">
      <message>Job failed</message>
   </kill>
	
   <end name = "end" />
	
</workflow-app>