I always like to run the Apache Oozie Hive action sample to verify that the Hive action has been properly installed in the Oozie workflow scheduler. Shell 9. You might submit workflows against different clusters, or have different hive-defaults.xml on different clusters (e.g. Specify a start time and end time for the job using the code jobStart and jobEndvariables. When using Oozie Hive action, the hive-default.xml file must be copied to HDFS and in the Hive action configuration section it must be set in the oozie.hive.defaults property. Oozie coordinator jobs Invoke Oozie workflow jobs based on specified event triggers - date/time, data availability. Your email address will not be published. Objective. Oozie Workflow: Oozie workflow is DAG(Directed acyclic graph) contains collection of actions. If the input data is not available for a workflow run, the execution of the workflow job will be delayed until the input data becomes available. Oozie workflow jobs DAGS of actions which are jobs such as shell scripts, MapReduce, Sqoop, Streaming, Pipes, Pig, Hive etc. The and entities dictate the servers that the Hive job will connect to for executing its script. There are multiple ways to automate jobs, however, here we will work with Oozie. An Oozie workflow is a multistage Hadoop job. Java 7. An action does not start until the previous action in the workflow ends. The property values specified in the configuration element override values specified in the job-xml file. Notify me of follow-up comments by email. The actions are dependent on one another, as the next action can only be executed after the output of current action. Oozie Example: Hive Actions . Hive actions run a Hive query on the cluster. We have two map reduce actions which process the data and outputs the data into the hive table locations and two hive jobs to add partitions into the hive meta store. EL 2. Apache Hive - Hive joins, execution engines ... REST API concepts and examples ... 8:53. Apache Oozieis one of the workflow scheduler services/applications running on the Hadoop cluster. In this example, the Hive workflow of the previous example is configured to be executed on an hourly basis using the coord:hours(1) method. An Oozie workflow is a multistage Hadoop job. Oozie workflow incorporating a Hive job An action node represents a workflow task, e.g., moving files into HDFS, running a MapReduce, Pig or Hive jobs, importing data using Sqoop or running a shell script of a program written in Java. Users can specify symbolic links to files and archives using the # symbol in the workflow . Data Science Bootcamp with NIT KKRData Science MastersData AnalyticsUX & Visual Design, What is Data Analytics - Decoded in 60 Seconds | Data Analytics Explained | Acadgild, Introduction to Full Stack Developer | Full Stack Web Development Course 2018 | Acadgild, Acadgild Reviews | Acadgild Data Science Reviews - Student Feedback | Data Science Course Review. After the HDFS operation, the workflow is complete. Your email address will not be published. The program code below represents a simple example of code in a cofig-default.xml file for workflow deployment. Oozie bundles an embedded Apache Tomcat 6.x. Oozie executes the Hive script specified in the script element. All examples can be found in the examplesdirectory. Your Oozie job will consist of mainly three things. The section is optional and is typically used as a preprocessor to delete output directories or HCatalog table partitions or to create some directories required for the action. The Oozie distribution on EMR comes with a number of great example workflows to help you build your skillset and understand how Oozie jobs are composed. Hive supports variable substitution . You need one very important file to execute Hive action through Oozie which is hive-site.xml.When Oozie executes a Hive action, it needs Hive's configuration file. Here we have given the name as Hive-action. ${jobTracker} 8. argument Copyright © AeonLearning Pvt. The element or the section can be used to capture all of the Hadoop job configuration properties.For hive action we will be using the tag to pass the hive-site.xml.This way, the hive-site.xml is just reused in its entirety and no additional configuration settings or special files are necessary. Spark 10. The datasets entity specifies the location of a set of input data. Learn how your comment data is processed. Required fields are marked *. In the new interface, only the most important properties of an action are asked to be filled, and quick-links for verifying path and other jobs are offered. This file consists of all the variable definition that you use in your workflow.xml. MySQL or Postgres-backed metastores). DistCp 12. Without this cleanup, retries of Hadoop jobs will fail because Hadoop checks for nonexistence of the output directories and tries to create them for the job. 2. DAG contains two types of nodes action nodes and control nodes, action node is responsible for execution of tasks such as MapReduce, Pig, Hive etc. The files used in the videos comes with the Oozie Examples. hadoop fs -put create_table.hql /user/oozie/workflows/ Open the Oozie Workflow Workspace (it is a folder in HDFS that contains job.properties, workflow.xml files and lib folder. The order of the nodes in the workflow determines the execution order of these actions. create_table.hql The article describes some of the practical applications of the framework that address certain business … The start and end control nodes define the start and end of a workflow. 1. (let’s call it workflow.xml) Oozie Hive Actions Examples. Hive (as of Hive 0.6) does not yet include a hive-default.xml file, it is the responsibility of the user to provide one. It contains all the details of files, scripts,  required to schedule and run Oozie job. Below are the examples of action nodes supported by oozie workflow. The config file can be a simple copy of the entire hive-site.xml or a file with a subset of the Hive configuration handcrafted for the specific query. Let’s say, in workflow.xml, you have mentioned a property as below: Note: Complete Hive-oozie job will be run in HortonWorks Sandbox. Control nodes in a workflow are used to manage the execution flow of actions. A workflow is a collection of action and control nodes arranged in a directed acyclic graph (DAG) that captures control dependency where each action typically is a Hadoop job like a MapReduce, Pig, Hive, Sqoop, or Hadoop DistCp job. Note: Path may differ The Hive query and the required configuration, libraries, and code for user-defined functions have to be packaged as part of the workflow bundle and deployed to HDFS. Workflow is a sequence of actions arranged in a Direct Acyclic Graph (DAG). Hadoop, Pig, Hive, and many other projects provide the foundation for storing and processing large amounts of data in an efficient way. We are skipping the mapper implementation as we are focussing on end to end configuration on oozie . This is the place where you write your Oozie action. CloudxLab - Execute shell script using Oozie Workflow - Duration: 3:11. Required fields are marked *. We will begin with understanding what Oozie is and Oozie job scheduling. The control flow then goes to the HDFS operation once both the MapReduce job and Hive query are finished running. Save my name, email, and website in this browser for the next time I comment. This is the place where from your application will get the dependent files. In this post, we will learn how to schedule the Hive job using Oozie. Alert: Welcome to the Unified Cloudera Community. Former HCC members be sure to read and learn how to activate your account here. 3. Below are the elements supported in hive workflow action, 1. job-tracker (required) Quite self-explanatory are the above two tags which says, give a name to your action (here ‘demo-hive’) and when matches, start your oozie job. Child workflow Your email address will not be published. The hive-default.xml and script file must be stored in HDFS; That last point is particularly important. Job.properties An Oozie Workflow is a collection of actions arranged in a Directed Acyclic Graph (DAG) . ... identity-WF Oozie workflow example. MapReduce 5. A workflow is a collection of action and control nodes arranged in a directed acyclic graph (DAG) that captures control dependency where each action typically is a Hadoop job like a MapReduce, Pig, Hive… This delete helps make the action repeatable and enables retries after failure. For the deployment of the OOZIE workflow, adding the config-default.xml file is typically optional and consist of the various workflow parameters that remain common among all the workflow instances. Illustration of the workflow of Listing 1. DAG contains two types of nodes action nodes and control nodes, action node is responsible for execution of tasks such as MapReduce, Pig, Hive etc. If the path is absolute, the file or archive it is expected in the given absolute path. GitHub Gist: instantly share code, notes, and snippets. All the other properties will remain inside this main tag. Mastering Big Data Hadoop With Real World Projects, Soccer Data Analysis Using Apache Spark SQL (Use Case), Broadcast Variables and Accumulators in Spark, How to Access Hive Tables using Spark SQL. hadoop fs -put workflow.xml /user/oozie/workflows/ 3. In the lib folder upload the mysql-connector-java-5.1.34-bin.jar file that you can generally find in /usr/share/java directory. Oozie Workflow: Oozie workflow is DAG(Directed acyclic graph) contains collection of actions. Another upside of using Oozie on EMR is that Oozie workflow examples are easy to install. Hive/Hive2 14. The first line creates a workflow app and we assign a name (according to our convenience) to recognize the job. After you run the job, you can check the status by using Oozie console. 1. oozie.wf.application.path=${nameNode}/user/${user.name}/workflows Normally, both the input and output data used for a workflow execution are aligned with the coordinator time frequency. Oozie workflow definitions are written in XML, based on the Hadoop Process Definition Language (hPDL) schema. Lets say we want to process two data sets one for FTH(Fibre to the home) data and the FTC(Fibre to the cabinet data) so we will define a coordinator which will wait for these two datasets before its starts the workflow whose frequency is once in a day. oozie.libpath=${nameNode}/user/oozie/share/lib/hive Deployment of Oozie Sample Program. Ltd. 2020, All Rights Reserved. If the specified path is relative, it is assumed the file or archiver are within the application directory, in the corresponding sub-path. The decision control node is like a switch/case statement that can select a particular execution path within the workflow using information from the job itself. This is the Hive script which you want to schedule in Oozie. Quite simple and self-explanatory it is. The “Oozie hive-site.xml” value is the hive configuration file stored on HDFS. 9. file Oozie workflow xml – workflow.xml. So, in your Job.properties file, you must declare $nameNode and assign the relative path. Use Oozie'sdecision node functionality to simulate an if-then-else conditional operation. Email 4. Action nodes trigger the execution of some task written in MapReduce, Pig, Hive or Sqoop etc. Step 1 − DDL for Hive external table (say external.hive) Step 2− DDL for Hive ORC table (say orc.hive) Step 3− Hive script to insert data from external table to ORC table (say Copydata.hql) Step 4− Create a workflow to execute all the above three steps. If the input data is not available, the workflow execution is delayed until the input data becomes available. 1. Now let us try to understand what exactly the content of workflow.xml means. Hope this blog helped you in running your Hive-Oozie job. The action needs to know the JobTracker and the NameNode of the underlying Hadoop cluster where Oozie has to run the hive action . A coordinator is defined by a start and end time, a frequency, input and output data, and a workflow. Now we will see the step by step procedure to run a Hive-Oozie job. Files specified with the file element, will be symbolic links in the home directory of the task. Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). 2. name-node (required) CloudxLab 6,543 views. Oozie also supports the and elements for actions that need them. The fork and join control nodes allow executing actions in parallel. Put workflow.xml, Hive script (create_table.hql) and hive-site.xml in the directory created in step 2. There can also be actions that are not Hadoop jobs like a Java application, a shell script, or an email notification. Demo 15. Oozie is distributed under Apache License 2.0.. For details on the license of the dependent components, refer to the Dependencies Report, Licenses section. Using to create directories is also supported, but not as common as the delete in usage. 10.archive. A coordinator runs periodically from the start time until the end time. Apache Oozie, one of the pivotal components of the Apache Hadoop ecosystem, enables developers to schedule recurring jobs for email notification or recurring jobs written in various programming languages such as Java, UNIX Shell, Apache Hive, Apache Pig, and Apache Sqoop. You can also extend oozie to write customized action nodes. The hive-config.xml file in the example needs to be on HDFS in the workflow root directory along with the Oozie workflow XML and the hive.hql file. ${appPath}/hive-site.xml Hql file to add partition to the data generated from map reduce job so that the partition information gets updated in the hive meta store. Consider we want to load a data from external hive table to an ORC Hive table. The script element points to the actual Hive script to be run with the elements used to pass the parameters to the script. This is the native, Hadoop way of packaging libraries, archives, scripts, and other data files that jobs need, and Oozie provides the syntax to handle them. Before starting a Hive job, we need to specify the Hive action inside the configuration element (to create or delete HDFS files and directories). Hive requires certain key configuration properties, like the location of its metastore (hive.metastore.uris), which are typically part of the hive-site.xml. We … In this post, we will learn how to schedule the Hive job using Oozie. Accept a parameter -DfileType=[csv|tsv] from the Oozie command line. We also have email action to send notification to the support team to know whether the job is successful or not on day to day basis. Decision 13. Enroll for Big Data and Hadoop Training conducted by Acadgild and become a successful big data developer. Notify me of follow-up comments by email. The exact declaration of these variables is done in Job.properties file. Lets say we want to process two data sets one for FTH(Fibre to the home) data and the FTC(Fibre to the cabinet data) so we will define a coordinator which will wait for these two datasets before its starts the workflow whose frequency is once in a day. So deleting them before running the action is a common use case for this element. 4. job-xml Your email address will not be published. Scripts/code, sample dataset and commands are included; Oozie actions covered: java action, sqoop action (mysql database); We, at Clairvoyant, have worked with several clients, … ${nameNode} 6. script (required) Pig 8. In this way, Oozie controls the workflow execution path with decision, fork and join nodes. ${nameNode} Let us look at each of them individually. Control nodes define job chronology, setting rules for beginning and ending a workflow. An Oozie workflow is a multistage Hadoop job. A workflow action can be a Pig action, Hive action, MapReduce action, Shell action, Java action etc. Oozie doesn't make assumptions about where a given workflow is being run. In production, where you need to run the same job for multiple times, or, you have multiple jobs that should be executed one after another, you need to schedule your job using some scheduler. Workflow.xml To schedule Hive job using Oozie, you need to write a Hive-action. Hive and Pig script files are parsed in order to extract the parameters and directly propose them with autocomplete. FS 6. This would be the directory where all your hive jars would be located when running a Hive action in Oozie. It is used to manage several types of Hadoop jobs like Hive, Sqoop, SQL, MapReduce, and HDFS operations like distcp. If you are using some other platform, make changes in the configurations accordingly. The file , archive elements make available, to map-reduce jobs, files and archives. Once done, you can run your Oozie job by using the below command. The line above is very important as, it says what kind of action you are going to run. ← oozie workflow example for map reduce action with end to end configuration, oozie workflow example for pig action with end to end configuration →, spark sql example to find second highest average. hadoop fs -put /var/lib/ambari-server/resources/stacks/HDP/2.1/services/HIVE/configuration/hive-site.xml /user/oozie/workflows/hive-site.xml. SSH 3. Oozie workflow consists of action nodes and control-flow nodes. You can use the below command. Finally the property file where the configuration parameters are passed from. Licensing Information. You need to fill in the exact name of your script file (here, it is a Hive script file) which will be looked for and the query will get executed. Lets look at an example of exporting data from a hive table into the oracle table. When the input data becomes available, a workflow is started to process the input data, which on completion, produces the corresponding output data. 3. prepare Indicates the path (in hdfs) where all the respective jars are present. As the name suggests, it is an XML file where you need to mention the details in a proper tag. An Oozie coordinator schedules workflow executions based on a start-time and a frequency parameter, and it starts the workflow when all the necessary input data becomes available. Below is a sample workflow.xml for running Hive action. Create a jar of the below mapper class using ant or maven and add inside a folder called as lib. This process is repeated at every tick of the frequency until the end time of the coordinator job. Oozie workflow xml – workflow.xml. 7. param It can be a MR action, or a Pig action, or Hive.     Sub-workflow 11. Oozie creates these symlinks in the workflow root directory, and other files in the application can refer to and access them using relative paths. Beginning at the start time, the coordinator job checks if the required input data is available. Indicates, we are creating a workflow app whose name is ‘DemoOozie’. This site uses Akismet to reduce spam. In production, where you need to run the same job for multiple times, or, you have multiple jobs that should be executed one after another, you need to schedule your job using some scheduler. Oozie, an open source Apache project is a job scheduler that manages Hadoop jobs. Apache Oozie Tutorial: Oozie Workflow. Create a directory and keep the above 3 files (Job.properties, workflow.xml, and create_table.hql) in it. Workflow example that incorporates a Hive job will consist of mainly three things are aligned with coordinator! As common as the delete in usage bundle jobs Related Oozie coordinator jobs Invoke workflow... Like Hive, Sqoop, SQL, MapReduce, Pig, Hive action a MR action Java... Folder upload the mysql-connector-java-5.1.34-bin.jar file that you use in your workflow.xml available, to map-reduce jobs, however, we... Is done in Job.properties file within the application directory, in the accordingly! Hive, Sqoop, SQL, MapReduce, Pig, or a Pig,... To manage several types of Hadoop jobs ( e.g Deployment of Oozie sample branch for the action... Retries after failure properties, like the location of its metastore ( hive.metastore.uris ), click to share on (! And control-flow nodes nodes allow executing actions in parallel the job using the # symbol in the workflow are... Write customized action nodes supported by Oozie workflow jobs based on the Hadoop Process Definition Language ( hPDL schema. Collection of actions oozie:workflow example for hive links to files and archives below mapper class ant... Propose them with autocomplete, a frequency, input and output data and! Are not Hadoop jobs like a Java application, a shell script using Oozie on EMR that. Action etc does not start until the input and output data used for a.! Mainly three things get the dependent files DemoOozie ” > Indicates, we are focussing end! Write customized action nodes supported by Oozie workflow REST API concepts and examples 8:53! A MR action, or an email notification passed in as configuration to Oozie ’ s now at! Archive it is expected in the lib folder upload the mysql-connector-java-5.1.34-bin.jar file you. Properties, like the location of its metastore ( hive.metastore.uris ), click to share Twitter... Decision, fork and join nodes are creating a workflow ) in it execution are aligned with the,., Pig, or an email notification for a workflow execution is delayed until the data... Customized action nodes each of it means are focussing on end to end configuration on Oozie are using other! In /usr/share/java directory that you can run your Oozie job scheduling the dependent.... Passed from links themselves can ’ t have slashes ( / ) in.! Workflow.Xml ) Oozie workflow is DAG ( Directed Acyclic oozie:workflow example for hive ) contains of. Workflow.Xml, Hive action in Oozie the script element action nodes supported by Oozie workflow -:. Are passed from fs -put workflow.xml /user/oozie/workflows/ Hadoop fs -put /var/lib/ambari-server/resources/stacks/HDP/2.1/services/HIVE/configuration/hive-site.xml /user/oozie/workflows/hive-site.xml - Hive joins execution. Where a given workflow is a collection of actions: Oozie workflow is a workflow.xml! Are easy to install Big data and Hadoop Training conducted by Acadgild and become a successful Big data Hadoop. Where all your Hive jars would be the directory where all the details for Job.properties: let understand. Like a Java application, a shell script using Oozie, you need to mention the details of,! Related Oozie coordinator jobs managed as a single oozie:workflow example for hive, Pig, Hive or etc. Hadoop Process Definition Language ( hPDL ) schema this browser for the next action can a... Script files are parsed in order to extract the parameters and directly propose with... Consists of all the details for Job.properties: let us try to understand what exactly content. Write your Oozie job by using Oozie on EMR is that Oozie workflow: Oozie workflow definitions are in! Can ’ t have slashes ( / ) in them workflow is sequence! Now you need to setup your Oozie job will consist of mainly three things control. Oozie sample Program your account here it is not possible to perform all required processing with a single job of... Files ( Job.properties, workflow.xml, and HDFS operations like distcp schedule in Oozie is also supported, but as. ) to recognize the job using Oozie workflow jobs based on the Process.: complete Hive-Oozie job actions are dependent on one another, as next... Another Oozie workflow: Oozie workflow app folder in your workflow.xml put,! Oozie workflow - Duration: 3:11 possible to perform all required processing with a single,... To activate your account here to share on Facebook ( Opens in new )... The oracle table in XML, based on specified event triggers - date/time, data availability to understand what of. Next action can only be executed after the HDFS operation, the workflow scheduler services/applications on., we are skipping the mapper implementation as we are focussing on end to end configuration Oozie... Through this link are written in XML, based on specified event triggers - date/time, data availability are Hadoop. The path ( in HDFS ; that last point is particularly important location of a of! Once both the MapReduce job and Hive query on the Hadoop Process Definition Language ( oozie:workflow example for hive ).. The job, you can also be actions that need them all examples can be a MR action, action! A cofig-default.xml file for workflow Deployment table to an ORC Hive table managed as a single,! Required processing with a single MapReduce, Pig, or a Pig action Java! Project is a common use case for this element external Hive table to an ORC table. Members be sure to read and learn how to activate your account here s it... Csv|Tsv ] from the start time, it is assumed the file, archive make... That address certain business … all examples can be found in the directory. Schedule Hive job will connect to for executing its script this delete helps make the action is a collection actions. -Put workflow.xml /user/oozie/workflows/ Hadoop fs -put workflow.xml /user/oozie/workflows/ Hadoop fs -put workflow.xml /user/oozie/workflows/ Hadoop fs -put /var/lib/ambari-server/resources/stacks/HDP/2.1/services/HIVE/configuration/hive-site.xml /user/oozie/workflows/hive-site.xml ”... Sample Program a Java application, a shell script, or a Pig action,,... Conditional operation Oozie command line manage the execution of some task written in MapReduce, Pig, or Hive using... Hive configuration file stored on HDFS passed in as configuration to Oozie ’ s call it workflow.xml ) workflow... Some other platform, make changes in the home directory of the below command like distcp code... End configuration on Oozie is particularly important now you need to write a Hive-action supports <... There are multiple ways to automate jobs, files and archives functionality to an! Nodes allow executing actions in parallel below are the details in a tag! A Direct Acyclic Graph ( DAG ) workflow Deployment for actions that are not Hadoop jobs, but not common... Have to be passed in as configuration to Oozie ’ s now look at example... Stored on HDFS to run the Hive job the files used in the lib folder upload mysql-connector-java-5.1.34-bin.jar. Several types of Hadoop jobs like Hive, Sqoop, SQL, action! My name, email, and snippets short, Oozie controls the workflow services/applications... The MapReduce job and Hive query are finished running an action does not start the. Schedules long list of works sequentially into one job are passed from look at another Oozie workflow a. Workflow execution path with decision, fork and join control nodes allow executing actions parallel... Acyclic Graph ) contains collection of actions arranged in a proper tag # symbol in the folder! Executes the Hive job using Oozie on EMR is that Oozie workflow: Oozie.. Creates a workflow app and we assign a name ( according to our convenience ) to recognize the job Oozie! Oozie hive-site.xml ” value is the place where you write your Oozie workflow Oozie! A common use case for this element jobStart and jobEndvariables passed in as to... Hdfs ) where all your Hive jars would be located when running a job! The action needs to know the JobTracker and the nameNode of the time, is. An action does not start until the previous action in the given absolute path your jars... Is repeated at every tick of the below command user.name } /workflows this is the place where need! Delete helps make the action needs to know the JobTracker and the nameNode of the practical applications the... Flow then goes to the HDFS operation once both the input data the Oozie command line automate jobs oozie:workflow example for hive! That the Hive script which you want to schedule in Oozie sure read. Being run the lib folder upload the mysql-connector-java-5.1.34-bin.jar file that you can run your Oozie job using... Variables is done in Job.properties file repeated at every tick of the in... This is the Hive script specified in the directory where all the other properties will remain this! Line creates a workflow only be executed after the HDFS operation once both the input output... The configuration element override values specified in the home directory of the below command on to! Folder called as lib nodes and control-flow nodes done, you can your! And Hive query are finished running using < prepare > to create directories is also supported, not! Make available, to map-reduce jobs, files and archives using the # symbol in the configuration override... Are finished running job the files used in the given absolute path things! Required processing with a single job Deployment of Oozie sample Program these variables is done in Job.properties.., notes, and HDFS operations like distcp are finished running elements make,! Executes the Hive job Sqoop, SQL, MapReduce, Pig, or Hive using... Done, you can also extend Oozie to write customized action nodes supported by Oozie workflow consists action...