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How to test/ create the Livy interactive sessions

The following session is an example of how we can create a Livy session and print out the Spark version:

  1. Create a session with the following command:
    curl  -X POST --data '{"kind": "spark"}' -H "Content-Type: application/json" http://172.25.41.3:8998/sessions​
  2. Wait for the application to spawn, replace the session ID:
    curl  -X POST --data '{"kind": "spark","code":"sc.version"}' -H "Content-Type: application/json" http://172.25.41.3:8998/sessions/25/statements
  3. Replace the session ID and get the result:
    curl  -X GET --data '{"kind": "spark"}'  http://172.25.41.3:8998/sessions/25/statements

*Livy objects properties for interactive sessions

 

How to test the Batch Applications Using the Livy API

Following is the SparkPi test job submitted through Livy API:

To submit the SparkPi job using Livy, you should upload the required jar files to HDFS before running the job. This is the main difference between the Livy API and spark-submit.

>>

curl -H "Content-Type: application/json"  http://172.25.xx.xx:8998/batches -X POST --data ' { "className": "org.apache.spark.examples.SparkPi", "conf": {"spark.executor.memory": "1g"}, "args": [10], "file": "/user/hdfs/spark-examples_2.11-2.4.0.7.1.4.0-203.jar"}'

Batch session APIs operate on batch objects, defined as follows:

SandipN_0-1621099987758.png

How to pass job-specific options in POST batches, like we pass to Spark jobs through Spark REPL

curl --negotiate -u:$USER ${LIVY_SERVER}:${LIVY_PORT}/batches -X POST -H 'Content-Type: application/json' -d '{

    "file": "hdfs:///user/livy/depend-jars/example.jar",

    "proxyUser": “sandip”,

    "className": "SparkWordCount",

    "queue": "default",

    "name": "SparkWordCount",

    "jars":["hdfs:///user/livy/depend-jars/hbase-client.jar","hdfs:///user/livy/depend-jars/hbase-common.jar"],

    "files":["hdfs:///user/livy/depend-files/hbase-site.xml","hdfs:///user/livy/depend-files/hive-site.xml"],

    "conf": {

        "spark.driver.memory": "1g",

        "spark.yarn.driver.memoryOverhead": "256",

        "spark.executor.instances": "2",

        "spark.executor.memory": "1g",

        "spark.yarn.executor.memoryOverhead": "256",

        "spark.executor.cores": "1",

        "spark.memory.fraction": "0.2"

    },

    "args":["10"]

}'

Here are the references to pass configurations. 

Batch Request:

Interactive Request:

References:

Running an interactive session with the Livy API

Submitting batch applications using the Livy API

 

https://livy.apache.org/

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