Thursday, 6 October 2016

How To Stream JSON Data Into Hive Using Apache Flume

Pre-Requisites of Flume + Hive Project:


NOTE: Make sure that install all the above components

Flume + Hive Project Download Links:

`hadoop-2.6.0.tar.gz` ==> link
`apache-flume-1.6.0-bin.tar.gz` ==> link
`apache-hive-1.2.1-src.tar.gz` ==> link
`kalyan-json-hive-agent.conf` ==> link
`bigdata-examples-0.0.1-SNAPSHOT-dependency-jars.jar` ==> link


1. create "kalyan-json-hive-agent.conf" file with below content

agent.sources = EXEC
agent.sinks = HIVE
agent.channels = MemChannel

agent.sources.EXEC.type = exec
agent.sources.EXEC.command = tail -F /tmp/users.json
agent.sources.EXEC.channels = MemChannel

agent.sinks.HIVE.type = hive
agent.sinks.HIVE.hive.metastore = thrift://localhost:9083
agent.sinks.HIVE.hive.database = kalyan
agent.sinks.HIVE.hive.table = users2
agent.sinks.HIVE.serializer = JSON = MemChannel

agent.channels.MemChannel.type = memory
agent.channels.MemChannel.capacity = 1000
agent.channels.MemChannel.transactionCapacity = 100

2. Copy "kalyan-json-hive-agent.conf" file into "$FUME_HOME/conf" folder

3. Copy "bigdata-examples-0.0.1-SNAPSHOT-dependency-jars.jar" file into "$FLUME_HOME/lib" folder

4. Generate Large Amount of Sample JSON data follow this article.

5. Execute Below Command to Generate Sample JSON data with 100 lines. Increase this number to get more data ...

java -cp $FLUME_HOME/lib/bigdata-examples-0.0.1-SNAPSHOT-dependency-jars.jar \
com.orienit.kalyan.examples.GenerateUsers \
-f /tmp/users.json \
-n 100 \
-s 1

6. Verify the Sample JSON data in Console, using below command

cat /tmp/users.json

7. To work with Flume + Hive Integration

Follow the below steps

Follow this aritcle to work with below procedure.


i. update '~/.bashrc' file with below changes

export HIVE_HOME=/home/orienit/work/apache-hive-1.2.1-bin
export PATH=$HIVE_HOME/bin:$PATH

export HCAT_HOME=$HIVE_HOME/hcatalog
export PATH=$HCAT_HOME/bin:$PATH

ii. reopen the Terminal

iii. start the hive using 'hive' command.

iv. list out all the databases in hive using 'show databases;' command

v. create a new database (kalyan) in hive using below command.

create database if not exists kalyan;

vi. use kalyan database using 'use kalyan;' command

vii. list out all the tables in kalyan database using 'show tables;' command.

viii. create 'users2' table in kalyan database using below command.

  userid BIGINT,
  username STRING,
  password STRING,
  email STRING,
  country STRING,
  state STRING,
  city STRING,
clustered by (userid) into 5 buckets stored as orc;

ix. Display the data from 'users2' table using below command

select * from users2;

x. start the hive in external metastore db mode using below command

hive --service metastore

8. Execute the below command to `Extract data from JSON data into Hive using Flume`

$FLUME_HOME/bin/flume-ng agent -n agent --conf $FLUME_HOME/conf -f $FLUME_HOME/conf/kalyan-json-hive-agent.conf -Dflume.root.logger=DEBUG,console

9. Verify the data in console

10. Verify the data in Hive 

Execute below command to get the data from hive table 'users2'

select * from users2;

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