[GitHub] surekhasaharan commented on a change in pull request #6126: New quickstart and tutorials

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surekhasaharan commented on a change in pull request #6126: New quickstart and tutorials
URL: https://github.com/apache/incubator-druid/pull/6126#discussion_r209061274
 
 

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 File path: docs/content/tutorials/tutorial-batch-hadoop.md
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+---
+layout: doc_page
+---
+
+# Tutorial: Load batch data using Hadoop
+
+This tutorial shows you how to load data files into Druid using a remote Hadoop cluster.
+
+For this tutorial, we'll assume that you've already completed the previous [batch ingestion tutorial](tutorial-batch.html).
+using Druid's native batch ingestion system.
+
+## Install Docker
+
+This tutorial requires [Docker](https://docs.docker.com/install/) to be installed on the tutorial machine.
+
+Once the Docker install is complete, please proceed to the next steps in the tutorial.
+
+## Build the Hadoop docker image
+
+For this tutorial, we've provided a Dockerfile for a Hadoop 2.8.3 cluster, which we'll use to run the batch indexing task.
+
+This Dockerfile and related files are located at `quickstart/tutorial/hadoop/docker`.
+
+From the druid-${DRUIDVERSION} package root, run the following commands to build a Docker image named "druid-hadoop-demo" with version tag "2.8.3":
+
+```
+cd quickstart/tutorial/hadoop/docker
+docker build -t druid-hadoop-demo:2.8.3 .
+```
+
+This will start building the Hadoop image. Once the image build is done, you should see the message `Successfully tagged druid-hadoop-demo:2.8.3` printed to the console.
+
+## Setup the Hadoop docker cluster
+
+### Create temporary shared directory
+
+We'll need a shared folder between the host and the Hadoop container for transferring some files.
+
+Let's create some folders under `/tmp`, we will use these later when starting the Hadoop container:
+
+```
+mkdir -p /tmp/shared
+mkdir -p /tmp/shared/hadoop_xml
+```
+
+### Configure /etc/hosts
+
+On the host machine, add the following entry to `/etc/hosts`:
+
+```
+127.0.0.1 druid-hadoop-demo
+```
+
+### Start the Hadoop container
+
+Once the `/tmp/shared` folder has been created and the `etc/hosts` entry has been added, run the following command to start the Hadoop container.
+
+```
+docker run -it  -h druid-hadoop-demo -p 50010:50010 -p 50020:50020 -p 50075:50075 -p 50090:50090 -p 8020:8020 -p 10020:10020 -p 19888:19888 -p 8030:8030 -p 8031:8031 -p 8032:8032 -p 8033:8033 -p 8040:8040 -p 8042:8042 -p 8088:8088 -p 8443:8443 -p 2049:2049 -p 9000:9000 -p 49707:49707 -p 2122:2122  -p 34455:34455 -v /tmp/shared:/shared druid-hadoop-demo:2.8.3 /etc/bootstrap.sh -bash
+```
+
+Once the container is started, your terminal will attach to a bash shell running inside the container:
+
+```
+Starting sshd:                                             [  OK  ]
+18/07/26 17:27:15 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
+Starting namenodes on [druid-hadoop-demo]
+druid-hadoop-demo: starting namenode, logging to /usr/local/hadoop/logs/hadoop-root-namenode-druid-hadoop-demo.out
+localhost: starting datanode, logging to /usr/local/hadoop/logs/hadoop-root-datanode-druid-hadoop-demo.out
+Starting secondary namenodes [0.0.0.0]
+0.0.0.0: starting secondarynamenode, logging to /usr/local/hadoop/logs/hadoop-root-secondarynamenode-druid-hadoop-demo.out
+18/07/26 17:27:31 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
+starting yarn daemons
+starting resourcemanager, logging to /usr/local/hadoop/logs/yarn--resourcemanager-druid-hadoop-demo.out
+localhost: starting nodemanager, logging to /usr/local/hadoop/logs/yarn-root-nodemanager-druid-hadoop-demo.out
+starting historyserver, logging to /usr/local/hadoop/logs/mapred--historyserver-druid-hadoop-demo.out
+bash-4.1#  
+```
+
+The `Unable to load native-hadoop library for your platform... using builtin-java classes where applicable` warning messages can be safely ignored.
+
+### Copy input data to the Hadoop container
+
+From the druid-${DRUIDVERSION} package root on the host, copy the `quickstart/wikiticker-2015-09-12-sampled.json.gz` sample data to the shared folder:
+
+```
+cp quickstart/wikiticker-2015-09-12-sampled.json.gz /tmp/shared/wikiticker-2015-09-12-sampled.json.gz
+```
+
+### Setup HDFS directories
+
+In the Hadoop container's shell, run the following commands to setup the HDFS directories needed by this tutorial and copy the input data to HDFS.
+
+```
+cd /usr/local/hadoop/bin
+./hadoop fs -mkdir /druid
+./hadoop fs -mkdir /druid/segments
+./hadoop fs -mkdir /quickstart
+./hadoop fs -chmod 777 /druid
+./hadoop fs -chmod 777 /druid/segments
+./hadoop fs -chmod 777 /quickstart
+./hadoop fs -chmod -R 777 /tmp
+./hadoop fs -chmod -R 777 /user
+./hadoop fs -put /shared/wikiticker-2015-09-12-sampled.json.gz /quickstart/wikiticker-2015-09-12-sampled.json.gz
+```
+
+If you encounter namenode errors when running this command, the Hadoop container may not be finished initializing. When this occurs, wait a couple of minutes and retry the commands.
+
+## Configure Druid to use Hadoop
+
+Some additional steps are needed to configure the Druid cluster for Hadoop batch indexing.
+
+### Copy Hadoop configuration to Druid classpath
+
+From the Hadoop container's shell, run the following command to copy the Hadoop .xml configuration files to the shared folder:
 
 Review comment:
   There's extra space in "Hadoop.xml"

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