big-data-e2e

entire steps got automated

Prerequisites: Ubuntu 18.04 LTS version is needed.

install java and ssh

sudo apt install open-vm-tools-desktop git vim net-tools -y

sudo apt install openjdk-8-jre-headless

for installing ssh

sudo apt-get install openssh-server openssh-client

ssh-keygen -t rsa -P ""

cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

ssh localhost

get the components from the git repo

cd /opt/

git clone https://github.com/Sathiyarajan/big-data-e2e.git

cp -r big-data-e2e/* .

step 4 : paste the following contents in /root/.bashrc.

export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64

export ZOOKEEPER_HOME=/opt/zookeeper/zookeeper-3.4.10
export ZOOKEEPER_CONF_DIR="$ZOOKEEPER_HOME/conf"
export ZOOKEEPER_CLASSPATH="$ZOOKEEPER_CONF_DIR"
export PATH=$PATH:$ZOOKEEPER_HOME/bin

export HADOOP_HOME=/opt/hadoop/hadoop-2.7.3
export HADOOP_INSTALL=$HADOOP_HOME
export HADOOP_MAPRED_HOME=$HADOOP_HOME
export HADOOP_COMMON_HOME=$HADOOP_HOME
export HADOOP_HDFS_HOME=$HADOOP_HOME
export YARN_HOME=$HADOOP_HOME
export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native
export PATH=$PATH:$HADOOP_HOME/sbin:$HADOOP_HOME/bin

export SQOOP_HOME=/opt/sqoop/sqoop-1.4.6.bin__hadoop-2.0.4-alpha
export PATH=$PATH:$SQOOP_HOME/bin

export HBASE_HOME=/opt/hbase/hbase-1.2.10
export PATH=$PATH:$HBASE_HOME/bin

export SPARK_HOME=/opt/spark/spark-2.2.1-bin-hadoop2.7
export PATH=$SPARK_HOME/bin:$PATH

export HIVE_HOME=/opt/hive/apache-hive-1.2.1-bin
export PATH=$PATH:$HIVE_HOME/bin

export HCAT_HOME=$HIVE_HOME/hcatalog

export PIG_HOME=/opt/pig/pig-0.16.0
export PATH=$PATH:/opt/pig/pig-0.16.0/bin

export FLUME_HOME=/opt/flume/apache-flume-1.9.0-bin
export PATH=$PATH:$FLUME_HOME/bin/

alias start_hadoop=/opt/hadoop/hadoop-2.7.3/sbin/start-all.sh
alias stop_hadoop=/opt/hadoop/hadoop-2.7.3/sbin/stop-all.sh
alias start_hive=/opt/hive/apache-hive-1.2.1-bin/bin/hive
alias spark_shell=$SPARK_HOME/bin/spark-shell
alias spark_submit=$SPARK_HOME/bin/spark-submit

start all the services with appropriate commands.

to setup in windows use ubuntu from app store and install it and setup the big data environment by following the above steps.

Skewed Joins

https://medium.com/expedia-group-tech/skew-join-optimization-in-hive-b66a1f4cc6ba

important links

hadoop: https://data-flair.training/blogs/install-hadoop-on-single-machine/

hive: https://data-flair.training/blogs/apache-hive-installation/

spark: https://data-flair.training/blogs/install-spark-ubuntu/

pig: https://data-flair.training/blogs/apache-pig-installation-ubuntu-tutorial/

HDFS hacks

hadoop fs -ls /tmp/data | sed '1d;s/  */ /g' | cut -d\  -f8

linux hacks

#find string with special characters
grep -vrnw . -e "TEST_"

# find and replace with backupfile creation
find . -name '*.SQL' |xargs perl -pi -e 's/TEST1_/TEST_/g'

# delete matching multiple files in a sub directories
find . -name \*.bak -type f -delete


# find file which is more than 50MB in size in a direcroty
find . -type f -size +5M -exec ls -lh {} \; | awk '{print $9 "|| Size :" $5}'

# find a file which created recently
find . -type f -mmin -5

#find a top 10 files in size
find . -type f -printf "%s\t%p\n" | sort -nr | head -10

#find a top 10 directories in size
alias ducks='du -cks * | sort -rn | head'
du -a . | sort -n -r | head

#List overall file size in HDFS:
hadoop fs -du -s -h /hdfs/path/

#List only files and directories in HDFS:
hadoop fs -count -v -h /hdfs/path/ (human readable GB, MB)
hadoop fs -count -v /hdfs/path (give the exact count on directory,files)

#List only files in HDFS:
hadoop fs -ls -R /hdfs/path/* | grep -v '^d' | wc -l --> list only files