Author Archives: shalishvj : My Experience with BigData

About shalishvj : My Experience with BigData

6+ years of experience using Bigdata technologies in Architect, Developer and Administrator roles for various clients. • Experience using Hortonworks, Cloudera, AWS distributions. • Cloudera Certified Developer for Hadoop. • Cloudera Certified Administrator for Hadoop. • Spark Certification from Big Data Spark Foundations. • SCJP, OCWCD. • Experience in setting up Hadoop clusters in PROD, DR, UAT , DEV environments.

Oozie: CRON style scheduling in Oozie

Cron scheduling adds a lot of flexibility while scheduling jobs using the Oozie coordinator. Its bit tricky, but once you familiarize its going to benefit a lot. Here, just focus on the frequency part in your coordinator.xml <coordinator-app name=”oozie-coordinator” frequency=”0/10 … Continue reading

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Oozie: How to pass current date to Work Flow

Coordinator.xml <coordinator-app name=”oozie-coordinator” frequency=”1440″ start=”2017-10-06T15:00Z” end=”2099-09-19T13:00Z” timezone=”Canada/Eastern” xmlns=”uri:oozie:coordinator:0.1″> <action> <workflow> <app-path>${workflowxml}</app-path> <configuration> <property> <name>currentDate</name> <value>${coord:formatTime(coord:dateOffset(coord:nominalTime(), 0, ‘DAY’), “yyyyMMdd”)} </value> </property> </configuration> </workflow> </action> </coordinator-app> **Change “0” to -1 if you prefer PREVIOUS DATE Access currentDate in your workflow.xml and pass … Continue reading

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Tips: Hive

Mask a Column Create a table, Insert values to it CREATE TABLE IF NOT EXISTS employee_test1 ( eid String, name String) ROW FORMAT DELIMITED FIELDS TERMINATED BY ‘\t’ LINES TERMINATED BY ‘\n’ STORED AS TEXTFILE; INSERT INTO TABLE employee_test1 VALUES … Continue reading

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Hadoop Cluster : Run Command on ALL Nodes

Its usually tough to run a command on all nodes of a hadoop cluster. Here is a script to do that.. run_command !/bin/bash TPUT=’tput -T xterm-color’ txtund=$(${TPUT} sgr 0 1) # Underline txtbld=$(${TPUT} bold) # Bold txtrst=$(${TPUT} sgr0) # Reset … Continue reading

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Some Curl Commands for BigData

Writing to HDFS curl -i -X PUT -T $file -L “http://$namenode:50070/webhdfs/v1//$file?op=CREATE&$user&#8221; Reading from HDFS curl -i -X GET “http://$namenode:50070/webhdfs/v1//$file?op=OPEN&#8221; In a kerberized environment (Writing to HDFS) curl –negotiate -ku : -X PUT $file “http://:50070/webhdfs/v1//$file?op=CREATE&; OR curl -iku $userName:$password -L -T … Continue reading

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Truststore & Keystore

In SSL handshake, TrustStore is to verify credentials stores certificates from third party, Java application communicate or certificates signed by CA(certificate authorities like Verisign) which can be used to identify third party.   KeyStore is to provide credential. stores private … Continue reading

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Integrating Kafka and Storm

Intro This article focuses on integrating Storm and Kafka Data is not encrypted in this case Create client_jaas file (under /usr/hdp/current/storm-client/conf/) KafkaClient{ required useTicketCache=true renewTicket=true serviceName=”kafka”; }; Client{ required useTicketCache=true renewTicket=false serviceName=”zk”; }; StormClient{ required … Continue reading

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