SUMMARY

• Over 7+ Years of IT experience among which 4+ years with excellent knowledge on Cassandra Administration(NoSQL)
• Good experience in Designing, Planning, Administering, Installation, Configuring, Troubleshooting, Performance monitoring and Fine - tuning of Cassandra Cluster.
• Superior knowledge on Cassandra architecture with better understanding of read and write processes including SSTable, Mem-table and Commit log.
• Good Understanding of Distributed Systems and Parallel Processing architecture.
• Excellent knowledge on CQL (Cassandra Query Language), for obtaining the data present in Cassandra by running queries in CQL.
• Experience in Cassandra stress tool for benchmarking Cassandra Cluster.
• Good Knowledge in Cassandra cluster topology and Virtual nodes.
• Experience in installing multi-data center and multi-rack Cassandra cluster.
• Two projects of experience in exporting data into DataStax Cassandra cluster from RDBMS using Java Driver or Sqoop tools.
• Experience in Cassandra data modeling along with managing and scheduling of the data backup and restore operations.
• Good knowledge in implementation of DataStax Java driver to connect, load and retrieve data from Cassandra database.
• Experience in setting up alerts in Ops Center.
• Excellent knowledge on tired and leveled sized compaction strategies.
• Involved in designing various stages of migrating data from RDBMS to Cassandra.

TECHNICAL SKILLS

NoSQL Databases Cassandra: Cluster Management Tools OpsCenter, JMeter, Java driver, Stress tool, Sqoop, Cloudera Manager Server

Automation Tools Puppet,: Relational Databases Microsoft SQL Server, MySQL, OracleHadoop Ecosystems HDFS, MapReduce, Hive, Pig, Oozie, flume, Zookeeper

Security Kerberos: Languages C, Java, HTML, CSSOperating Systems Linux (Red Hat, CentOS, Ubuntu), Windows IDE Eclipse Bug Tracking Tools QC, Bugzilla

WORK EXPERIENCE

Cassandra Admin/Developer

Confidential - Plano, TX

Responsibilities:

• Administered and Maintained a Multi-Datacenter Cassandra cluster
• Trained the team on the concepts of Cassandra and how to build applications on top of it
• Experience in performance tuning a Cassandra cluster to optimize it for writes and reads
• Involved in the process of data modeling Cassandra Schema
• Installed and Configured Data Stax Ops Center and Nagios for Cassandra Cluster maintenance and alerts.
• Benchmarked Cassandra cluster based on the expected traffic for the use case and optimized for low latency. Built Cassandra Cluster both on the physical machines and on AWS
• Created data models in CQL for customer data
• Extensive experience in designingmongoDB multi-sharded cluster and monitoring with MMS
• Worked onmongoDBdatabase concepts such as locking, transactions, indexes, Sharding, replication, schema design
• Exported the business required information to RDBMS using Sqoop to make the data available for BI team to generate reports based on data
• Focused on architectingNoSQL databases like Mongo, Cassandra and Cache database
• Actively participated with the development team to meet the specific customer requirements and proposed effective Hadoop solutions
• Working Knowledge in NoSQL Databases like HBase
• Designed a Star gate solution for the search requirements on top of the Cassandra Cluster
• Implemented advanced procedures like text analytics and processing using the in-memory computing capabilities like spark.
• Data modeled the new solution based on Cassandra and on the use case
• Performance tuning and stress-testing ofNoSQLdatabase environments in order to ensure acceptable database performance in production mode.
• Scheduled repair and cleanup process in production environment
• Provided security to the cluster by implementing Kerberos for Hadoop and Cassandra clusters
• Implemented Partitioning, Dynamic Partitions and Buckets in HIVE for efficient data access.
• Tested the high-availability architecture with enabling/disabling SSL, enabling/disabling Kerberos
• Management Services directories as NFS mount

Cassandra Administrator

Confidential - Dallas, TX

Responsibilities:

• Worked on creating the data model for Cassandra from the current Oracle data model.
• Implemented the multi Data center cluster consisting of Cassandra rings.
• Worked with developers for choosing right compaction strategies and consistency levels.
• Involved in requirements gathering and capacity planning for multi data center (four) Cassandra cluster.
• Testing, evaluation and troubleshooting of differentNoSQL database systems and cluster configurations to ensure high-availability in various crash scenarios
• Administered and maintained multi rack Cassandra cluster using OpsCenter.
• Based on the use case implemented consistency level for reads and writes.
• Automated and deployed Cassandra environments using Chief recipes.
• Optimized the Cassandra cluster by making changes in Cassandra configuration file and Linux OSconfigurations.
• Familiar withmongoDBwrite concern to avoid loss of data during system failures.
• Wrote multiple scripts to monitor Cassandra cluster and OpsCenter.
• Evaluated, benchmarked and tuned data model by running endurance tests using JMeter, Cassandra StressTool and OpsCenter.
• Used Cassandra node tool to manage Cassandra cluster.
• UtilizedCouchBasefor managing user data on the massively multiplayer server
• Evaluated NoSQl storage likeCouchBase and Redis to replace legacy ISAM database
• Involved in commission and decommission of the nodes in the existing Cassandra cluster.
• Performed CRUD operations like Update, Insert and Delete data inmongoDB
• Migrated data from Oracle to Cassandra using Java driver.
• Worked on tuning Bloom filters and configured compaction strategy based on use cases.
• Involved in Data modeling design for various use cases.
• Performed importing data from various sources to the Cassandra cluster using Java/Python APIs or Sqoop.
• Performed backup and recovery operations.

Big data Consultant/ Administrator

Confidential - Atlanta, GA

Responsibilities:

• Installed and Configured Apache Hadoop clusters for application development and Hadoop tools like Hive, Pig, Oozie, Zookeeper, Hbase, Flume and Sqoop.
• Implemented multiple Map Reduce Jobs in java for data cleansing and pre-processing.
• Responsible for Cluster maintenance, adding and removing cluster nodes, Cluster Monitoring
• Hands on experience in writing Linux/Unix Shellscripting andpython Scripting
• Developed a data cleaner for IMDB data files inpythonfor a research project.
• Writtenpythonscripts for internal testing which pushes the data reading form a file into Kafka queue which in turn is consumed by the Storm application.
• Troubleshooting, manage and review data backups and log files.
• Responsible to manage data coming from different sources.
• Worked withpythonto create UDF's and used them as part of Pig Scripts, and usedpythonfor creating graphs for data analysis.
• Involved in importing the real time data to Hadoop using Kafka and implemented the Oozie job for daily imports.
• Managed and scheduled Jobs on a Hadoop cluster.
• REST APIs were developed inpythonfor Video streaming interfaces.
• Involved in defining job flows, managing and reviewing log files.
• Developed analytics data store inpython, MongoDB for data analysis
• Installed Oozie workflow engine to run multiple Map Reduce, HiveHQL and Pig jobs.
• Implemented a script to transmit sysprin information from Oracle to Hbase using Sqoop.
• Participated in requirement gathering form the Experts and Business Partners and converting the requirements into technical specifications.
• Created Hive tables and impala to store the processed results in a tabular format.
• Involved in converting Hive/SQL queries into Spark transformations using Spark RDDs and Scala.
• Learning Supported and maintained HDFS architecture
• Collaborated with application teams to install operating system and Hadoop updates, patches, version upgrades when required.

Linux Administrator

Confidential

Responsibilities:

• Installation and configuration of Linux for new build environment.
• Created volume groups logical volumes and partitions on the Linux servers and mounted file systems on the created partitions.
• Deep understanding of monitoring and troubleshooting mission critical Linux machines.
• Improve system performance by working with the development team to analyze, identify and resolve issues quickly.
• Ensured data recover by implementing system and application level backups.
• Performed various configurations, which include networking and IPtable, resolving host names and SSHkeyless login.
• Managing Disk File Systems, Server Performance, Users Creation and Granting file access Permissions andRAID configurations.
• Automated administration tasks through scripting and Job Scheduling in CRON.
• Experience in adding, removing or updating user account information along with resetting their passwords.
• Creating and managing Logical volumes; Installing and updating packages using YUM.
• Installed and maintained software packages (.rpm) as necessary.