Apache Hadoop Ecosystem
- Hadoop HDFS - 2007 - A distributed file system for reliably storing huge amounts of unstructured, semi-structured and structured data in the form of files.
- Hadoop MapReduce - 2007 - A distributed algorithm framework for the parallel processing of large datasets on HDFS filesystem. It runs on Hadoop cluster but also supports other database formats like Cassandra and HBase.
- Cassandra - 2008 - A key-value pair NoSQL database, with column family data representation and asynchronous masterless replication.
- HBase - 2008 - A key-value pair NoSQL database, with column family data representation, with master-slave replication. It uses HDFS as underlying storage.
- Zookeeper - 2008 - A distributed coordination service for distributed applications. It is based on Paxos algorithm variant called Zab.
- Pig - 2009 - Pig is a scripting interface over MapReduce for developers who prefer scripting interface over native Java MapReduce programming.
- Hive - 2009 - Hive is a SQL interface over MapReduce for developers and analysts who prefer SQL interface over native Java MapReduce programming.
- Mahout - 2009 - A library of machine learning algorithms, implemented on top of MapReduce, for finding meaningful patterns in HDFS datasets.
- Sqoop - 2010 - A tool to import data from RDBMS/DataWarehouse into HDFS/HBase and export back.
- YARN - 2011 - A system to schedule applications and services on an HDFS cluster and manage the cluster resources like memory and CPU.
- Flume - 2011 - A tool to collect, aggregate, reliably move and ingest large amounts of data into HDFS.
- Storm - 2011 - A system to process high-velocity streaming data with 'at least once' message semantics.
- Spark - 2012 - An in-memory data processing engine that can run a DAG of operations. It provides libraries for Machine Learning, SQL interface and near real-time Stream Processing.
- Kafka - 2012 - A distributed messaging system with partitioned topics for very high scalability.
- SolrCloud - 2012 - A distributed search engine with a REST-like interface for full-text search. It uses Lucene library for data indexing.
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