Apache Hadoop HDFS
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Red Hat Storage Gluster and its integration with Hadoop
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Splitting HDFS files into multiple hive tables
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I am going to show how to split a CSV file stored inside HDFS as multiple Hive tables based on the content of each record. The context is simple. We are using Flume to collect logs from all over our…
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Kerberos and delegation tokens security with WebHDFS
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WebHDFS is an HTTP Rest server bundle with the latest version of Hadoop. What interests me on this article is to dig into security with the Kerberos and delegation tokens functionalities. I will cover…
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Testing the Oracle SQL Connector for Hadoop HDFS
Categories: Data Engineering | Tags: HDFS, Database, File system, Oracle, CDH, SQL
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By David WORMS
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Oracle to Apache Hive with the Oracle SQL Connector
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In a previous article published last week, I introduced the choices available to connect Oracle and Hadoop. In a follow up article, I covered the Oracle SQL Connector, its installation and integration…
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Options to connect and integrate Hadoop with Oracle
Categories: Data Engineering | Tags: Avro, HDFS, Hive, MapReduce, Sqoop, Database, Java, NoSQL, Oracle, R, RDBMS, SQL
I will list the different tools and libraries available to us developers in order to integrate Oracle and Hadoop. The Oracle SQL Connector for HDFS described below is covered in a follow up article…
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Merging multiple files in Hadoop
Categories: Hack | Tags: HDFS, File system, Hadoop
This is a command I used to concatenate the files stored in Hadoop HDFS matching a globing expression into a single file. It uses the “getmerge” utility of but contrary to “getmerge”, the final…
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Hadoop and R with RHadoop
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RHadoop is a bridge between R, a language and environment to statistically explore data sets, and Hadoop, a framework that allows for the distributed processing of large data sets across clusters of…
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HDFS and Hive storage - comparing file formats and compression methods
Categories: Big Data | Tags: Analytics, Hive, ORC, Parquet, File Format
A few days ago, we have conducted a test in order to compare various Hive file formats and compression methods. Among those file formats, some are native to HDFS and apply to all Hadoop users. The…
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Two Hive UDAF to convert an aggregation to a map
Categories: Data Engineering | Tags: Hive, Java, HBase, File Format
I am publishing two new Hive UDAF to help with maps in Apache Hive. The source code is available on GitHub in two Java classes: “UDAFToMap” and “UDAFToOrderedMap” or you can download the jar file. The…
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Timeseries storage in Hadoop and Hive
Categories: Data Engineering | Tags: HDFS, Hive, CRM, timeseries, Tuning, Hadoop, File Format
In the next few weeks, we will be exploring the storage and analytic of a large generated dataset. This dataset is composed of CRM tables associated to one timeserie table of about 7,000 billiard rows…
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Storage and massive processing with Hadoop
Categories: Big Data | Tags: HDFS, Hadoop, Storage
Apache Hadoop is a system for building shared storage and processing infrastructures for large volumes of data (multiple terabytes or petabytes). Hadoop clusters are used by a wide range of projects…
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