Apache Hadoop HDFS
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Red Hat Storage Gluster and its integration with Hadoop
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I had the opportunity to be introduced to Red Hat Storage and Gluster in a joint presentation by Red Hat France and the company StartX. I have here recompiled my notes, at least partially. I will…
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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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Testing the Oracle SQL Connector for Hadoop HDFS
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Oracle to Apache Hive with the Oracle SQL Connector
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Options to connect and integrate Hadoop with Oracle
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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…
By David WORMS
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Merging multiple files in Hadoop
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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, HBase, HDFS, 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…
By David WORMS
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Two Hive UDAF to convert an aggregation to a map
Categories: Data Engineering | Tags: Analytics, HDFS, Hive, ORC, Parquet
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…
By David WORMS
Mar 6, 2012
Timeseries storage in Hadoop and Hive
Categories: Data Engineering | Tags: HDFS, Hive, CRM, File Format, timeseries, Tuning, Hadoop
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, Nutch, Cloudera, Google, Hadoop
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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