Apache Hadoop HDFS
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Commercial Apache Hadoop distributions have come and gone. The two leaders, Cloudera and Hortonworks, have merged: HDP is no more and CDH is now CDP. MapR has been acquired by HP and IBM BigInsights…
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Download datasets into HDFS and Hive
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Introduction Nowadays, the analysis of large amounts of data is becoming more and more possible thanks to Big data technology (Hadoop, Spark,…). This explains the explosion of the data volume and the…
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Hadoop Ozone part 3: advanced replication strategy with Copyset
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Hadoop Ozone part 2: tutorial and getting started of its features
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Hadoop Ozone part 1: an introduction of the new filesystem
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Multihoming on Hadoop
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Deploying a secured Flink cluster on Kubernetes
Categories: Big Data | Tags: Flink, HDFS, Kafka, Elasticsearch, Encryption, Kerberos, SSL/TLS
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Clusters and workloads migration from Hadoop 2 to Hadoop 3
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Apache Hadoop YARN 3.0 – State of the union
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Apache Metron in the Real World
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Apache Metron is a storage and analytic platform specialized in cyber security. This talk was about demonstrating the usages and capabilities of Apache Metron in the real world. The presentation was…
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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
Categories: Data Engineering | Tags: Flume, HDFS, Hive, Oozie, Pig, SQL
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…
By David WORMS
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Kerberos and delegation tokens security with WebHDFS
Categories: Cyber Security | Tags: HDFS, Big Data, HTTP, Kerberos
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…
By David WORMS
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Testing the Oracle SQL Connector for Hadoop HDFS
Categories: Data Engineering | Tags: HDFS, Database, File system, Oracle, CDH, SQL
Using Oracle SQL Connector for HDFS, you can use Oracle Database to access and analyze data residing in HDFS files or a Hive table. You can also query and join data in HDFS or a Hive table with other…
By David WORMS
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Oracle to Apache Hive with the Oracle SQL Connector
Categories: Business Intelligence | Tags: HDFS, Hive, Network, Oracle
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…
By David WORMS
May 27, 2013
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…
By David WORMS
May 15, 2013
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…
By David WORMS
Jan 12, 2013
Hadoop and R with RHadoop
Categories: Business Intelligence, Data Science | Tags: HDFS, MapReduce, Thrift, Data Analytics, Learning and tutorial, R, Hadoop, HBase
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…
By David WORMS
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HDFS and Hive storage - comparing file formats and compression methods
Categories: Big Data | Tags: Analytics, Hive, ORC, File Format, Parquet
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
Mar 13, 2012
Two Hive UDAF to convert an aggregation to a map
Categories: Data Engineering | Tags: Hive, File Format, Java, HBase
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…
By David WORMS
Jan 10, 2012
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…
By David WORMS
Nov 26, 2010