orc file example

Create a Orc file by specifying STORED AS RCFILE in the end of a CREATE TABLE statement. It is optimized for large streaming reads, but with integrated support for finding required rows quickly. The upcoming Hive 0.11 will add a new file format named Optimized Row Columnar (ORC) file that uses and retains the type information from the table definition. For this post, I’m using the latest release, org.apache.orc:orc-mapreduce:1.4.0. These were executed on CDH 5.2.0 running Hive 0.13.1 + Cloudera back ports. Hortonworks performed a comparison task of compression of all file formats and published a report, that ORC achieves the highest compression of 78% when compared to … ORC shows better performance than Text, Sequence and RC file formats. Metadata dump of the ORC file created by Hive is orc_dump.json. First you’ll need to add this your projects pom file if you haven’t already. Original answer dated: May 30 '14 at 16:27 For ORC files, Hive version 1.2.0 and later records the writer time zone in the stripe footer. Building off our first post on TEXTFILE and PARQUET, we decided to show examples with AVRO and ORC.AVRO is a row oriented format, while Optimized Row Columnar (ORC) is a format tailored to perform well in Hive. The Parquet format and older versions of the ORC format do not record the time zone. The files for each example are zipped for easy download. Let us understand how is the Optimized Row Columnar (ORC) file format different in comparison to our usual flat file. It was designed to overcome limitations of the other Hive file formats. ORC file can contain lightweight indexes and bloom filters. In this example the physical table scan loads only columns name and age at runtime, without reading the contacts column from the file system. The question: How to convert .txt / .csv file to ORC format. Below is a code sample of how to do it using Apache Crunch. Below is a list of links to OrcaFlex example topics. First Example: Simple Write This first example is lifted directly from Apache ORC’s documentation. This improves read performance. Created the sample.orc file locally using the code in Creator.java; Uploaded to HDFS and created an external table in hive to point to that location (queries in queries.hql) Created a new table using Hive with 128MB stripe size and 64KB buffer size, and inserted data into it. You can visualize the structure of an ORC file as an area that is divided into Header, body and footer. Highly Compressed data: ORC is more compression efficient data storage than other file format. Which carried on the torch for the original Hive+ORC Apache wiki page. Within each topic are a number of examples which each comprise one or more simulation files, a description pdf file, workspace files and sometimes other supporting files. ORC is a columnar file format. Example. Credit to @Owen and the ORC Apache project team, ORC's project site has a fully maintained up-to-date documentation on using either the Java or C++ stand alone tool on ORC file stored on a Linux local file system.

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