I want to Read/write protocol buffer messages from/to HDFS with Apache Spark. I found these suggested ways: 1) Convert protobuf messsages to Json with Google's Gson Library and then read/write the...

How do you write RDD[Array[Byte]] to a file using Apache Spark and read it back again?

I am trying to write a snappy block compressed sequence file from a map-reduce job. I am using hadoop 2.0.0-cdh4.5.0, and snappy-java 1.0.4.1 Here is my code: package jinvestor.jhouse.mr; impor...

I have a bunch of Hadoop SequenceFiles that have been written with some Writable subclass I wrote. Let's call it FishWritable. This Writable worked out well for a while, until I decided there was ...

What is the advantage of Hadoop Sequence File over HDFS flat file(Text)? In what way Sequence file is efficient? Small files can be combined and written into a sequence file, but the same can be ...

I want to be able to read / write images on an hdfs file system and take advantage of the hdfs locality. I have a collection of images where each image is composed of 2D arrays of uint16 basi...

I am using Hadoop 1.0.3. I write logs to an Hadoop sequence file into HDFS, I call syncFS() after each bunch of logs but I never close the file (except when I am performing daily rolling). What I...

I would like to be able to create a custom InputFormat that reads sequence files, but additionally exposes the file path and offset within that file where the record is located. To take a step bac...

I have some mapred data from the Common Crawl that I have stored in a SequenceFile format. I have tried repeatedly to use this data "as is" with Hive so I can query and sample it at various stages....

There exists in Mahout a command for create sequence file as bin/mahout seqdirectory -c UTF-8 -i <input address> -o <output address>. I want use this command as code API.