creating custom record reader in hadoop

Merging Small Files into SequenceFile 7

This entry was posted in Hadoop Map Reduce and tagged creating custom input format in hadoop creating custom inputformat and recordreader example creating custom record reader in hadoop Dealing with Hadoop's small files problem full fileinputformat example hadoop sequence file input format hadoop custom inputformat example hadoop custom recordreader example Hadoop MapReduce with small files example how to combine small files in hadoop How to manage huge numbers of small files in hadoop mapreduce how to work with large number of small files in hadoop identityreducer hadoop example importing small files into hdfs joining small files into single file in hadoop hdfs mapreduce java merging small files in hadoop Merging Small Files into Avro File merging small files into sequence file hadoop example Processing large set of small files with Hadoop small files problem in hadoop solution for small files problem in hadoop on by

In this post, we will discuss one of the famous use case of SequenceFiles, where we will merge large number of small files into SequenceFile. We will get to this requirement mainly due to the lack efficient processing of large number of small files in hadoop or mapreduce. Need For Merging Small Files: As hadoop stores all the HDFS files metadata in namenode’s main memory(which is a limited value) for […]