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ARCHIVING • Hadoop Archives, or Big Data Analytics with Hadoop

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ARCHIVING
• Hadoop Archives, or HAR files, are a file archiving
facility that packs files into HDFS blocks more
efficiently
• Reduce the NameNode memory usage while still
allowing transparent access to files.
• An effective solution for the small files problem
– http://developer.yahoo.com/blogs/hadoop/posts/2010/07/hadoop
_archive_file_compaction/
– http://www.cloudera.com/blog/2009/02/the-small-files-problem/
• Archives are immutable
• Rename, deletes and create return an error
• Hadoop Archives is exposed as a file system
MapReduce will be able to use all the logical input
files in Hadoop Archives as input
49 Big Data Analytics with Hadoop
Master Index
Index
HAR File Layout
Data

Veröffentlicht in: Technologie, Bildung, Business
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