GZinga: Seekable and Splittable Gzip
Generally, data compression techniques are used to conserve space and network bandwidth. Widely used compression techniques include Gzip, bzip2, lzop, and 7-Zip. According to performance benchmarks, lzop is one of the fastest compression algorithms, while bzip2 has a high compression ratio but is very slow. Gzip offers the lowest level of compression. Gzip is based on the DEFLATE algorithm, which
Best splittable compression for Hadoop input = bz2?
We've realized a bit too late that archiving our files in GZip format for Hadoop processing isn't such a great idea. GZip isn't splittable, and for reference, here are the problems which I won't repeat: Very basic question about Hadoop and compressed input files Hadoop gzip compressed files Hadoop gzip input file using only one mapper Why can't hadoop split up a large text file and then compress t
pigz - Parallel gzip
A parallel implementation of gzip for modern multi-processor, multi-core machines Welcome to the pigz home page. You can download the latest source code right here: pigz source code version 2.8 (19 Aug 2023) in tar.gz format (118K, SHA-256 checksum eb872b4f0e1f0ebe59c9f7bd8c506c4204893ba6a8492de31df416f0d5170fd0, GPG signature) Latest version of pigz and its signature (version-independent links) p
Hiveとか - ‡A Case Of Identity‡
HiveでSequenceFileかつ圧縮しているのに、容量が生の状態より大きいという状態になっていたのですが、セットすべきパラメータが違ったようです。 The right configuration parameter is: set mapred.output.compression.type=BLOCK; http://mail-archives.apache.org/mod_mbox/hadoop-hive-user/200907.mbox/%3C34fd060d0907272234l732f6ed2h70a136f1b611f046@mail.gmail.com%3E これを設定したらきちんと圧縮されました。 HiveWikiには SET io.seqfile.compression.type=BLOCK; -- NONE/RECORD/BLOCK (see below) htt
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