GitHub user maropu opened a pull request:
https://github.com/apache/spark/pull/3488
[SPARK-4633] Support GZIPOutputStream in spark.io.compression.codec
gzip is widely used in other frameworks such as hadoop mapreduce and tez,
and also
I think that gizip is more stable than other codecs in terms of both
performance
and space overheads.
I have one open question; current spark configurations have a block size
option
for each codec (spark.io.compression.[gzip|lz4|snappy].block.size).
As # of codecs increases, the configurations have more options and
I think that it is sort of complicated for non-expert users.
To mitigate it, my thought follows;
the three configurations are replaced with a single option for block size
(spark.io.compression.block.size). Then, 'Meaning' in configurations
will describe "This option makes an effect on gzip, lz4, and snappy.
Block size (in bytes) used in compression, in the case when these
compression
codecs are used. Lowering...".
Thought?
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/maropu/spark DeflaterCodecSpike
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/3488.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3488
----
commit 2b8c62503c7b41d814d67c7034084c52856388e4
Author: Takeshi Yamamuro <[email protected]>
Date: 2014-11-26T17:14:39Z
Support GZIPOutputStream in spark.io.compression.codec
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