GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/1951
[SPARK-3047] [PySpark] add an option to use str in textFileRDD
str is much efficient than unicode (both CPU and memory), it'e better to
use str in textFileRDD. In order to keep compatibility, use unicode by default.
(Maybe change it in the future).
use_unicode=True:
daviesliu@dm:~/work/spark$ time python wc.py
(u'./universe/spark/sql/core/target/java/org/apache/spark/sql/execution/ExplainCommand$.java',
7776)
real 2m8.298s
user 0m0.185s
sys 0m0.064s
use_unicode=False
daviesliu@dm:~/work/spark$ time python wc.py
('./universe/spark/sql/core/target/java/org/apache/spark/sql/execution/ExplainCommand$.java',
7776)
real 1m26.402s
user 0m0.182s
sys 0m0.062s
We can see that it got 32% improvement!
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark unicode
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/1951.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 #1951
----
commit a0295e11aca5727290a8d8833ed7a714f8ea21e0
Author: Davies Liu <[email protected]>
Date: 2014-08-14T20:23:02Z
add an option to use str in textFile()
str is much efficient than unicode
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