GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/2259
[SPARK-3030] [PySpark] Reuse Python worker
Reuse Python worker to avoid the overhead of fork() Python process for each
tasks. It also tracks the broadcasts for each worker, avoid sending repeated
broadcasts.
This can reduce the time for dummy task from 22ms to 13ms (-40%).
It's enabled by default, could use `spark.python.worker.reuse = false` to
disable it.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark reuse-worker
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/2259.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 #2259
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commit 8d2f08cfdb62ea539f35e0a8168d104212a13988
Author: Davies Liu <[email protected]>
Date: 2014-09-04T00:08:35Z
reuse python worker
commit 6123d0f8e55dd78039f5c59023b12ab54651fe12
Author: Davies Liu <[email protected]>
Date: 2014-09-04T01:06:45Z
track broadcasts for each worker
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