GitHub user bjchambers opened a pull request:
https://github.com/apache/incubator-beam/pull/521
[BEAM-37] DoFnReflector: Add inoker interface and generate code
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The method to call for a DoFnWithContext requires reflection since the
shape of the parameters may change. Doing so in each processElement call
puts this refelection in the hot path.
This PR introduces a DoFnInvoker interface which is bound to a specific
DoFnWithContext and delegates the three important methods (startBundle,
processElement, finishBundle).
It uses byte-buddy to generate a simple trampoline implementation of
the DoFnInvoker class for each type of DoFnWithContext.
This leads to 2-3x better performance in micro-benchmarks of method
dispatching.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/bjchambers/incubator-beam byte-buddy-dofn
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-beam/pull/521.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 #521
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commit 009be346ecbf4e2db899982f6070e2208e47be10
Author: Ben Chambers <bchamb...@google.com>
Date: 2016-06-22T13:47:23Z
[BEAM-37] DoFnReflector: Add inoker interface and generate code
The method to call for a DoFnWithContext requires reflection since the
shape of the parameters may change. Doing so in each processElement call
puts this refelection in the hot path.
This PR introduces a DoFnInvoker interface which is bound to a specific
DoFnWithContext and delegates the three important methods (startBundle,
processElement, finishBundle).
It uses byte-buddy to generate a simple trampoline implementation of
the DoFnInvoker class for each type of DoFnWithContext.
This leads to 2-3x better performance in micro-benchmarks of method
dispatching.
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