GitHub user ryan-williams opened a pull request:
https://github.com/apache/spark/pull/3524
fix spillable memory acquisition request
comment says we should request enough memory to potentially double our
memory-pool footprint, but the code was actually requesting more than
that:
currentMemory >= myMemoryThreshold (L66) implies
2*currentMemory - myMemoryThreshold >= currentMemory
(strict inequality in the former implies it in the latter, as well). We
were effectively trying to bump our memory footprint to:
3*currentMemory - myMemoryThreshold
Iâm assuming that the comment reflects the true intent, not that it was
mistaken and we actually want (3*cM - mMT).
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ryan-williams/spark spills
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/3524.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 #3524
----
commit b5d8ec93c4ad222bdc8cea84e69ff513948a307e
Author: Ryan Williams <[email protected]>
Date: 2014-11-13T06:55:02Z
fix spillable memory acquisition request
comment says we should request enough memory to potentially double our
memory-pool footprint, but the code was actually requesting more than
that:
currentMemory >= myMemoryThreshold (L66) implies
2*currentMemory - myMemoryThreshold >= currentMemory
(strict inequality in the former implies it in the latter, as well). We
were effectively trying to bump our memory footprint to:
3*currentMemory - myMemoryThreshold
Iâm assuming that the comment reflects the true intent, not that it was
mistaken and we actually want (3*cM - mMT).
----
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