GitHub user d2r opened a pull request:
https://github.com/apache/storm/pull/881
[STORM-1208] Guard against NPE, and avoid using NaN values
* Removes malformed preconditions that don't do anything, and if they did
work would throw Errors that would crash nimbus.
* When reading and writing average-type metrics, use `0` instead of `NaN`
* Avoid NPE accessing some maps by doing `(get m k)` instead of `(m k)`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/d2r/storm storm-1208-ui-npe-nan
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/storm/pull/881.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 #881
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commit 3857644b4c459cbe42b78ca8a13bd55ef704fd30
Author: Derek Dagit <der...@yahoo-inc.com>
Date: 2015-11-16T20:15:15Z
Guard against NPE, and avoid using NaN values
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