fix: handle zero bucket counts in ExponentialHistogram merge #4459
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Additional details and impacted files@@ Coverage Diff @@
## main #4459 +/- ##
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+ Coverage 92.41% 92.42% +0.01%
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Files 330 330
Lines 9514 9516 +2
Branches 2028 2029 +1
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+ Hits 8792 8795 +3
+ Misses 722 721 -1
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pichlermarc
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Feb 5, 2024
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Wow, that's a tricky one! Thanks for doing the investigation and coming up with a fix so quickly @mwear 🙂
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…elemetry#4459) Co-authored-by: Marc Pichler <marc.pichler@dynatrace.com>
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Which problem is this PR solving?
This PR fixes a bug in the exponential histogram merge operation where the source histogram has empty bucket counts. The bucket index was not being set properly in this case, and depending on the histogram being merged, it can lead to corrupted counts in the resulting histogram.
Fixes #4450
Short description of the changes
Added special case handling for the zero-length bucket counts case in the
_incrementIndexBymethod.Type of change
Please delete options that are not relevant.
How Has This Been Tested?
Added a unit test that replicates a real world failure that exhibits this issue. If you comment out the changes added to
_incrementIndexByyou will see the newly added test fail.Checklist: