Issue1202 boekabart #1645
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Issue1202 boekabart #1645
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Is that a racy test or should I look into it? |
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This was referenced Jan 14, 2016
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The test that failed initially might have been one of the racy Akka.Persistence tests that we know about - so no worries. However, could you please squash and rebase your commits? The steps for doing this are covered inside |
Changed fix for better consistency/comparability with the code just above Added unit test for 2 types of removals that used to return an unbalanced tree.
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Merging this, thanks! |
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This fixes #1202 which was caused by Remove sometimes returning an unbalanced tree. This happened in after the 'core' remove, node X became unbalanced, and either X.L.R was higher than X.L.L or X.R.L was higher than X.R.R .
This has been reproduced in 2 unit tests.
Mostly this would not lead to a problem: a next remove or add would fix it, but in some cases (haven't been able to reproduce in a Unit Test, though) doing adds close to this tree (not to the tree itself!) would lead to a NullReferenceException when Rotating the now-unbalanced tree.
The fix is trivial: DoubleRotate should be done when the tree-after-remove is left (resp right) heavy - not only when it's left/right imbalanced. The helper functions were incorrectly named.