Julie Tibshirani created LUCENE-10564:
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Summary: SparseFixedBitSet#or doesn't update memory accounting
Key: LUCENE-10564
URL: https://issues.apache.org/jira/browse/LUCENE-10564
Project: Lucene - Core
Issue Type: Bug
Reporter: Julie Tibshirani
While debugging why a cache was using way more memory than expected, one of my
colleagues noticed that {{SparseFixedBitSet#or}} doesn't update
{{{}ramBytesUsed{}}}. Here's a unit test that demonstrates this:
{code:java}
public void testRamBytesUsed() throws IOException {
BitSet bitSet = new SparseFixedBitSet(1000);
long initialBytesUsed = bitSet.ramBytesUsed();
DocIdSetIterator disi = DocIdSetIterator.all(1000);
bitSet.or(disi);
assertTrue(bitSet.ramBytesUsed() > initialBytesUsed);
}
{code}
It also looks like we don't have any tests for {{SparseFixedBitSet}} memory
accounting (unless I've missed them!) It'd be nice to add more coverage there
too.
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