[jira] [Created] (LUCENE-10564) SparseFixedBitSet#or doesn't update memory accounting

["Julie Tibshirani (Jira)" <ji...@apache.org>]

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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