LUCENE-8599: Use sparse bitset to store docs in SingleValueDocValuesFieldUpdates #522
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jpountz
approved these changes
Dec 10, 2018
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For the record, DocIdSetBuilder needs to sort as well if the number of collected docs is low, but it does it with a pretty fast radix sort. |
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@jpountz I will get this in as is and then explore what we can do as a followup with DocIdSetBuilder. We do need additional stats to make efficient use of it IMO and this already yields a significant improvement. |
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Sure! |
…ieldUpdates Using a sparse bitset in SingleValueDocValuesFieldUdpates allows storing which documents have an update much more efficient and prevents the need to sort the docs array altogether that showed to be a significant bottleneck in LUCENE-8598. Using the spares bitset yields another 10x performance improvement in applying updates versus the changes proposed in LUCENE-8598.
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Using a sparse bitset in SingleValueDocValuesFieldUdpates allows storing
which documents have an update much more efficient and prevents the need
to sort the docs array altogether that showed to be a significant bottleneck
in LUCENE-8598. Using the spares bitset yields another 10x performance improvement
in applying updates versus the changes proposed in LUCENE-8598.