Han Jiang created LUCENE-4283:
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Summary: Support more frequent skip with Block Postings Format
Key: LUCENE-4283
URL: https://issues.apache.org/jira/browse/LUCENE-4283
Project: Lucene - Core
Issue Type: Improvement
Reporter: Han Jiang
Priority: Minor
This change works on the new bulk branch.
Currently, our BlockPostingsFormat only supports skipInterval==blockSize. Every
time the skipper reaches the last level 0 skip point, we'll have to decode a
whole block to read doc/freq data. Also, a higher level skip list will be
created only for those df>blockSize^k, which means for most terms, skipping
will just be a linear scan. If we increase current blockSize for better bulk
i/o performance, current skip setting will be a bottleneck.
For ForPF, the encoded block can be easily splitted if we set
skipInterval=32*k.
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