docid deltas while indexing #2249
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storing deltas is especially helpful for repetitive data like logs. In those cases, recording a doc on a term costed 4 bytes instead of 1 byte now. HDFS Indexing 1.1GB Total memory consumption: Before: 760 MB Now: 590 MB
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src/postings/recorder.rs
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| VInt32Reader::new(&buffer[..]) | ||
| .map(|old_doc_id| doc_id_map.get_new_doc_id(old_doc_id)), | ||
| ); | ||
| doc_ids.extend(VInt32Reader::new(&buffer[..]).map(|delta_doc_id| { |
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Usage of prev_doc here looks like scan instead of map could make this more obvious.
fulmicoton
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Nov 13, 2023
src/postings/recorder.rs
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| VInt32Reader::new(&buffer[..]) | ||
| .map(|old_doc_id| doc_id_map.get_new_doc_id(old_doc_id)), | ||
| ); | ||
| doc_ids.extend(VInt32Reader::new(&buffer[..]).map(|delta_doc_id| { |
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- 1 in favor of scan of a loop.
Having prev_doc outside of the if-statement is not a good idea. Having it in both statement makes the code easier to (proof)read.
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switched to scan, but we can't apply the same technique in the other cases, because they contain a mix of delta and non delta encoded values
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* docid deltas while indexing storing deltas is especially helpful for repetitive data like logs. In those cases, recording a doc on a term costed 4 bytes instead of 1 byte now. HDFS Indexing 1.1GB Total memory consumption: Before: 760 MB Now: 590 MB * use scan for delta decoding
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storing deltas is especially helpful for repetitive data like logs.
In those cases, recording a doc on a term costed 4 bytes instead of 1
byte now.
HDFS Indexing 1.1GB Total memory consumption:
Before: 760 MB
Now: 590 MB