Files
bitcoin/src/index
fanquake 5abbc9afec Merge bitcoin/bitcoin#24832: index: Verify the block filter hash when reading the filter from disk.
e734228d85 Update GCSFilter benchmarks (Calvin Kim)
aee9a8140b Add GCSFilterDecodeSkipCheck benchmark (Patrick Strateman)
299023c1d9 Add GCSFilterDecode and GCSBlockFilterGetHash benchmarks. (Patrick Strateman)
b0a53d50d9 Make sanity check in GCSFilter constructor optional (Patrick Strateman)

Pull request description:

  This PR picks up the abandoned #19280

  BlockFilterIndex was depending on `GolombRiceDecode()` during the filter decode to sanity check that the filter wasn't corrupt. However, we can check for corruption by ensuring that the encoded blockfilter's hash matches up with the one stored in the index database.

  Benchmarks that were added in #19280 showed that checking the hash is much faster.

  The benchmarks were changed to nanobench and the relevant benchmarks were like below, showing a clear win for the hash check method.

  ```
  |             ns/elem |              elem/s |    err% |        ins/elem |       bra/elem |   miss% |     total | benchmark
  |--------------------:|--------------------:|--------:|----------------:|---------------:|--------:|----------:|:----------
  |              531.40 |        1,881,819.43 |    0.3% |        3,527.01 |         411.00 |    0.2% |      0.01 | `DecodeCheckedGCSFilter`
  |          258,220.50 |            3,872.66 |    0.1% |    2,990,092.00 |     586,706.00 |    1.7% |      0.01 | `DecodeGCSFilter`
  |           13,036.77 |           76,706.09 |    0.3% |       64,238.24 |         513.04 |    0.2% |      0.01 | `BlockFilterGetHash`
  ```

ACKs for top commit:
  mzumsande:
    Code Review ACK e734228d85
  theStack:
    Code-review ACK e734228d85
  stickies-v:
    ACK e734228d85
  ryanofsky:
    Code review ACK e734228d85, with caveat that I mostly paid attention to the main code, not the changes to the benchmark. Only changes since last review were changes to the benchmark code.

Tree-SHA512: 02b86eab7b554e1a57a15b17a4d6d71faa91b556c637b0da29f0c9ee76597a110be8e3b4d0c158d4cab04af0623de18b764837be0ec2a72afcfe1ad9c78a83c6
2022-07-07 17:59:02 +01:00
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