WEAVIATE-62 Remove obsolete hnsw files #1875
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The following situation caused an issue. Imagine there are two commit logs in chronological order: Log 1: - AddLink for Node/Level/Link 0/0/1 - AddLink for Node/Level/Link 0/0/2 Log 2: - ClearLinks for Node/Level 0/0 - AddLink for Node/Level/Link 0/0/3 - AddLink for Node/Level/Link 0/0/4 It should be quite obvious that after reading all the logs back in the correct order node 0 will have the connections [3,4] at level zero, as there was a "clear" event in between. However, prior to this fix we would have ended up with [1,2,3,4] because the clear information got lost when condensing each log independently. This fix makes sure that information that relates to changes from prior commit logs is kept when condensing a commit log. The actual bug was when reading (as part of condensing) as we used the clear only to clear the links (which from the perspective of log 2 were already empty). This led us to condensing log 2 to just "add 3, add 4", whereas the correctly condensed log would have been "clear, add 3, add 4". This is the case now. To write the tests needed for this fix, it was required to add some functional options to the commit logger to control the commit log size thresholds. As of now these are not yet exposed to the user, but this would also add value. fixes #1868 Potential follow-up tasks: 1. Expose Commitlog configuration (e.g. thresholds) to user, so they can finetune them to their needs 2. Clean up the redundant and partly unused code, and the confusion between condensor/condensor2 and deserializer/deserializer2
etiennedi
changed the title
Codecov Report
@@ Coverage Diff @@
## master #1875 +/- ##
==========================================
+ Coverage 66.27% 66.81% +0.53%
==========================================
Files 415 416 +1
Lines 31433 31482 +49
==========================================
+ Hits 20833 21035 +202
+ Misses 8792 8635 -157
- Partials 1808 1812 +4
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This should also fix the flaky test seen on this PR's CI
This contains the fixes for the flaky test in the branch this branch is based off of.
antas-marcin
approved these changes
Mar 24, 2022
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WARNING: This is branched off of the #1868 branch. I'd recommend reviewing and merging #1871 first, as it will only then become clear what changes are actually from this branch
WEAVIATE-62