apache/datasketches-java

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A software library of stochastic streaming algorithms, a.k.a. sketches.

Stars: 958
Forks: 226
Open beginner issues: 1
Indexed issues: 9
Avg merge: 3d 40m
Merged PRs (30d): 13

Dominant language: Java
License: Apache-2.0
Last GitHub push: Sep 17, 2026
Latest indexed: Sep 14, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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KllItemsSketch: querying before serialization corrupts the round-tripped sorted view Closed

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

apache/datasketches-java#756 · 1 comment · Opened Aug 30, 2026
can we use stable sort for tdigest Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

apache/datasketches-java#739 · 1 comment · Opened Jul 9, 2026
Add proper module name in Manifest Open

Difficulty 2/5 1-3 hours Newbie friendliness 65/100

apache/datasketches-java#731 · 16 comments · Opened Apr 1, 2026
How CpcSketch's CompressionData gets generated? Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

apache/datasketches-java#720 · 3 comments · Opened Jan 29, 2026
Question: How do we ensure `TDigest::merge` never causes numCentroids over centroidsCapacity and thus index out of bound? Closed

Difficulty 4/5 3-5 days Newbie friendliness 25/100

apache/datasketches-java#703 · 8 comments · Opened Dec 18, 2025
Compress TDigest can generate centroid with NaN mean Closed

Difficulty 3/5 1-2 days Newbie friendliness 52/100

apache/datasketches-java#702 · 4 comments · Opened Dec 17, 2025
Non-deterministic result when merging an empty KllFloatsSketch with two others Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

apache/datasketches-java#693 · 13 comments · Opened Nov 21, 2025
Reservoir sampling improvements Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

apache/datasketches-java#647 · 5 comments · Opened Feb 3, 2025
The Java Hash functions and possibly other functions, need to be more centralized, e.g., in DS-java-common. Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

apache/datasketches-java#569 · Opened Jun 3, 2024

apache/datasketches-java

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