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Hamilton is a lightweight in-process framework to define, execute, and observe directed acyclic graphs (DAGs) that express data transformations. In Hamilton, one can express complex DAGs of transformations, e.g. from dataframe transformations (using pandas, polars, PySpark), machine learning pipelines, through to regular software engineering API request and LLM API based workflows. Observability hooks are built into the framework. The Hamilton UI is a self-hostable service to capture observability output from workflow runs. Hamilton has been incubating since 2025-04-12. ### Three most important unfinished issues to address before graduating: 1. Get more PPMC comfortable with releases. 2. Add to PPMC 3. Build community ### Are there any issues that the IPMC or ASF Board need to be aware of? No. ### How has the community developed since the last report? Still people joining slack. ### How has the project developed since the last report? More first time contributors. ### How would you assess the podling's maturity? Please feel free to add your own commentary. - [X] Initial setup - [X] Working towards first release - [-] Community building - [ ] Nearing graduation - [ ] Other: ### Date of last release: 2026-07-13 ### When were the last committers or PPMC members elected? N/A ### Have your mentors been helpful and responsive? No answer ### Is the PPMC managing the podling's brand / trademarks? No answer ### Signed-off-by: - [ ] (hamilton) Kevin Ratnasekera Comments: - [X] (hamilton) Ayush Saxena Comments: - [X] (hamilton) PJ Fanning Comments: - [ ] (hamilton) Jarek Potiuk Comments: ### IPMC/Shepherd notes:
Hamilton is a lightweight in-process framework to define, execute, and observe directed acyclic graphs (DAGs) that express data transformations. In Hamilton, one can express complex DAGs of transformations, e.g. from dataframe transformations (using pandas, polars, PySpark), machine learning pipelines, through to regular software engineering API request and LLM API based workflows. Observability hooks are built into the framework. The Hamilton UI is a self-hostable service to capture observability output from workflow runs. Hamilton has been incubating since 2025-04-12. ## Three most important unfinished issues to address before graduating: 1. **Grow reviewer/committer diversity** — Bus factor proxy is 2/3 (50%/75% of commits). Need to cultivate more regular reviewers beyond the core 2-3 maintainers. Reviewer diversity (effective #) is 1.68, which needs improvement. 2. **Establish a regular release cadence** — Two incubating releases to date (v1.89.0 in Oct 2025, v1.90.0 in Apr 2026). Need to demonstrate a sustainable, community-driven release process. 3. **Complete package rename from sf-hamilton to apache-hamilton** — Migration from the legacy `sf-hamilton` PyPI package to `apache-hamilton` is in progress (PR #1561). This is important for brand independence and Apache compliance. ### Are there any issues that the IPMC or ASF Board need to be aware of? No. ### How has the community developed since the last report? - 8 new contributors in the last 3 months - 12 unique PR authors, 7 unique reviewers (sampled) in the 3-month window - 13 unique committers in the last 3 months - dev@ mailing list: 33 messages from 9 unique posters - Active community PRs from external contributors (ddtrace upgrade, datasaver fix, async typing fix, optional extractors feature, docs fixes) - PR activity strong: 97 opened / 72 merged in 3 months, median merge time 8 days ### How has the project developed since the last report? - **Released apache-hamilton v1.90.0-incubating** (April 2026) — second Apache release - Ongoing package rename from `sf-hamilton` to `apache-hamilton` across codebase, docs, and PyPI - Plugin upgrades (Datadog ddtrace 4.x migration) - Bug fixes for `from __future__ import annotations` compatibility - Typing improvements (fluent builder pattern with `Self`) - New feature: optional flag for `from_` data loaders - Dependency maintenance: security bumps for dompurify, django, follow-redirects, protobufjs, vite, lodash - Continued growth in external contributor PRs ### How would you assess the podling's maturity? Please feel free to add your own commentary. - [X] Initial setup - [X] Working towards first release - [X] Community building - [ ] Nearing graduation - [ ] Other: ### Date of last release: 2026-04-25 ### When were the last committers or PPMC members elected? - At founding ### Have your mentors been helpful and responsive? I haven't asked yet, but better docs on docker build guidance would be appreciated. ### Is the PPMC managing the podling's brand / trademarks? Not that we're aware of. ### Signed-off-by: - [ ] (hamilton) Kevin Ratnasekera Comments: - [ ] (hamilton) Ayush Saxena Comments: - [X] (hamilton) PJ Fanning Comments: Need to look at adding extra committers from the active contributors. - [ ] (hamilton) Jarek Potiuk Comments: ### IPMC/Shepherd notes:
Hamilton is a lightweight in-process framework to define, execute, and observe directed acyclic graphs (DAGs) that express data transformations. In Hamilton, one can express complex DAGs of transformations, e.g. from dataframe transformations (using pandas, polars, PySpark), machine learning pipelines, through to regular software engineering API request and LLM API based workflows. Observability hooks are built into the framework. The Hamilton UI is a self-hostable service to capture observability output from workflow runs. Hamilton has been incubating since 2025-04-12. ### Three most important unfinished issues to address before graduating: 1. Release all the packages under Apache. 2. Build release cadance. 3. Build community. ### Are there any issues that the IPMC or ASF Board need to be aware of? N/A ### How has the community developed since the last report? Feels flat-ish. But new contributors keep passing through. ### How has the project developed since the last report? We managed to get our first release out. Otherwise guiding new contributors that want to help with issues. ### How would you assess the podling's maturity? Please feel free to add your own commentary. - [X] Initial setup - [X] Working towards first releases [we've done 1 package, 4 more to go]. - [ ] Community building - [ ] Nearing graduation - [ ] Other: ### Date of last release: 2025-10-09 ### When were the last committers or PPMC members elected? 2025-04-12 ### Have your mentors been helpful and responsive? Are things falling through the cracks? If so, please list any open issues that need to be addressed. All good. Nothing outstanding right now. ### Is the PPMC managing the podling's brand / trademarks? Are 3rd parties respecting and correctly using the podlings name and brand? If not what actions has the PPMC taken to correct this? Has the VP, Brand approved the project name? Not aware of any issues. ### Signed-off-by: - [ ] (hamilton) Kevin Ratnasekera Comments: - [ ] (hamilton) Ayush Saxena Comments: - [X] (hamilton) PJ Fanning Comments: - [ ] (hamilton) Jarek Potiuk Comments: ### IPMC/Shepherd notes:
Hamilton is a lightweight in-process framework to define, execute, and observe directed acyclic graphs (DAGs) that express data transformations. In Hamilton, one can express complex DAGs of transformations, e.g. from dataframe transformations (using pandas, polars, PySpark), machine learning pipelines, through to regular software engineering API request and LLM API based workflows. Observability hooks are built into the framework. The Hamilton UI is a self-hostable service to capture observability output from workflow runs. Hamilton has been incubating since 2025-04-12. ### Three most important unfinished issues to address before graduating: 1. Release other packages under apache process. 2. Train more of PPMC to run a release. 3. Have more releases. ### Are there any issues that the IPMC or ASF Board need to be aware of? N/A ### How has the community developed since the last report? Several new contributors to the repo. ### How has the project developed since the last report? We published our first main package under apache! ### How would you assess the podling's maturity? Please feel free to add your own commentary. - [X] Initial setup - [X] Working towards first release - [X] Community building - [ ] Nearing graduation - [ ] Other: ### Date of last release: 2025-10-11 ### When were the last committers or PPMC members elected? April 2025 ### Have your mentors been helpful and responsive? Are things falling through the cracks? If so, please list any open issues that need to be addressed. We're not a java project, so things aren't as straightforward to release -- which most of the documentation is geared towards. ### Is the PPMC managing the podling's brand / trademarks? Yes -- no 3rd parties with issues. ### Signed-off-by: - [ ] (hamilton) Kevin Ratnasekera Comments: - [ ] (hamilton) Ayush Saxena Comments: - [X] (hamilton) PJ Fanning Comments: ### IPMC/Shepherd notes:
Hamilton is a lightweight in-process framework to define, execute, and observe directed acyclic graphs (DAGs) that express data transformations. In Hamilton, one can express complex DAGs of transformations, e.g. from dataframe transformations (using pandas, polars, PySpark), machine learning pipelines, through to regular software engineering API request and LLM API based workflows. Observability hooks are built into the framework. The Hamilton UI is a self-hostable service to capture observability output from workflow runs. Hamilton has been incubating since 2025-04-12. ### Three most important unfinished issues to address before graduating: 1. Finish check list to be able to make a release 2. Start releasing 3. Enable more contributors ### Are there any issues that the IPMC or ASF Board need to be aware of? ### How has the community developed since the last report? Flat. Slack continues to trickle in. Non PPMC users contributed some code. ### How has the project developed since the last report? 1. We have many merged features that haven't been released. 2. Some PRs were merged for licensing etc. Docs were updated. 3. But still more work needed for first release. ### How would you assess the podling's maturity? Please feel free to add your own commentary. - [X] Initial setup - [ ] Working towards first release <== here - [ ] Community building - [ ] Nearing graduation - [ ] Other: ### Date of last release: N/A ### When were the last committers or PPMC members elected? April 2025 ### Have your mentors been helpful and responsive? Time for the committers has been an issue this summer to get through the checklist required to release under Apache. ### Is the PPMC managing the podling's brand / trademarks? I think so. No issues thus far. ### Signed-off-by: - [ ] (hamilton) Kevin Ratnasekera Comments: - [X] (hamilton) Ayush Saxena Comments: - [X] (hamilton) PJ Fanning Comments: Podling name is approved. We got it approved before setting up ASF resources. ### IPMC/Shepherd notes:
Hamilton is a lightweight in-process framework to define, execute, and observe directed acyclic graphs (DAGs) that express data transformations. In Hamilton, one can express complex DAGs of transformations, e.g. from dataframe transformations (using pandas, polars, PySpark), machine learning pipelines, through to regular software engineering API request and LLM API based workflows. Observability hooks are built into the framework. The Hamilton UI is a self-hostable service to capture observability output from workflow runs. Hamilton has been incubating since 2025-04-12. ### Three most important unfinished issues to address before graduating: 1. Finally publish a release 2. Publish releases of all other components 3. ### Are there any issues that the IPMC or ASF Board need to be aware of? ### How has the community developed since the last report? Organizing a meet-up in July. ### How has the project developed since the last report? Gotten some docs out -- still missing a few ASF things. ### How would you assess the podling's maturity? Please feel free to add your own commentary. - [X] Initial setup - [ ] Working towards first release -- currently here. - [ ] Community building - [ ] Nearing graduation - [ ] Other: ### Date of last release: N/A ### When were the last committers or PPMC members elected? N/A ### Have your mentors been helpful and responsive? N/A ### Is the PPMC managing the podling's brand / trademarks? No answer ### Signed-off-by: - [ ] (hamilton) Kevin Ratnasekera Comments: - [X] (hamilton) Ayush Saxena Comments: - [X] (hamilton) PJ Fanning Comments: ### IPMC/Shepherd notes:
Hamilton is a lightweight in-process framework to define, execute, and observe directed acyclic graphs (DAGs) that express data transformations. In Hamilton one can express complex DAGs of transformations, e.g. from dataframe transformations (using pandas, polars, PySpark), machine learning pipelines, through to regular software engineering API request and LLM API based workflows. Observability hooks are built into the framework. The Hamilton UI is a self- hostable service to captureobservability output from workflow runs. Apache Software Foundation incubation will establish Hamilton as a community-driven standard. Hamilton has been incubating since 2025-04-12. ### Three most important unfinished issues to address before graduating: 1. Finish repo setup. 2. Go through first release process. 3. ### Are there any issues that the IPMC or ASF Board need to be aware of? No ### How has the community developed since the last report? N/A ### How has the project developed since the last report? N/A ### How would you assess the podling's maturity? Please feel free to add your own commentary. - [X] Initial setup - [ ] Working towards first release - [ ] Community building - [ ] Nearing graduation - [ ] Other: ### Date of last release: No apache release yet. ### When were the last committers or PPMC members elected? 2025-04-12 ### Have your mentors been helpful and responsive? No answer. ### Is the PPMC managing the podling's brand / trademarks? Name is approved: https://issues.apache.org/jira/browse/PODLINGNAMESEARCH-235 ### Signed-off-by: - [ ] (hamilton) Kevin Ratnasekera Comments: - [X] (hamilton) Ayush Saxena Comments: In the initial stage: setting up resource & gearing up for the first ASF release - [X] (hamilton) PJ Fanning Comments: ### IPMC/Shepherd notes:
Hamilton is a lightweight declarative python DAG framework with an optional observability solution. Hamilton has been incubating since 2025-05-01. ### Three most important unfinished issues to address before graduating: 1. Get podling resources set up 2. Expand community 3. ### Are there any issues that the IPMC or ASF Board need to be aware of? None ### How has the community developed since the last report? ### How has the project developed since the last report? ### How would you assess the podling's maturity? Please feel free to add your own commentary. - [X] Initial setup - [ ] Working towards first release - [ ] Community building - [ ] Nearing graduation - [ ] Other: ### Date of last release: N/A ### When were the last committers or PPMC members elected? N/A ### Have your mentors been helpful and responsive? N/A ### Is the PPMC managing the podling's brand / trademarks? N?A ### Signed-off-by: - [X] (hamilton) PJ Fanning Comments: Still setting up - [ ] (hamilton) Ayush Saxena Comments: - [ ] (hamilton) Kevin Ratnasekera Comments: ### IPMC/Shepherd notes:
Hamilton is a lightweight declarative python DAG framework with an optional observability solution. Hamilton has been incubating since 2025-05-01. ### Three most important unfinished issues to address before graduating: 1. Get podling resources set up 2. Expand community 3. ### Are there any issues that the IPMC or ASF Board need to be aware of? None ### How has the community developed since the last report? ### How has the project developed since the last report? ### How would you assess the podling's maturity? Please feel free to add your own commentary. - [X] Initial setup - [ ] Working towards first release - [ ] Community building - [ ] Nearing graduation - [ ] Other: ### Date of last release: N/A ### When were the last committers or PPMC members elected? N/A ### Have your mentors been helpful and responsive? N/A ### Is the PPMC managing the podling's brand / trademarks? N?A ### Signed-off-by: - [X] (hamilton) PJ Fanning Comments: Still setting up - [ ] (hamilton) Ayush Saxena Comments: - [ ] (hamilton) Kevin Ratnasekera Comments: ### IPMC/Shepherd notes:
