This is the release notes of v0.9.0rc3. See here for the complete list of solved issues and merged PRs.

New Features

Tensor
- Implementing Ellipsoidal Harmonics Functions (#2891, thanks @shantam-8!)
Services
- Support worker meta service (#2909)
- Basic Ray execution backend (#2921)

Enhancements

Add execution API to enable custimization of Mars Task Service (#2894)
Optimize serialization performance (#2914)
Skip adding band in meta when fetch shuffle data (#2922)
Store complete meta on worker and update supervisor meta via fetching from workers (#2912)
Use cython to accelerate core serialization (#2924)
Refine lifecycle api to support incref or decref with ref counts (#2926)
Ignore fetch operands when assign initial nodes (#2929)
Use cython to accelerate message serialization (#2932)
Ignore broadcaster's locality when assign subtasks (#2943)
Allow spawning serialization to threads for large objects (#2944)
Add metrics and event report for Ray channels (#2936)
Add more logs about execution info (#2940)
Add support for dask.persist (#2953, thanks @loopyme!)
Remove should_be_monotonic property (#2949)
Add metrics on operand and subtask executions (#2947, thanks @zhongchun!)
[Ray] optimize ray fetcher by query in remote node (#2957)
Improve deploy backend (#2958)
Support reporting tile progress (#2954)
Add logic key for tileable graph (#2961, thanks @zhongchun!)
[Ray] Loads the subtask inputs from meta (#2976)
New ExecutionConfig API (#2968)
Fix speculative execution compatibility with coloring (#2995)
Make functions that may take long run in thread for lifecycle tracker (#2992)
Optimize metric configs (#2996, thanks @zhongchun!)
Expand the ability of resource evaluator (#2997, thanks @zhongchun!)
Optimize gen subtask graph (#3004)
[Ray] Ray execution state (#3002)

Fix paramter issue of worker actor pool (#2911, thanks @zhongchun!)
Fix default config to ensure storage backends configured (#2935)
Wrap errors in operand execution to protect scheduling service (#2964)
Fix dtype of series result for DataFrame.apply (#2978)
Fix potential data leak for shuffle tasks (#2975)
Fix potential empty chunks when creating DataFrame from pandas (#2987)
[Ray] Support new ray cluster through ray client (#2981)
Fix missing extra_params when constructing operands (#2999)
Fix msg_to_simple_str in Ray backend and add tests (#3003)
Fix incorrect result for df.sort_values when specifying multiple ascending (#2984)