v0.9.0b2

This is the release notes of v0.9.0b2. See here for the complete list of solved issues and merged PRs.

New Features

• Metric
  • Add metric framework (#2742, thanks @zhongchun!)
  • Add prometheus metric implementation (#2752, thanks @zhongchun!)
  • Add ray metrics implementation (#2749, thanks @zhongchun!)
  • Add common metrics (#2760, thanks @zhongchun!)

Enhancements

• Simplify rechunk implementation (#2745)
• Stop inferring outputs when args provided (#2759)
• Add broadcast merge support for DataFrame (#2772)
• Remove deprecate warnings when import mars.tensor (#2788)
• Optimize in-process actor calls (#2763)
• [ray] New ray actor creation model (#2783)

Bug fixes

• Fix duplicate dec object ref (#2741, thanks @Catch-Bull!)
• Fix long exception of asyncio.gather (#2748)
• Fix NameError: name 'pq' is not defined if pyarrow is not installed (#2751)
• Fix profiling band_subtasks and most_calls are empty if the slow duration is large (#2755)
• Fix the wrong result of df.merge (#2774)
• Fix DataFrame initializer when Mars object exists in list (#2770)
• [ray] support ray client mode (#2773)

Tests

• Increase test stability for command-line tests (#2779)