sandynz opened a new issue, #20735:
URL: https://github.com/apache/shardingsphere/issues/20735

   Part of #19421.
   
   Currently, on wathcing `/pipeline`, event key will be matched by different 
hard-coded regex, it's not easy to add new node change logic. So it's better to 
extract pipeline meta data node change listener SPI for common usage.
   
   Related code:
   - PipelineJobExecutor.doStart method
   
   We might need to handle process configuration change for migration job and 
other types of jobs in the future. And new type job might need to handle other 
nodes change.
   
   Possible changes:
   - Add pipeline meta data node change listener SPI
   - Add SPI factory
   - Add SPI impl
   - Unit test, etc
   


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