[GitHub] [ozone] GlenGeng edited a comment on pull request #2295: HDDS-5284. [SCM-HA] SCM start failed with PipelineNotFoundException.

[GitBox <gi...@apache.org>]

GlenGeng edited a comment on pull request #2295:
URL: https://github.com/apache/ozone/pull/2295#issuecomment-852861653


   `PipelineManager.closePipeline()` will be called from `DeadNodeHandler`, `StaleNodeHandler`, `PipelineActionHandler` from `EventHandler` and `PipelineManagerV2Impl.scrubPipeline()` from `BackgroundPipelineCreator`.
   
   `PipelineManager.closePipeline()` will call `stateManager.updatePipelineState()` and `stateManager.removePipeline()` sequentially. 
   
   Thread 1 and thread 2 calling `closePipeline` simultaneously is the root cause of the contention, and the consequence is PipelineNotFoundException.
   
   I haven't figured out a possible fix, since synchronizing on the pipeline object cannot solve the remove case.


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