nandakumar131 opened a new pull request #773: HDDS-3347. PipelineActionHandler 
should handle unknown pipeline.
URL: https://github.com/apache/hadoop-ozone/pull/773
 
 
   PipelineActionHandler is not able to handle PipelineActions for pipelines 
which is not present in SCM (deleted pipelines)
   
   After SCM sends out the close pipeline command to datanodes, it removes the 
pipeline information from the pipeline db. If a datanode sends PipelineAction 
for the deleted pipeline, PipelineActionHandler cannot handle it.
   In such a situation SCM should fire ClosePipelineCommand.
   
   https://issues.apache.org/jira/browse/HDDS-3347
   
   ## How was this patch tested?
   Added a new unit test to cover the scenario.
   

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