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Subject [GitHub] [hadoop] steveloughran commented on pull request #2349: MAPREDUCE-7282. Move away from V2 commit algorithm
Date Thu, 01 Oct 2020 13:32:35 GMT

steveloughran commented on pull request #2349:
URL: https://github.com/apache/hadoop/pull/2349#issuecomment-702137474


   @jbrennan333 what do you think we should say instead of deprecated? "not recommended".

   
   I was thinking of adding a link to the JIRA and changing the issue text there to clarify
   * safe if names and content of generated output files is consistent across all task attempts
   * unsafe if different TAs generate bad files (biggest risk, as partial failure of 1st attempt
may leave)
   * unsafe if different TAs generate different content in same files (only an issue on a
network partition and TA #1 generates output as/after TA #2 does its work.
   
   cleanup of job will delete the whole job attempt dir so that's the maximum time that a
partitioned TA may commit work. There's no risk of some VM pausing for 3 hours, restarting
and an in progress TA completing its work and overwriting the final output. This is good.
   
   
   
   


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