[GitHub] [incubator-uniffle] jerqi commented on pull request #55: [Feature][MR] Support remote spill

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

jerqi commented on PR #55:
URL: https://github.com/apache/incubator-uniffle/pull/55#issuecomment-1184538911

   > ### What changes were proposed in this pull request?
   > Rewrite Mapreduce's MergerManager to spill sorted segments to HDFS, It returns a merge-sorted iterator to read these HDFS segments.
   > 
   > ### Why are the changes needed?
   > In cloud, machines may have very limited disk space and performance. This PR allows to spill data to remote storage (e.g., hdfs)
   > 
   > ### Does this PR introduce _any_ user-facing change?
   > Yes. rss.reduce.remote.spill.enable (default false)
   > 
   > ### How was this patch tested?
   > New UT and IT with remote spill.
   > 
   > Co-authored-by: roryqi [roryqi@tencent.com](mailto:roryqi@tencent.com)
   
   Because this pr will introduce user-facing change. We should update doc.
   And we should supply the performance test results.


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