szetszwo opened a new pull request, #4424:
URL: https://github.com/apache/ozone/pull/4424

   ## What changes were proposed in this pull request?
   
   OM rocksdb uses a lot of space.
   
   This PR adds a cache in RDBBatchOperation for caching the put ops.  When 
there are multiple ops with the same key, it will overwrite the previous op in 
the cache so the previous op won't be written into RocksDB.  In a test, the 
cache can reduce the a single upload of 1000 parts from 755MB to 23MB.
   
   ## What is the link to the Apache JIRA
   
   https://issues.apache.org/jira/browse/HDDS-8128
   
   ## How was this patch tested?
   
   The is an optimization.  The existing test already has covered.  Also have 
tested this with 
https://github.com/apache/ozone/compare/ozone-1.3...szetszwo:ozone:multipartUpload
 manually.


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