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Building on a local machine with ubuntu linux six-core i5 Coffee Lake and 64Gb Ram ($ mvn clean install -DskipTests):

Master branch build time:06:52 min
Feature branch HDDS-4440-s3-performance build time: 06:16 min


9. possible incompatible changes: 

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To enable this feature set,

  1. ozone.om.s3.grpc.server_enabled set to true in ozone-site.xml. (enable service on om)
  2. ozone.om.transport.class set to org.apache.hadoop.ozone.om.protocolPB.GrpcOmTransportFactory in ozone-site.xml. (enable Grpc on s3g client)

With these two configuration keys disabled, the s3 gateway <-> ozone manager channel operates in legacy mode with the existing Hadoop RPC.  This can used in the upgrade period to turn off the feature when the feature is unstable and operate in legacy mode (Hadoop RPC communication).

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