xiaoyuyao opened a new pull request #585: HDDS-1138. Ozone Client should avoid 
talking to SCM directly
URL: https://github.com/apache/hadoop/pull/585
 
 
   This PR is build based on @mukul1987 's initial patch to optimize write path 
only.
   
   The difference are
   * persist pipeline info into OM keylocation metadata
   * support both read and write without client talking to scm
   * There are limitations in this PR when the pipeline changes at SCM side. I 
will send additional code changes to support refresh pipeline info for read. 
(Basic idea documented in the 2nd commits). 

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