[GitHub] [hadoop-ozone] timmylicheng opened a new pull request #291: HDDS-1574 Average out pipeline allocation on datanodes and add metrcs/test

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timmylicheng opened a new pull request #291: HDDS-1574 Average out pipeline allocation on datanodes and add metrcs/test
URL: https://github.com/apache/hadoop-ozone/pull/291
 
 
   ## What changes were proposed in this pull request?
   1. Fix pipeline allocation in non-topology env and prevent pipelines from sharing the same set of datanodes.
   2. Add metrics and logs to record when pipeline policy chooses two same set of datanodes for different pipeline for future reference.
   3. Add tests for basic reports and mock what pipeline allocation would do given different number of nodes.
   
   (Please fill in changes proposed in this fix)
   
   ## What is the link to the Apache JIRA
   
   https://issues.apache.org/jira/browse/HDDS-1574
   (Please create an issue in ASF JIRA before opening a pull request,
   and you need to set the title of the pull request which starts with
   the corresponding JIRA issue number. (e.g. HDDS-XXXX. Fix a typo in YYY.)
   
   Please replace this section with the link to the Apache JIRA)
   
   ## How was this patch tested?
   UT 
   
   (Please explain how this patch was tested. Ex: unit tests, manual tests)
   (If this patch involves UI changes, please attach a screen-shot; otherwise, remove this)
   

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