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https://issues.apache.org/jira/browse/HDDS-1569?focusedWorklogId=316001&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-316001
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ASF GitHub Bot logged work on HDDS-1569:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 21/Sep/19 00:22
            Start Date: 21/Sep/19 00:22
    Worklog Time Spent: 10m 
      Work Description: xiaoyuyao commented on pull request #1431: HDDS-1569 
Support creating multiple pipelines with same datanode
URL: https://github.com/apache/hadoop/pull/1431#discussion_r326837652
 
 

 ##########
 File path: 
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/pipeline/SCMPipelineManager.java
 ##########
 @@ -158,6 +158,8 @@ public synchronized Pipeline createPipeline(
       throw idEx;
     } catch (IOException ex) {
       metrics.incNumPipelineCreationFailed();
+      LOG.error("Pipeline creation failed due to exception: "
 
 Review comment:
   This can be changed to: LOG.error("Pipeline creation failed", ex);
    
   
   
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 316001)
    Time Spent: 2h 20m  (was: 2h 10m)

> Add ability to SCM for creating multiple pipelines with same datanode
> ---------------------------------------------------------------------
>
>                 Key: HDDS-1569
>                 URL: https://issues.apache.org/jira/browse/HDDS-1569
>             Project: Hadoop Distributed Data Store
>          Issue Type: Sub-task
>          Components: SCM
>            Reporter: Siddharth Wagle
>            Assignee: Li Cheng
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 2h 20m
>  Remaining Estimate: 0h
>
> - Refactor _RatisPipelineProvider.create()_ to be able to create pipelines 
> with datanodes that are not a part of sufficient pipelines
> - Define soft and hard upper bounds for pipeline membership
> - Create SCMAllocationManager that can be leveraged to get a candidate set of 
> datanodes based on placement policies
> - Add the datanodes to internal datastructures



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