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From "Anu Engineer (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11564) Ozone: SCM: Add Comparable Metric Support
Date Wed, 22 Mar 2017 21:39:41 GMT
Anu Engineer created HDFS-11564:
-----------------------------------

             Summary: Ozone: SCM: Add Comparable Metric Support
                 Key: HDFS-11564
                 URL: https://issues.apache.org/jira/browse/HDFS-11564
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: ozone
    Affects Versions: HDFS-7240
            Reporter: Anu Engineer


While picking the datanode or the pool to place a container, SCM needs to be able to compare
pools and datanodes. This jira proposes to add a Comparable Metric interface from which DatanodeCapacity
and DatanodeIOLoad metrics can be derived. This will also convert SCM Container Placement
Capacity policy to use these metrics.

Adding these metrics makes all placement policy operate on the basis of these metrics and
it makes it easy to simulate cluster imbalances as well as reason about code. All new SCM
metrics which have the property of total ordering should be derived from this interface.



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