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From "Anu Engineer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11564) Ozone: SCM: Add Comparable Metric Support
Date Mon, 03 Apr 2017 19:48:41 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15954065#comment-15954065

Anu Engineer commented on HDFS-11564:

[~xyao] Thanks for the reviews. I will commit this soon. I will fix the checkstyle issue while

> 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
>            Assignee: Anu Engineer
>         Attachments: HDFS-11564-HDFS-7240.001.patch, HDFS-11564-HDFS-7240.002.patch,
HDFS-11564-HDFS-7240.003.patch, HDFS-11564-HDFS-7240.004.patch
> 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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