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Posted to hdfs-dev@hadoop.apache.org by "Anu Engineer (JIRA)" <ji...@apache.org> on 2017/03/22 21:39:41 UTC
[jira] [Created] (HDFS-11564) Ozone: SCM: Add Comparable Metric
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Anu Engineer created HDFS-11564:
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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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