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https://issues.apache.org/jira/browse/HDFS-9420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15023438#comment-15023438
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Anu Engineer commented on HDFS-9420:
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[~xiaobingo] Thanks for your review. From the disk balancer point of view, we
don't need to locks since only a single thread can operate upon a node's data
at any given point of time.
As for unit tests, I am not aware of any tests which could trigger
multi-threaded issues. I would appreciate if you can flag the specific test(s)
you have in mind so that I can take a closer look.
> DiskBalancer : Add DataModels
> -----------------------------
>
> Key: HDFS-9420
> URL: https://issues.apache.org/jira/browse/HDFS-9420
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: HDFS
> Affects Versions: 2.8.0
> Reporter: Anu Engineer
> Assignee: Anu Engineer
> Attachments: HDFS-9420.001.patch, HDFS-9420.002.patch
>
>
> Adds Data Model classes needed for Disk Balancer. These classes allow us to
> persist the physical model of the cluster. This is needed by the other parts
> of Disk balancer like Planner and Executor engine
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