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https://issues.apache.org/jira/browse/HDFS-9420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15012784#comment-15012784
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Anu Engineer commented on HDFS-9420:
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[~szetszwo] Thanks for the comments, I will fix both of them in the next update.
bq. What is the Json code for?
It allows us to persist the nodes information. It is used for 2 things.
1. It is useful for reporting what changed in a cluster. We log the state of
nodes before the start of a run, and we can effectively diff the cluster state
after the disk balancer run.
2. This is also intended to be a useful debugging tool -- if users run into
issues, we might be able to reproduce many of those issues from the json files
that disk balancer produces.
> 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
>
>
> 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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