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https://issues.apache.org/jira/browse/HDFS-9462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15605822#comment-15605822
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Xiaobing Zhou commented on HDFS-9462:
-------------------------------------
v004 patch is posted:
1. fixed javadoc
2. added source/dest volume info (e.g. id, storage type and base path), which
are used by scan command.
> DiskBalancer: Add Scan Command
> ------------------------------
>
> Key: HDFS-9462
> URL: https://issues.apache.org/jira/browse/HDFS-9462
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: balancer & mover
> Affects Versions: 2.8.0
> Reporter: Xiaobing Zhou
> Assignee: Xiaobing Zhou
> Attachments: HDFS-9462-HDFS-10576.001.patch,
> HDFS-9462-HDFS-1312.000.patch, HDFS-9462.002.patch, HDFS-9462.003.patch,
> HDFS-9462.004.patch
>
>
> This is to propose being able to scan all the nodes that we send various
> plans to. In order to do the scan, scan command will talk to all involved
> data nodes through cluster interface(HDFS-9449) and data models(HDFS-9420)
> and compare the hash tag that it gets back to make sure that the plan is that
> we are interested in and print out the results.
> As bonus, it should support the ability to print out the diff of what
> happened when a DiskBalancer run is complete. Assuming the state of the
> cluster is saved to file before.json. There should be two kinds of diffs:
> 1. Overall what happened in the cluster vs. before.json -- just a summary
> 2. for a specific node -- just like report command we should be able to pass
> in a node and as see the changes against the before.json
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