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https://issues.apache.org/jira/browse/HDFS-5066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13770825#comment-13770825
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Binglin Chang commented on HDFS-5066:
-------------------------------------
Thanks for the comments Jing Zhao, your concern makes sense.
I also hesitated to add new API in ClientProtocol, but for the running namenode
service, there is few interfaces can be used to invoke the visualization,
another way is through web servlet and add a config to only expose the servlet
when config is enabled.
If we don't expose this tool, it can only be used in debugging unit test.
I made this tool mostly for developers to understand snapshot internal and
debugging, visualization of millions files/directory does not seem possible and
useful(it has way to much information). So I think the options left are expose
web servlet or just left it internal and used by tests.
What do you mean by "make the tool continue the visualization based on the last
time result"? Do you mean a dynamic visualization updates along with fs changes?
> Inode tree with snapshot information visualization
> ---------------------------------------------------
>
> Key: HDFS-5066
> URL: https://issues.apache.org/jira/browse/HDFS-5066
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Binglin Chang
> Assignee: Binglin Chang
> Priority: Minor
> Attachments: HDFS-5066.v1.patch, HDFS-5066.v2.patch, visnap.png
>
>
> It would be nice to be able to visualize snapshot information, in order to
> ease the understanding of related data structures. We can generate graph from
> in memory inode links.
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