HDFS-15970. Print network topology on the web#2896

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tasanuma merged 5 commits intoapache:trunkfrom

tomscut:HDFS-15970

Apr 19, 2021

Commits on Apr 12, 2021

HDFS-15970. Print network topology on web
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Commits on Apr 13, 2021

Commits on Apr 16, 2021

support json format
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