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https://issues.apache.org/jira/browse/HDFS-16382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17459017#comment-17459017
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Ayush Saxena commented on HDFS-16382:
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Ahh, this looks like an invalid use case itself. Mount targets shouldn't
overlap like this. I don't think you can do anything here, fix this mount table.
you mount /A/B to ns1 /A itself, then in that case it might lead to even more
weird things with other RPC calls as well
> Router getContentSummary rpc compute sub-directory repeatedly
> -------------------------------------------------------------
>
> Key: HDFS-16382
> URL: https://issues.apache.org/jira/browse/HDFS-16382
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: rbf
> Affects Versions: 3.3.1
> Reporter: zhanghaobo
> Priority: Major
>
> Router getContentSummary rpc compute sub-directory repeatedly when a
> direactory and its ancestor directory are both mounted in the form of
> original src path.
> For example, suppose we have mount table entries below:
> /A---ns1---/A
> /A/B—ns1,ns2—/A/B
> we put a file test.txt to directory /A/B in namepsace ns1, then execute `hdfs
> dfs -count hdfs://router:8888/A`, the result is wrong, because we compute
> /A/B/test.txt repeatedly
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