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https://issues.apache.org/jira/browse/HDFS-17134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17748598#comment-17748598
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ASF GitHub Bot commented on HDFS-17134:
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zhangshuyan0 opened a new pull request, #5900:
URL: https://github.com/apache/hadoop/pull/5900
### Description of PR
The result of `getListing` in NameNode are sorted based on `byte[]`, while
the Router side is based on `String`. If there are special characters in path,
the sorting result of the router will be inconsistent with the namenode. This
may result in duplicate `getListing` results obtained by the client due to
wrong `startAfter` parameter.
For exemple, namenode returns [path1, path2, path3] for a `getListing`
request, while router returns [path1, path3, path2] to client. Then client will
pass `path2` as `startAfter` at the next iteration, so it will receive `path3`
again.
We need to fix the Router code so that the order of its result is the same
as NameNode.
### How was this patch tested?
Add a new unit test.
> RBF: Fix duplicate results of getListing through Router.
> --------------------------------------------------------
>
> Key: HDFS-17134
> URL: https://issues.apache.org/jira/browse/HDFS-17134
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Shuyan Zhang
> Assignee: Shuyan Zhang
> Priority: Major
>
> The result of `getListing` in NameNode are sorted based on `byte[]`, while
> the Router side is based on `String`. If there are special characters in
> path, the sorting result of the router is inconsistent with the namenode.
> This may result in duplicate `getListing` results obtained by the client due
> to wrong `startAfter` parameter.
> For exemple, namenode returns [path1, path2, path3], while router returns
> [path1, path3, path2] to client. Then client will pass `startAfter` as
> `path2` at the next iteration, so it will receive `path3` again.
> We need to fix the Router code so that the order of its results is the same
> as NameNode.
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