ZanderXu opened a new pull request, #4763:
URL: https://github.com/apache/hadoop/pull/4763
### Description of PR
Suppose there are some mount points as bellows in RBF without default
namespace.
|Source Path|NameSpace|Destination Path |
|:----:|:----:|:----:|
|/a/b|ns0|/a/b|
|/a/b/c|ns0|/a/b/c|
|/a/b/c/d|ns1|/a/b/c/d|
Suppose there a file /a/b/c/file1 with 10MB data in ns0 and a file
/a/b/c/d/file2 with 20MB data in ns1.
There are bugs during handling some cases:
|Case Number|Case|Current Result|Expected Result|
|:---:|:---:|:---:|:---:|
|1|getContentSummary('/a')|Throw RouterResolveException |2files and 30MB
data|
|2|getContentSummary('/a/b')|3files and 40MB data|2files and 30MB data|
Bugs for these cases:
- Case1: If can't find any locations for the path, RBF should try to do it
with sub mount points.
- Case2: RBF shouldn't repeatedly get content summary from one same
namespace with same ancestors path, such as from ns0 with /a/b and from ns0
with /a/b/c.
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