Max Xie created HDFS-16954:
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Summary: RBF: The operation of renaming a multi-subcluster
directory to a single-cluster directory should throw ioexception
Key: HDFS-16954
URL: https://issues.apache.org/jira/browse/HDFS-16954
Project: Hadoop HDFS
Issue Type: Bug
Components: rbf
Affects Versions: 3.4.0
Reporter: Max Xie
The operation of renaming a multi-subcluster directory to a single-cluster
directory may cause inconsistent behavior of the file system. This operation
should throw exception to be reasonable.
Examples are as follows:
1. add hash_all mount point `hdfs dfsrouteradmin -add /tmp/foo
subcluster1,subcluster2 /tmp/foo -order HASH_ALL`
2. add mount point `hdfs dfsrouteradmin -add /user/foo subcluster1
/user/foo`
3. mkdir dir for all subcluster. ` hdfs dfs -mkdir /tmp/foo/123 `
4. check dir and all subclusters will have dir `/tmp/foo/123`
`hdfs dfs -ls /tmp/foo/` : will show dir `/tmp/foo/123`;
`hdfs dfs -ls hdfs://subcluster1/tmp/foo/` : will show dir
`hdfs://subcluster1/tmp/foo/123`;
`hdfs dfs -ls hdfs://subcluster2/tmp/foo/` : will show dir
`hdfs://subcluster2/tmp/foo/123`;
5. rename `/tmp/foo/123` to `/user/foo/123`. The op will succeed. `hdfs dfs -mv
/tmp/foo/123 /user/foo/123 `
6. check dir again, rbf cluster still show dir `/tmp/foo/123`
`hdfs dfs -ls /tmp/foo/` : will show dir `/tmp/foo/123`;
`hdfs dfs -ls hdfs://subcluster1/tmp/foo/` : will no dirs;
`hdfs dfs -ls hdfs://subcluster2/tmp/foo/` : will show dir
`hdfs://subcluster2/tmp/foo/123`;
The step 5 should throw exception.
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