dfs "du" shows that the size of a subdirectory is 0
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Key: HADOOP-909
URL: https://issues.apache.org/jira/browse/HADOOP-909
Project: Hadoop
Issue Type: Bug
Components: dfs
Affects Versions: 0.10.1
Reporter: Hairong Kuang
dfs "du" is implemented by sending a listPaths request to the namenode to get
the size of each file/subdir under the directory. At the namenode side, the
size of subdir was calculated by recursively going through the whole subtree
with the subdir as the root. But starting from the release 0.10.0, the size of
subdir is no longer gets calculated. So dfs "du" shows its size as 0.
The problem is that both "du" and "list" send the same request "listPaths" to
the namenode. The previous implmentation made list very expensive, but the
current implementation makes du not working.
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