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https://issues.apache.org/jira/browse/HDFS-10276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15239233#comment-15239233
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Kevin Cox commented on HDFS-10276:
----------------------------------
I have tested on two moderately recent versions of hadoop and the following
commands will reproduce the issue. The chmod is unnecessary in most cases but I
have included it just to be sure. The following outputs are on a HDFS. When run
on a local path
{code}
% hdfs version
Hadoop 2.7.2
Subversion https://git-wip-us.apache.org/repos/asf/hadoop.git -r
b165c4fe8a74265c792ce23f546c64604acf0e41
Compiled by jenkins on 2016-01-26T00:08Z
Compiled with protoc 2.5.0
>From source with checksum d0fda26633fa762bff87ec759ebe689c
This command was run using
/usr/local/Cellar/hadoop/2.7.2/libexec/share/hadoop/common/hadoop-common-2.7.2.jar
% hdfs --config hadoop dfs -put <(echo "test") /test
2016-04-13 09:24:58,851 WARN [main] util.NativeCodeLoader
(NativeCodeLoader.java:<clinit>(62)) - Unable to load native-hadoop library for
your platform... using builtin-java classes where applicable
hdfs --config hadoop dfs -put <(echo "test") /test 2.74s user 0.21s system
180% cpu 1.638 total
% hdfs --config hadoop dfs -chmod 777 /test
2016-04-13 09:25:11,737 WARN [main] util.NativeCodeLoader
(NativeCodeLoader.java:<clinit>(62)) - Unable to load native-hadoop library for
your platform... using builtin-java classes where applicable
% hdfs --config hadoop dfs -cat /test/bar
2016-04-13 09:25:18,905 WARN [main] util.NativeCodeLoader
(NativeCodeLoader.java:<clinit>(62)) - Unable to load native-hadoop library for
your platform... using builtin-java classes where applicable
cat: `/test/bar': No such file or directory
% hdfs --config hadoop dfs -cat file:///home/kevincox/test/foo
2016-04-13 09:29:34,150 WARN [main] util.NativeCodeLoader
(NativeCodeLoader.java:<clinit>(62)) - Unable to load native-hadoop library for
your platform... using builtin-java classes where applicable
cat: `file:///Users/kevincox/test/foo': No such file or directory
{code}
This isn't a huge issue for the command line client because it returns the same
exit code but in particular for the {{FileSystem.exists()}} method this is the
difference between returning false and throwing an error.
> Different results for exist call for file.ext/name
> --------------------------------------------------
>
> Key: HDFS-10276
> URL: https://issues.apache.org/jira/browse/HDFS-10276
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Kevin Cox
> Assignee: Yuanbo Liu
>
> Given you have a file {{/file}} an existence check for the path
> {{/file/whatever}} will give different responses for different
> implementations of FileSystem.
> LocalFileSystem will return false while DistributedFileSystem will throw
> {{org.apache.hadoop.security.AccessControlException: Permission denied: ...,
> access=EXECUTE, ...}}
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