[
https://issues.apache.org/jira/browse/HDFS-5088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13737610#comment-13737610
]
Steve Loughran commented on HDFS-5088:
--------------------------------------
What could be done is get the class, not cast it, but instead call
{{FileSystem.concat()}}, expecting an {{UnsupportedOperationException}} if it
isn't implemented, and downgrade that to an {{exit(-1)}}. That way: FS
independent, and fails with some meaningful message. If anyone did ever
implement concat on other filesystems, then it could get used.
Even so, it is {{HDFSConcat}} for a reason: there is no expectation that it
works elsewhere
> Exception in thread "main" java.lang.ClassCastException:occurs when running
> java org.apache.hadoop.hdfs.tools.HDFSConcat
> -------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-5088
> URL: https://issues.apache.org/jira/browse/HDFS-5088
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Environment: Fedora 19, 16 bit
> Reporter: Leo
>
> When I run this command,
> java org.apache.hadoop.hdfs.tools.HDFSConcat
> I get the following exception
> Exception in thread "main" java.lang.ClassCastException:
> org.apache.hadoop.fs.LocalFileSystem cannot be cast to
> org.apache.hadoop.hdfs.DistributedFileSystem
> at org.apache.hadoop.hdfs.tools.HDFSConcat.main(HDFSConcat.java:46)
> It's because that the default fs is localfs instead of hdfs.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
