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https://issues.apache.org/jira/browse/HDFS-5088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13737064#comment-13737064
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Steve Loughran commented on HDFS-5088:
--------------------------------------
There's not that much that can be done here other than restrict the concat
operation to HDFS, because localfs doesn't support merging of files this way
-which is a fairly low-level operation, more than just a {{cat}} operation.
> 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.
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