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https://issues.apache.org/jira/browse/HADOOP-5085?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12668685#action_12668685
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Tsz Wo (Nicholas), SZE commented on HADOOP-5085:
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When -crc is specified in the command and the fs does not support crc, the
patch prints a warning, turns off -crc automatically and then continues. I
think we should throw an exception in such case. No?
> Copying a file to local with Crc throws an exception
> ----------------------------------------------------
>
> Key: HADOOP-5085
> URL: https://issues.apache.org/jira/browse/HADOOP-5085
> Project: Hadoop Core
> Issue Type: Bug
> Components: fs
> Reporter: Hairong Kuang
> Assignee: Hairong Kuang
> Fix For: 0.21.0
>
> Attachments: crcChecksum.patch
>
>
> $ hadoop dfs -get -crc /user/aa/test.txt test.txt
> get: org.apache.hadoop.dfs.DistributedFileSystem cannot be cast to
> org.apache.hadoop.fs.ChecksumFileSystem
> The problem seems to be caused by the line 251 in FsShell#copyToLocal:
> {noformat}
> 250; if (copyCrc) {
> 251: ChecksumFileSystem csfs = (ChecksumFileSystem) srcFS;
> ...
> }
> {noformat}
> Copying crc files to local should not require the source file system to be
> ChecksumFileSystem.
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