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https://issues.apache.org/jira/browse/HDFS-13661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16716536#comment-16716536
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Takanobu Asanuma commented on HDFS-13661:
-----------------------------------------
[~ayushtkn] Sorry for my late response.
bq. For all other EC operations it would be getting the exception only and I
guess we should be inline with them.
Since other EC operations are hdfs command (not hadoop command), they are in
hadoop-hdfs moudle. They use the following logic.
{code}
if (!(fs instanceof DistributedFileSystem)) {
throw new IllegalArgumentException("FileSystem " + fs.getUri() +
" is not an HDFS file system");
}
{code}
Ls command can't use the logic because it is in hadoop-common and can't see
{{DistributedFileSystem}}.
I looked for other ways, but on client (hadoop-common) sides, I think it is
hard to know whether filesystem supports EC or not unless we create a new API
in FileSystem.
> Ls command with e option fails when the filesystem is not HDFS
> --------------------------------------------------------------
>
> Key: HDFS-13661
> URL: https://issues.apache.org/jira/browse/HDFS-13661
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: erasure-coding, tools
> Affects Versions: 3.1.0, 3.0.3
> Reporter: Takanobu Asanuma
> Assignee: Takanobu Asanuma
> Priority: Major
> Attachments: HDFS-13661.1.patch
>
>
> {noformat}
> $ hadoop fs -ls -e file://
> Found 10 items
> -ls: Fatal internal error
> java.lang.NullPointerException
> at org.apache.hadoop.fs.shell.Ls.adjustColumnWidths(Ls.java:308)
> at org.apache.hadoop.fs.shell.Ls.processPaths(Ls.java:242)
> at org.apache.hadoop.fs.shell.Command.recursePath(Command.java:387)
> at org.apache.hadoop.fs.shell.Ls.processPathArgument(Ls.java:226)
> at org.apache.hadoop.fs.shell.Command.processArgument(Command.java:285)
> at org.apache.hadoop.fs.shell.Command.processArguments(Command.java:269)
> at
> org.apache.hadoop.fs.shell.FsCommand.processRawArguments(FsCommand.java:120)
> at org.apache.hadoop.fs.shell.Command.run(Command.java:176)
> at org.apache.hadoop.fs.FsShell.run(FsShell.java:328)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:90)
> at org.apache.hadoop.fs.FsShell.main(FsShell.java:391)
> {noformat}
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