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https://issues.apache.org/jira/browse/BEAM-2277?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16587423#comment-16587423
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Jozef Vilcek edited comment on BEAM-2277 at 8/21/18 1:31 PM:
-------------------------------------------------------------

So after more investigation, URI, which is backing the HadoopResourceId does 
also drop '//' on empty authority when calling HadoopResourceIr.resolve() and 
produce string versions of resource in "hdfs:/path" form. This is not accepted 
back as hdfs scheme by FileSystems.matchNewResource(). The question is, what 
would be an elegant fix to that.


was (Author: jozovilcek):
So after ore investigation, URI, which is backing the HadoopResourceId does 
also drope empty authority hen calling HadoopResourceIr.resolve() and produce 
string versions of resource in "hdfs:/path" form. This is not accepted back as 
hdfs scheme by FileSystems.matchNewResource(). The question is, what would be 
an elegant fix to that.

> IllegalArgumentException when using Hadoop file system for WordCount example.
> -----------------------------------------------------------------------------
>
>                 Key: BEAM-2277
>                 URL: https://issues.apache.org/jira/browse/BEAM-2277
>             Project: Beam
>          Issue Type: Bug
>          Components: z-do-not-use-sdk-java-extensions
>    Affects Versions: 2.6.0
>            Reporter: Aviem Zur
>            Assignee: Aviem Zur
>            Priority: Blocker
>             Fix For: 2.0.0
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> IllegalArgumentException when using Hadoop file system for WordCount example.
> Occurred when running WordCount example using Spark runner on a YARN cluster.
> Command-line arguments:
> {code:none}
> --runner=SparkRunner --inputFile=hdfs:///user/myuser/kinglear.txt 
> --output=hdfs:///user/myuser/wc/wc
> {code}
> Stack trace:
> {code:none}
> java.lang.IllegalArgumentException: Expect srcResourceIds and destResourceIds 
> have the same scheme, but received file, hdfs.
>       at 
> org.apache.beam.sdk.repackaged.com.google.common.base.Preconditions.checkArgument(Preconditions.java:122)
>       at 
> org.apache.beam.sdk.io.FileSystems.validateSrcDestLists(FileSystems.java:394)
>       at org.apache.beam.sdk.io.FileSystems.copy(FileSystems.java:236)
>       at 
> org.apache.beam.sdk.io.FileBasedSink$WriteOperation.copyToOutputFiles(FileBasedSink.java:626)
>       at 
> org.apache.beam.sdk.io.FileBasedSink$WriteOperation.finalize(FileBasedSink.java:516)
>       at 
> org.apache.beam.sdk.io.WriteFiles$2.processElement(WriteFiles.java:592)
> {code}



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