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https://issues.apache.org/jira/browse/PIG-3046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13496358#comment-13496358
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Michael Czerwiński commented on PIG-3046:
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Also this issue occurs whenever you specify in the -Dpig.additional.jars a
directory path instead of the file path. This is quite often happening because
its advised on forums to include HIVE_HOME and HADOOP_HOME in the PIG_CLASSPATH
which is then passed to -Dpig.additional.jars.
> An empty file name in -Dpig.additional.jars throws an error
> -----------------------------------------------------------
>
> Key: PIG-3046
> URL: https://issues.apache.org/jira/browse/PIG-3046
> Project: Pig
> Issue Type: Bug
> Reporter: Cheolsoo Park
> Labels: newbie
>
> This issue was raised on the user mailing list. To reproduce it, please run
> the following command in MR mode:
> {code}
> pig -Dpig.additional.jars=<jar1>::<jar2> <pig script>
> {code}
> As can be seen, I put {{::}} in the middle of {{-Dpig.additional.jars}}, and
> this causes the following error:
> {code}
> Caused by: java.lang.IllegalArgumentException: Can not create a Path from
> an empty string at org.apache.hadoop.fs.Path.checkPathArg(Path.java:82)
> at org.apache.hadoop.fs.Path.<init>(Path.java:90)
> at org.apache.hadoop.fs.Path.<init>(Path.java:45)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler.shipToHDFS(JobControlCompiler.java:1455)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler.putJarOnClassPathThroughDistributedCache(JobControlCompiler.java:1432)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler.getJob(JobControlCompiler.java:508)
> {code}
> Although it's not too hard to see what's wrong, it's not always easy to track
> down where an empty file name is from. In particular if various environment
> variables are set in another start-up script, it's time-consuming to identify
> the root cause.
> In fact, Pig should just skip an empty file name instead attempts to convert
> it to a path and throws an exception like this.
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