[jira] [Commented] (HADOOP-10218) Using brace glob pattern in S3N URL causes exception due to Path created with empty string

["Steve Loughran (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-10218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16369347#comment-16369347 ] 

Steve Loughran commented on HADOOP-10218:
-----------------------------------------

Ignoring the fact that glob expansion doesn't take; s3a doesn't display this error (tested). And as s3n is no more, this problem doesn't exist in the form reported here

> Using brace glob pattern in S3N URL causes exception due to Path created with empty string
> ------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-10218
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10218
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs/s3
>    Affects Versions: 1.2.1
>            Reporter: Björn Ramberg
>            Priority: Major
>
> When using a brace glob pattern inside a S3 URL, an exception is thrown because a Path is constructed with the empty string. The simplest reproduction case I've found is:
> {code:none}
> $ hadoop fs -ls 's3n://public-read-access-bucket/{foo,bar}'
> ls: Can not create a Path from an empty string
> {code}
> It does not seem to make a difference whether any file exists that match the pattern. The problem only seems to affect buckets with public read access. The private buckets tried seem to work fine. When running through a Hadoop step, the following backtrace was produced:
> {code:none}
> Exception in thread "main" 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:50)
> 	at org.apache.hadoop.fs.s3native.NativeS3FileSystem.listStatus(NativeS3FileSystem.java:856)
> 	at org.apache.hadoop.fs.FileSystem.listStatus(FileSystem.java:844)
> 	at org.apache.hadoop.fs.FileSystem.listStatus(FileSystem.java:904)
> 	at org.apache.hadoop.fs.FileSystem.globPathsLevel(FileSystem.java:1082)
> 	at org.apache.hadoop.fs.FileSystem.globStatusInternal(FileSystem.java:1025)
> 	at org.apache.hadoop.fs.FileSystem.globStatus(FileSystem.java:989)
> 	at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.listStatus(FileInputFormat.java:215)
> 	at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.getSplits(FileInputFormat.java:252)
> 	at org.apache.hadoop.mapred.JobClient.writeNewSplits(JobClient.java:1017)
> 	at org.apache.hadoop.mapred.JobClient.writeSplits(JobClient.java:1034)
> 	at org.apache.hadoop.mapred.JobClient.access$700(JobClient.java:174)
> 	at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:952)
> 	at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:905)
> 	at java.security.AccessController.doPrivileged(Native Method)
> 	at javax.security.auth.Subject.doAs(Subject.java:415)
> 	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1132)
> 	at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:905)
> 	at org.apache.hadoop.mapreduce.Job.submit(Job.java:500)
> 	at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:530)
> 	at rubydoop.RubydoopJobRunner.run(RubydoopJobRunner.java:29)
> 	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
> 	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
> 	at rubydoop.RubydoopJobRunner.main(RubydoopJobRunner.java:74)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:606)
> 	at org.apache.hadoop.util.RunJar.main(RunJar.java:187)
> {code}
> Furthermore, interestingly, the following works:
> {code:none}
> $ hadoop fs -ls 's3n://public-read-access-bucket/{foo/,bar/}{baz,qux}'
> {code}
> but this fails:
> {code:none}
> $ hadoop fs -ls 's3n://public-read-access-bucket/{foo,bar}/{baz,qux}'
> {code}



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