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https://issues.apache.org/jira/browse/HADOOP-10820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14066588#comment-14066588
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zhihai xu commented on HADOOP-10820:
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+1
The new patch looks good for me.
> Empty entry in libjars results in working directory being recursively
> localized
> -------------------------------------------------------------------------------
>
> Key: HADOOP-10820
> URL: https://issues.apache.org/jira/browse/HADOOP-10820
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 2.2.0
> Reporter: Alex Holmes
> Priority: Minor
> Attachments: HADOOP-10820-1.patch, HADOOP-10820.patch
>
>
> An empty token (e.g. "a.jar,,b.jar") in the -libjars option causes the
> current working directory to be recursively localized.
> Here's an example of this in action (using Hadoop 2.2.0):
> {code}
> # create a temp directory and touch three JAR files
> mkdir -p tmp/path && cd tmp && touch a.jar b.jar c.jar path/d.jar
> # Run an example job only specifying two of the JARs.
> # Include an empty entry in libjars.
> hadoop jar
> /usr/local/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar
> pi -libjars a.jar,,c.jar 2 1000000000
> # As the job is running examine the localized directory in HDFS.
> # Notice that not only are the two JAR's specified in libjars copied,
> # but in addition the contents of the working directory are also recursively
> copied.
> $ hadoop fs -lsr
> /tmp/hadoop-yarn/staging/aholmes/.staging/job_1404752711144_0018/libjars
> /tmp/hadoop-yarn/staging/aholmes/.staging/job_1404752711144_0018/libjars/a.jar
> /tmp/hadoop-yarn/staging/aholmes/.staging/job_1404752711144_0018/libjars/c.jar
> /tmp/hadoop-yarn/staging/aholmes/.staging/job_1404752711144_0018/libjars/tmp
> /tmp/hadoop-yarn/staging/aholmes/.staging/job_1404752711144_0018/libjars/tmp/a.jar
> /tmp/hadoop-yarn/staging/aholmes/.staging/job_1404752711144_0018/libjars/tmp/b.jar
> /tmp/hadoop-yarn/staging/aholmes/.staging/job_1404752711144_0018/libjars/tmp/c.jar
> /tmp/hadoop-yarn/staging/aholmes/.staging/job_1404752711144_0018/libjars/tmp/path
> /tmp/hadoop-yarn/staging/aholmes/.staging/job_1404752711144_0018/libjars/tmp/path/d.jar
> {code}
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