[MAHOUT-780] job jars fail on OS X due to case-insensitive name conflict on 'license'

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.5
• Fix Version/s: 0.6
• Component/s: build-classic

Environment

Mac OS X

• Assignee: Sean R. Owen
• Reporter: Sean R. Owen
• Created: 01/Aug/11 11:05
• Updated: 09/Feb/12 14:01
• Resolved: 03/Aug/11 13:14

Description

Dan explains it well below. The workaround is to make the 'license' folder into a 'licenses' folder, but, where does this come from? anyone know?

With SVN 'At revision 1152597.', and freshly rebuilt:

jar -tvf /Users/danbri/Documents/workspace/trunk/examples/target/mahout-examples-0.6-SNAPSHOT-job.jar

grep -i license

19355 Sat Feb 26 19:16:30 CET 2011 META-INF/LICENSE.txt
11358 Sun Apr 11 21:45:12 CEST 2010 META-INF/LICENSE
1596 Mon Dec 20 15:47:30 CET 2010 LICENSE
0 Sun Dec 01 11:57:24 CET 2002 license/
4083 Sun Dec 01 11:57:24 CET 2002 license/LICENSE.dom-documentation.txt
3595 Sun Dec 01 11:57:24 CET 2002 license/LICENSE.dom-software.txt
804 Sun Dec 01 11:57:24 CET 2002 license/LICENSE.sax.txt
2827 Sun Dec 01 11:57:24 CET 2002 license/LICENSE.txt
1274 Sun Dec 01 11:57:24 CET 2002 license/README.dom.txt
715 Sun Dec 01 11:57:24 CET 2002 license/README.sax.txt
672 Sun Dec 01 11:57:24 CET 2002 license/README.txt

This situation seems to quite confuse Hadoop. The underlying OSX
filesystem doesn't support file and directory names differing only by
case; see http://developer.apple.com/library/mac/#documentation/Java/Conceptual/Java14Development/01-JavaOverview/JavaOverview.html

mahout lucene.vector --dir solr/data/index/ --output bar/vecs --field
label --idField id --dictOut bar/dict.out --norm 2

Running on hadoop, using HADOOP_HOME=/Users/danbri/working/hadoop/hadoop-0.20.2
HADOOP_CONF_DIR=/Users/danbri/working/hadoop/hadoop-0.20.2/conf
MAHOUT-JOB: /Users/danbri/Documents/workspace/trunk/examples/target/mahout-examples-0.6-SNAPSHOT-job.jar

Exception in thread "main" java.io.IOException: Mkdirs failed to
create /tmp/hadoop/hadoop-unjar5018665014541152120/license
at org.apache.hadoop.util.RunJar.unJar(RunJar.java:48)
at org.apache.hadoop.util.RunJar.main(RunJar.java:136)

That Hadoop error message is somewhat unhelpful, especially for those
who doubt their hadoop knowhow; but technically correct. The
/tmp/hadoop and its subdirectory exist and are writeable. The problem
is the specific file/dir names being written into it. That wasn't so
obvious. So I went chasing around configuring hadoop tmp dirs,
checking it existed and was writable in local and in hdfs dirs, ...
then ... I finally, belatedly tried unzipping the jar with 'jar -xvf '
to see what was special about 'license', and got the same error from
commandline 'jar' that upset !file.getParentFile().isDirectory() in
Hadoop's ./src/core/org/apache/hadoop/util/RunJar.java:

java.io.IOException: license : could not create directory
at sun.tools.jar.Main.extractFile(Main.java:909)
at sun.tools.jar.Main.extract(Main.java:852)
at sun.tools.jar.Main.run(Main.java:242)
at sun.tools.jar.Main.main(Main.java:1149)

(this is the same error that trips up hadoop)

This seems to be reproducible; I did an svn up, mvn clean and mvn
package, let all the tests run and pass, and confirm that the same
thing happens.

I compared an early job .jar from 0.5, where all was fine. Any
suggestions for best quick fix?