[jira] [Commented] (MAPREDUCE-7172) Wildcard functionality of -libjar is broken when jars are located in same remote FS

["Wangda Tan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-7172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16718010#comment-16718010 ] 

Wangda Tan commented on MAPREDUCE-7172:
---------------------------------------

[~templedf], [~sjlee0], if you got chance, could u take a look at the issue? 

> Wildcard functionality of -libjar is broken when jars are located in same remote FS
> -----------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-7172
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7172
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Wangda Tan
>            Priority: Critical
>
> We recently found that when -libjar specified jars on the same remote FS, jars will not be properly added to classpath. 
> The reason is MAPREDUCE-6719 added the wildcard functionality, but the follow logic assumes files are all placed under job's submission directory. (Inside JobResourceUploader)
> {code:java}
> if (useWildcard && !foundFragment) {
>   // Add the whole directory to the cache using a wild card
>   Path libJarsDirWildcard =
>       jtFs.makeQualified(new Path(libjarsDir, DistributedCache.WILDCARD));
>   DistributedCache.addCacheFile(libJarsDirWildcard.toUri(), conf);
> }{code}
> However, in the same method, specified resources will be only uploaded when two FSes are different, see copyRemoteFiles:
> {code:java}
> if (FileUtil.compareFs(remoteFs, jtFs)) {
>   return originalPath;
> } {code}
> Workaround of this issue is pass:
> mapreduce.client.libjars.wildcard = false.
> When the MR job got launched. 
> Example commandline to reproduce this issue is: 
> {code:java}
> hadoop jar abc.jar org.ABC -libjars "wasb://host/path1/jar1,wasb://host/path2/jar2..."{code}
>  



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