[jira] [Updated] (MAPREDUCE-3693) Job's shouldn't have to configure the location of compression libraries on the server in mapred-site.xml

["Eli Collins (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3693?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eli Collins updated MAPREDUCE-3693:
-----------------------------------

    Summary: Job's shouldn't have to configure the location of compression libraries on the server in mapred-site.xml  (was: mapreduce's MapReduceChildJVM no longer proxies value of  java.library.path)
    
> Job's shouldn't have to configure the location of compression libraries on the server in mapred-site.xml
> --------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3693
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3693
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.0
>            Reporter: Roman Shaposhnik
>
> I have noticed that org.apache.hadoop.mapred.MapReduceChildJVM doesn't forward the value of -Djava.library.path= from the parent JVM to the child JVM. Thus if one wants to use native libraries for compression the only option seems to be to manually include relevant java.library.path settings into the mapred-site.xml (as mapred.[map|reduce].child.java.opts).
> This seems to be a change in behavior compared to MR1 where TaskRunner.java used to do that:
> {noformat}
> String libraryPath = System.getProperty("java.library.path");
>     if (libraryPath == null) {
>       libraryPath = workDir.getAbsolutePath();
>     } else {
>       libraryPath += SYSTEM_PATH_SEPARATOR + workDir;
>     }
>     boolean hasUserLDPath = false;
>     for(int i=0; i<javaOptsSplit.length ;i++) {
>       if(javaOptsSplit[i].startsWith("-Djava.library.path=")) {
>         javaOptsSplit[i] += SYSTEM_PATH_SEPARATOR + libraryPath;
>         hasUserLDPath = true;
>         break;
>       }
>     }
>     if(!hasUserLDPath) {
>       vargs.add("-Djava.library.path=" + libraryPath);
>     }
>     for (int i = 0; i < javaOptsSplit.length; i++) {
>       vargs.add(javaOptsSplit[i]);
>     }
> {noformat}
> Is this a regression or a deliberate choice?

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