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From "Lance Riedel (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-622) Users should be able to change the environment in which there maps/reduces run.
Date Tue, 22 May 2007 16:50:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12497926

Lance Riedel commented on HADOOP-622:

For some native apps, the native library loads other dependencies that need a system LD_LIBRARY_PATH
be set, not just the following:

  // Add java.library.path; necessary for native-hadoop libraries
      String libraryPath = System.getProperty("java.library.path");
      if (libraryPath != null) {
          vargs.add("-Djava.library.path=" + libraryPath);

Currently the TaskRunner gets run by inheriting the parents java processes environment, so
there is no chance to change this:

private void runChild(String[] args, File dir) throws IOException {
    this.process = Runtime.getRuntime().exec(args, null, dir);

NOTE: the null paramater indicates that the parent env be inherited.

Also, some of the native libraries that are untarred in the cache may be buried in a sub dir
(e.g.  /path/to untarred cache/myapp/lib/native.so). This full path isn't known until right
before the TaskRunner starts, so either there needs to be a call back, or a relative path
to the native library needs to be appended to the cache dir, and sent to the Runtime.getRuntime().exec

> Users should be able to change the environment in which there maps/reduces run.
> -------------------------------------------------------------------------------
>                 Key: HADOOP-622
>                 URL: https://issues.apache.org/jira/browse/HADOOP-622
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Mahadev konar
>         Assigned To: Owen O'Malley
>            Priority: Minor
>             Fix For: 0.14.0
> This would be useful with caching. So you would be avble to say, cache file X and then
should be able to change the environment variable like PATH/LD_LIBRARY_PATH to include the
local path hwere the file was cached. 

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