[jira] [Created] (YARN-11386) Fix issue with classpath resolution

["Gautham Banasandra (Jira)" <ji...@apache.org>]

Gautham Banasandra created YARN-11386:
-----------------------------------------

             Summary: Fix issue with classpath resolution
                 Key: YARN-11386
                 URL: https://issues.apache.org/jira/browse/YARN-11386
             Project: Hadoop YARN
          Issue Type: Bug
          Components: nodemanager
    Affects Versions: 3.4.0
         Environment: Windows 10
            Reporter: Gautham Banasandra
            Assignee: Gautham Banasandra


While launching the AM, the client puts the classpath into environment HashMap of the ContainerLaunchContext. To support cross-platform compatibility, some special notations must be used by the client. For example, <CPS> must be used as the classpath separator instead of ";" (Windows) or ":" (Linux). The NM would resolve all the <CPS> using the appropriate path separator according to the OS platform, prior to launching the container. In addition to this, the NM is also expected to expand and resolve all of the wildcard (*) occurrences in the classpath before launching the container, since the JVM doesn't understand the wildcard charater.

The issue we see here is, neither <CPS> resolution nor wildcard expansion is happening.

I tested this from Spark. To run a Spark application on YARN, one needs to set the *spark.yarn.jars* config to point to the location where Spark jars are present. NM would then add these jars to the classpath before launching the Spark AM container. The resolution didn't happen -

{code}
Manifest-Version:
1.0
Class-Path:
file:/D:/tmp/hadoop-Gautham/nm-local-dir/usercache/Gautham/appcache/application_1670138957874_0001/container_1670138957874_0001_01_000001/%7B%7BPWD%7D%7D%3CCPS%3E%7B%7BPWD%7D%7D/__spark_conf__%3CCPS%3E%7B%7BPWD%7D%7D/__spark_libs__/*%3CCPS%3E/D:/projects/github/apache/spark/jars/*%3CCPS%3E%7B%7BPWD%7D%7D/__spark_conf__/__hadoop_conf__
file:/D:/tmp/hadoop-Gautham/nm-local-dir/usercache/Gautham/appcache/application_1670138957874_0001/container_1670138957874_0001_01_000001/__spark_conf__/
file:/D:/tmp/hadoop-Gautham/nm-local-dir/usercache/Gautham/appcache/application_1670138957874_0001/container_1670138957874_0001_01_000001/__app__.jar
{code}

Note that %3CCPS%3E in the above code block should've been replaced by ";" or ":". Since this didn't happen, NM failed to launch the Spark AM container -

{code}
Could not find or load main class org.apache.spark.deploy.yarn.ApplicationMaster
{code}



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