Gautham Banasandra created YARN-11386:
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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Note that %3CCPS%3E in the above code block should've been replaced by ";" or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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