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From "Craig Macdonald (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-2857) libhdfs: no way to set JVM args other than classpath
Date Wed, 20 Feb 2008 15:51:57 GMT
libhdfs: no way to set JVM args other than classpath
----------------------------------------------------

                 Key: HADOOP-2857
                 URL: https://issues.apache.org/jira/browse/HADOOP-2857
             Project: Hadoop Core
          Issue Type: Improvement
          Components: libhdfs
    Affects Versions: 0.16.0
            Reporter: Craig Macdonald
            Priority: Minor


I would like a way to set other Java system properties and/or other Java VM arguments when
using libhdfs - i.e. I want to be able to say start a profiler, attach a debugger, or increase
the memory available to the VM.

At present, new JVMs are initialised from the getJNIEnv(void) method in src/c++/libhdfs/hdfsJniHelper.c
This method initialises the -Djava.class.path JVM argument from the CLASSPATH environment
variable. I am proposing that another env variable should be added, the contents of which
is passed (almost) verbatim as JVM arguments.

Eg, say the env var JVM_ARGS is used. The string from the env var would be tokenised on "one
or more spaces", and would be passed as additional JVM arguments, by make a larger JavaVMOption
options[] array, and setting vm_args.nOptions = 1+ number of passed arguments.

Only flaw I can see with this is that none of the passed parameters can contain spaces.

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