libhdfs: no way to set JVM args other than classpath
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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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