Maybe you've already checked these out. Some basic questions that come to my
mind are:
1) is this library "foolib" or "foo-C-library" available on the worker node?
2) if yes, is it accessible by the user/program (rwx)?
Thanks,
Vasu.
> On Nov 26, 2016, at 5:08 PM, kant kodali <kanth...@gmail.com> wrote:
>
> If it is working for standalone program I would think you can apply the same
> settings across all the spark worker and client machines and give that a
> try. Lets start with that.
>
>> On Sat, Nov 26, 2016 at 11:59 AM, vineet chadha <start.vin...@gmail.com>
>> wrote:
>> Just subscribed to Spark User. So, forwarding message again.
>>
>>> On Sat, Nov 26, 2016 at 11:50 AM, vineet chadha <start.vin...@gmail.com>
>>> wrote:
>>> Thanks Kant. Can you give me a sample program which allows me to call jni
>>> from executor task ? I have jni working in standalone program in
>>> scala/java.
>>>
>>> Regards,
>>> Vineet
>>>
>>>> On Sat, Nov 26, 2016 at 11:43 AM, kant kodali <kanth...@gmail.com> wrote:
>>>> Yes this is a Java JNI question. Nothing to do with Spark really.
>>>>
>>>> java.lang.UnsatisfiedLinkError typically would mean the way you setup
>>>> LD_LIBRARY_PATH is wrong unless you tell us that it is working for other
>>>> cases but not this one.
>>>>
>>>>> On Sat, Nov 26, 2016 at 11:23 AM, Reynold Xin <r...@databricks.com> wrote:
>>>>
>>>>> That's just standard JNI and has nothing to do with Spark, does it?
>>>>>
>>>>>
>>>>>> On Sat, Nov 26, 2016 at 11:19 AM, vineet chadha <start.vin...@gmail.com>
>>>>>> wrote:
>>>>>> Thanks Reynold for quick reply.
>>>>>>
>>>>>> I have tried following:
>>>>>>
>>>>>> class MySimpleApp {
>>>>>> // ---Native methods
>>>>>> @native def fooMethod (foo: String): String
>>>>>> }
>>>>>>
>>>>>> object MySimpleApp {
>>>>>> val flag = false
>>>>>> def loadResources() {
>>>>>> System.loadLibrary("foo-C-library")
>>>>>> val flag = true
>>>>>> }
>>>>>> def main() {
>>>>>> sc.parallelize(1 to 10).mapPartitions ( iter => {
>>>>>> if(flag == false){
>>>>>> MySimpleApp.loadResources()
>>>>>> val SimpleInstance = new MySimpleApp
>>>>>> }
>>>>>> SimpleInstance.fooMethod ("fooString")
>>>>>> iter
>>>>>> })
>>>>>> }
>>>>>> }
>>>>>>
>>>>>> I don't see way to invoke fooMethod which is implemented in
>>>>>> foo-C-library. Is I am missing something ? If possible, can you point me
>>>>>> to existing implementation which i can refer to.
>>>>>>
>>>>>> Thanks again.
>>>>>> ~
>>>>>>
>>>>>>
>>>>>>> On Fri, Nov 25, 2016 at 3:32 PM, Reynold Xin <r...@databricks.com>
>>>>>>> wrote:
>>>>>>> bcc dev@ and add user@
>>>>>>>
>>>>>>>
>>>>>>> This is more a user@ list question rather than a dev@ list question.
>>>>>>> You can do something like this:
>>>>>>>
>>>>>>> object MySimpleApp {
>>>>>>> def loadResources(): Unit = // define some idempotent way to load
>>>>>>> resources, e.g. with a flag or lazy val
>>>>>>>
>>>>>>> def main() = {
>>>>>>> ...
>>>>>>>
>>>>>>> sc.parallelize(1 to 10).mapPartitions { iter =>
>>>>>>> MySimpleApp.loadResources()
>>>>>>>
>>>>>>> // do whatever you want with the iterator
>>>>>>> }
>>>>>>> }
>>>>>>> }
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>> On Fri, Nov 25, 2016 at 2:33 PM, vineet chadha
>>>>>>>> <start.vin...@gmail.com> wrote:
>>>>>>>> Hi,
>>>>>>>>
>>>>>>>> I am trying to invoke C library from the Spark Stack using JNI
>>>>>>>> interface (here is sample application code)
>>>>>>>>
>>>>>>>>
>>>>>>>> class SimpleApp {
>>>>>>>> // ---Native methods
>>>>>>>> @native def foo (Top: String): String
>>>>>>>> }
>>>>>>>>
>>>>>>>> object SimpleApp {
>>>>>>>> def main(args: Array[String]) {
>>>>>>>>
>>>>>>>> val conf = new
>>>>>>>> SparkConf().setAppName("SimpleApplication").set("SPARK_LIBRARY_PATH",
>>>>>>>> "lib")
>>>>>>>> val sc = new SparkContext(conf)
>>>>>>>> System.loadLibrary("foolib")
>>>>>>>> //instantiate the class
>>>>>>>> val SimpleAppInstance = new SimpleApp
>>>>>>>> //String passing - Working
>>>>>>>> val ret = SimpleAppInstance.foo("fooString")
>>>>>>>> }
>>>>>>>>
>>>>>>>> Above code work fines.
>>>>>>>>
>>>>>>>> I have setup LD_LIBRARY_PATH and spark.executor.extraClassPath,
>>>>>>>> spark.executor.extraLibraryPath at worker node
>>>>>>>>
>>>>>>>> How can i invoke JNI library from worker node ? Where should i load it
>>>>>>>> in executor ?
>>>>>>>> Calling System.loadLibrary("foolib") inside the work node gives me
>>>>>>>> following error :
>>>>>>>>
>>>>>>>> Exception in thread "main" java.lang.UnsatisfiedLinkError:
>>>>>>>> Any help would be really appreciated.
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>
