[jira] [Created] (LIVY-459) First submission via livy-python-api fails with KryoException, subsequent retries succeed

["Matthias Wolf (JIRA)" <ji...@apache.org>]

Matthias Wolf created LIVY-459:
----------------------------------

             Summary: First submission via livy-python-api fails with KryoException, subsequent retries succeed
                 Key: LIVY-459
                 URL: https://issues.apache.org/jira/browse/LIVY-459
             Project: Livy
          Issue Type: Bug
    Affects Versions: 0.5.0, 0.6.0
         Environment: Red Hat Enterprise Linux Server release 7.3 (Maipo)
java version "1.8.0_141"
            Reporter: Matthias Wolf


I have the following code:
{code}
from livy.client import HttpClient


def foobar(ctx):
    return ctx.sc.parallelize(range(101)).mean()


client = HttpClient('http://r2i0n33:8998')
try:
    print(client.submit(foobar).result())
except Exception as e:
    print(e)
print(client.submit(foobar).result())
client.stop(True)
{code}
failing with the following error:
{code:java}
org.apache.livy.shaded.kryo.kryo.KryoException: Encountered unregistered class ID: 510
org.apache.livy.shaded.kryo.kryo.util.DefaultClassResolver.readClass(DefaultClassResolver.java:119)
org.apache.livy.shaded.kryo.kryo.Kryo.readClass(Kryo.java:656)
org.apache.livy.shaded.kryo.kryo.Kryo.readClassAndObject(Kryo.java:767)
org.apache.livy.client.common.Serializer.deserialize(Serializer.java:63)
org.apache.livy.rsc.driver.BypassJob.call(BypassJob.java:39)
org.apache.livy.rsc.driver.BypassJob.call(BypassJob.java:27)
org.apache.livy.rsc.driver.JobWrapper.call(JobWrapper.java:57)
org.apache.livy.rsc.driver.BypassJobWrapper.call(BypassJobWrapper.java:42)
org.apache.livy.rsc.driver.BypassJobWrapper.call(BypassJobWrapper.java:27)
java.util.concurrent.FutureTask.run(FutureTask.java:266)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
java.lang.Thread.run(Thread.java:748)
50.0
{code}
Is this to be expected? I would have thought that the first submission should work already. I did not find this behavior online/in the mailing list archives. Any pointers how to resolve this?

This happens in both the livy-0.5.0 binaries and the github master, on RedHat EL 7.3.



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