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From Kohki Nishio <>
Subject JavaSerializerInstance is slow
Date Fri, 03 Sep 2021 03:56:33 GMT
I'm seeing many threads doing deserialization of a task, I understand since
lambda is involved, we can't use Kryo for those purposes. However I'm
running it in local mode, this serialization is not really necessary, no?

Is there any trick I can apply to get rid of this thread contention ? I'm
seeing many of the below threads in thread dumps ...

"Executor task launch worker for task 11.0 in stage 15472514.0 (TID
19788863)" #732821 daemon prio=5 os_prio=0 tid=0x00007f02581b2800
nid=0x355d waiting for monitor entry [0x00007effd1e3f000]
   java.lang.Thread.State: BLOCKED (on object monitor)
at java.lang.ClassLoader.loadClass(
- waiting to lock <0x00007f0f7246edf8> (a java.lang.Object)
at sun.misc.Launcher$AppClassLoader.loadClass(
at java.lang.ClassLoader.loadClass(


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