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https://issues.apache.org/jira/browse/SPARK-25047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16573158#comment-16573158
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Sean Owen commented on SPARK-25047:
-----------------------------------
Thanks [~lrytz] – sounds like it is at least outside Spark's control. It only
came up in 2 cases in the whole code base, and appears to be easily worked
around by changing fields like {{val foo: A => B = {...}}} to simple function
definitions like {{def foo(a:A):B = {...}}}. If I hear no objections I'll
commit that change. It doesn't even appear to make the bytecode different in
this case (foo is a method in either case)
> Can't assign SerializedLambda to scala.Function1 in deserialization of
> BucketedRandomProjectionLSHModel
> -------------------------------------------------------------------------------------------------------
>
> Key: SPARK-25047
> URL: https://issues.apache.org/jira/browse/SPARK-25047
> Project: Spark
> Issue Type: Sub-task
> Components: ML
> Affects Versions: 2.4.0
> Reporter: Sean Owen
> Priority: Major
>
> Another distinct test failure:
> {code:java}
> - BucketedRandomProjectionLSH: streaming transform *** FAILED ***
> org.apache.spark.sql.streaming.StreamingQueryException: Query [id =
> 7f34fb07-a718-4488-b644-d27cfd29ff6c, runId =
> 0bbc0ba2-2952-4504-85d6-8aba877ba01b] terminated with exception: Job aborted
> due to stage failure: Task 0 in stage 16.0 failed 1 times, most recent
> failure: Lost task 0.0 in stage 16.0 (TID 16, localhost, executor driver):
> java.lang.ClassCastException: cannot assign instance of
> java.lang.invoke.SerializedLambda to field
> org.apache.spark.ml.feature.BucketedRandomProjectionLSHModel.hashFunction of
> type scala.Function1 in instance of
> org.apache.spark.ml.feature.BucketedRandomProjectionLSHModel
> ...
> Cause: java.lang.ClassCastException: cannot assign instance of
> java.lang.invoke.SerializedLambda to field
> org.apache.spark.ml.feature.BucketedRandomProjectionLSHModel.hashFunction of
> type scala.Function1 in instance of
> org.apache.spark.ml.feature.BucketedRandomProjectionLSHModel
> at
> java.io.ObjectStreamClass$FieldReflector.setObjFieldValues(ObjectStreamClass.java:2233)
> at java.io.ObjectStreamClass.setObjFieldValues(ObjectStreamClass.java:1405)
> at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2284)
> ...{code}
> Here the different nature of a Java 8 LMF closure trips of Java
> serialization/deserialization. I think this can be patched by manually
> implementing the Java serialization here, and don't see other instances (yet).
> Also wondering if this "val" can be a "def".
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