[Improvement] Check Spark Serializer type

[jerqi]

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What would you like to be improved?

Spark have multiple serializers. We support the spark serializer which supportsRelocationOfSerializedObjects.
You can see https://github.com/apache/spark/blob/25849684b78cca6651e25d6efc9644a576e7e20f/core/src/main/scala/org/apache/spark/serializer/Serializer.scala#L98

Spark have three kinds of serializer
org.apache.spark.serializer.JavaSerializer
org.apache.spark.sql.execution.UnsafeRowSerializer
org.apache.spark.serializer.KryoSerializer
Only org.apache.spark.serializer.JavaSerializer don't support RelocationOfSerializedObjects.
So when we find the parameters to use org.apache.spark.serializer.JavaSerializer, We should throw an exception, similar code that you can refer to https://github.com/apache/incubator-uniffle/blob/d09b40b90b8db613dbd346e0cd91f70f3950b430/client-spark/spark2/src/main/java/org/apache/spark/shuffle/RssShuffleManager.java#L141

How should we improve?

check Serializer whether support supportsRelocationOfSerializedObjects, if not, throw an exception.

Are you willing to submit PR?

• Yes I am willing to submit a PR!

[maobaolong]

@jerqi Thanks to create this issue and we encountered this issue. Could you explain a bit more about why Uniffle cannot support a serializer which don't support RelocationOfSerializedObjects?