[jira] [Created] (FLINK-6763) Inefficient PojoSerializerConfigSnapshot serialization format

["Till Rohrmann (JIRA)" <ji...@apache.org>]

Till Rohrmann created FLINK-6763:
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             Summary: Inefficient PojoSerializerConfigSnapshot serialization format
                 Key: FLINK-6763
                 URL: https://issues.apache.org/jira/browse/FLINK-6763
             Project: Flink
          Issue Type: Improvement
          Components: State Backends, Checkpointing, Type Serialization System
    Affects Versions: 1.3.0, 1.4.0
            Reporter: Till Rohrmann


The {{PojoSerializerConfigSnapshot}} stores for each serializer the beginning offset and ending offset in the serialization stream. This information is also written if the serializer serialization is supposed to be ignored. The beginning and ending offsets are stored as a sequence of integers at the beginning of the serialization stream. We store this information to skip broken serializers.

I think we don't need both offsets. Instead I would suggest to write the length of the serialized serializer first into the serialization stream and then the serialized serializer. This can be done in {{TypeSerializerSerializationUtil.writeSerializer}}. When reading the serializer via {{TypeSerializerSerializationUtil.tryReadSerializer}}, we can try to deserialize the serializer. If this operation fails, then we can skip the number of serialized serializer because we know how long it was.



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