[jira] [Commented] (SPARK-9043) Serialize key, value and combiner classes in ShuffleDependency

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-9043?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14627051#comment-14627051 ] 

Apache Spark commented on SPARK-9043:
-------------------------------------

User 'massie' has created a pull request for this issue:
https://github.com/apache/spark/pull/7403

> Serialize key, value and combiner classes in ShuffleDependency
> --------------------------------------------------------------
>
>                 Key: SPARK-9043
>                 URL: https://issues.apache.org/jira/browse/SPARK-9043
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>            Reporter: Matt Massie
>
> ShuffleManager implementations are currently not given type information regarding the key, value and combiner classes. Serialization of shuffle objects relies on them being JavaSerializable, with methods defined for reading/writing the object or, alternatively, serialization via Kryo which uses reflection.
> Serialization systems like Avro, Thrift and Protobuf generate classes with zero argument constructors and explicit schema information (e.g. IndexedRecords in Avro have get, put and getSchema methods).
> By serializing the key, value and combiner class names in ShuffleDependency, shuffle implementations will have access to schema information when registerShuffle() is called.



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