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https://issues.apache.org/jira/browse/PIG-794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12905765#action_12905765
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Jeff Zhang commented on PIG-794:
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Dmitriy,
The InternalMap's key and value must be pig writable types, so we can serialize
it.
Scott,
The InternalMap is used in the sample job when there's an "order by" statement.
You can refer UDF FindQuantiles which is used in sampling job. And in the
second job, we will read it in Partitioner (You can refer
WeightedRangePartitioner)
The InternalMap is used as the intermediate data between jobs.
> Use Avro serialization in Pig
> -----------------------------
>
> Key: PIG-794
> URL: https://issues.apache.org/jira/browse/PIG-794
> Project: Pig
> Issue Type: Improvement
> Components: impl
> Affects Versions: 0.2.0
> Reporter: Rakesh Setty
> Assignee: Dmitriy V. Ryaboy
> Attachments: avro-0.1-dev-java_r765402.jar, AvroStorage.patch,
> AvroStorage_2.patch, AvroStorage_3.patch, AvroStorage_4.patch, AvroTest.java,
> jackson-asl-0.9.4.jar, PIG-794.patch
>
>
> We would like to use Avro serialization in Pig to pass data between MR jobs
> instead of the current BinStorage. Attached is an implementation of
> AvroBinStorage which performs significantly better compared to BinStorage on
> our benchmarks.
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