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https://issues.apache.org/jira/browse/HIVE-4732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13766816#comment-13766816
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Mark Wagner commented on HIVE-4732:
-----------------------------------
The write and readFields methods are used when serializing the writable, but
not when persisting to disk. We'll still want to maintain that id if the record
is serialized and deserialized so we can do the equality comparison on the
other side. I don't believe that those methods are ever actually used in Hive
(the ORC equivalent of AvroGenericRecordWritable doesn't even implement it),
but for completeness they are included.
> Reduce or eliminate the expensive Schema equals() check for AvroSerde
> ---------------------------------------------------------------------
>
> Key: HIVE-4732
> URL: https://issues.apache.org/jira/browse/HIVE-4732
> Project: Hive
> Issue Type: Improvement
> Components: Serializers/Deserializers
> Reporter: Mark Wagner
> Assignee: Mohammad Kamrul Islam
> Attachments: HIVE-4732.1.patch, HIVE-4732.v1.patch
>
>
> The AvroSerde spends a significant amount of time checking schema equality.
> Changing to compare hashcodes (which can be computed once then reused) will
> improve performance.
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