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Posted to dev@hive.apache.org by "Edward Capriolo (JIRA)" <ji...@apache.org> on 2013/08/04 19:45:48 UTC

[jira] [Commented] (HIVE-4732) Reduce or eliminate the expensive Schema equals() check for AvroSerde

    [ https://issues.apache.org/jira/browse/HIVE-4732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13728931#comment-13728931 ] 

Edward Capriolo commented on HIVE-4732:
---------------------------------------

See:
http://en.wikipedia.org/wiki/Universally_unique_identifier#Random_UUID_probability_of_duplicates
                
> 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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