[jira] [Updated] (AVRO-853) Cache hash codes in Schema and Field

["Doug Cutting (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AVRO-853?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Doug Cutting updated AVRO-853:
------------------------------

      Resolution: Fixed
        Assignee: Doug Cutting
    Hadoop Flags: [Reviewed]
          Status: Resolved  (was: Patch Available)

I committed this.

> Cache hash codes in Schema and Field
> ------------------------------------
>
>                 Key: AVRO-853
>                 URL: https://issues.apache.org/jira/browse/AVRO-853
>             Project: Avro
>          Issue Type: Improvement
>          Components: java
>    Affects Versions: 1.5.1
>            Reporter: Douglas Kaminsky
>            Assignee: Doug Cutting
>             Fix For: 1.6.0
>
>         Attachments: AVRO-853-approach2.patch, AVRO-853.patch, AVRO-853.patch, AVRO-853.patch
>
>
> We are experiencing a serious performance degradation when trying to store/retrieve fields and schemas in hash-based data structures (eg. HashMap). Since all fields and schemas are immutable (with the exception of RecordSchema allowing deferred setting of Fields) it makes sense to cache the hash code on the object instead of recalculating every time the hashCode method gets called. 
> (Are there other mutable Schema sub-types that I'm not thinking about?)

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