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From "Doug Cutting (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AVRO-911) remove object reuse from Java APIs
Date Thu, 06 Oct 2011 00:02:30 GMT

    [ https://issues.apache.org/jira/browse/AVRO-911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13121618#comment-13121618
] 

Doug Cutting commented on AVRO-911:
-----------------------------------

java version "1.6.0_22"
Java(TM) SE Runtime Environment (build 1.6.0_22-b04)
Java HotSpot(TM) Server VM (build 17.1-b03, mixed mode)

                
> remove object reuse from Java APIs
> ----------------------------------
>
>                 Key: AVRO-911
>                 URL: https://issues.apache.org/jira/browse/AVRO-911
>             Project: Avro
>          Issue Type: Improvement
>          Components: java
>            Reporter: Doug Cutting
>            Assignee: Doug Cutting
>             Fix For: 1.6.0
>
>         Attachments: perf-reuse.patch
>
>
> Avro's Java APIs were designed to permit object reuse when reading with the assumption
that would provide performance advantages.  In particular, the old parameter in DatumReader<T>.read(T
old, Decoder), the Utf8 class, and the GenericArray.peek() method were all designed for this
purpose.  But I am unable to see significant performance improvements when objects are reused.
 I tried modifying Perf.java's GenericTest to reuse records, and its StringTest to not reuse
Utf8 instances and, in both cases, performance is not substantially altered.
> If we were to remove these then issues such as AVRO-803 would disappear.  Always using
java.lang.String instead of Utf8 would remove a lot of user confusion. 

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