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From "Haohui Mai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9201) Namenode Performance Improvement : Using for loop without iterator
Date Fri, 09 Oct 2015 21:05:07 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14951190#comment-14951190

Haohui Mai commented on HDFS-9201:

My understanding is that they are simply syntactic sugars. Can you please post the bytecode
and the jitted assembly?

Having 5% in microbenchmarks looks nice, but how does it impact real-world use case? Is it
a premature optimization?

> Namenode Performance Improvement : Using for loop without iterator
> ------------------------------------------------------------------
>                 Key: HDFS-9201
>                 URL: https://issues.apache.org/jira/browse/HDFS-9201
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: nijel
>            Assignee: nijel
>              Labels: namenode, performance
>         Attachments: HDFS-9201_draft.patch
> As discussed in HBASE-12023, the for each loop syntax will create few extra objects and
> For arrays and Lists can change to the traditional syntax. 
> This can improve memory foot print and can result in performance gain.

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