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https://issues.apache.org/jira/browse/HDFS-9201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14951153#comment-14951153
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Staffan Friberg commented on HDFS-9201:
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For Lists you need to make sure you have an ArrayList, other lists might need
to iterate to access each entry.
> 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 garbage.
> 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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