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https://issues.apache.org/jira/browse/HDFS-9201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14951162#comment-14951162
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Andrew Wang commented on HDFS-9201:
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So in the mentioned HBASE jira, it looks like they added asserts to make sure
the lists supported random access. Nijel, could we do this here too? This would
address Staffan's comment.
I think the performance benchmarks also speak for themselves, even without GC
stats (though those would be nice too).
> 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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