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https://issues.apache.org/jira/browse/HDFS-5470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13815452#comment-13815452
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Tsz Wo (Nicholas), SZE commented on HDFS-5470:
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The advantage for (non-static) inner class is to access the enclosing class
object by using "this" reference. Just like methods, we may make all methods
static and pass the enclosing object as a parameter. I beg you won't think
that it is a good design.
BTW, Java ArrayList.Itr is also non-static
http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/7-b147/java/util/ArrayList.java#ArrayList.Itr
> Add back trunk's reportDiff algorithm to HDFS-2832
> --------------------------------------------------
>
> Key: HDFS-5470
> URL: https://issues.apache.org/jira/browse/HDFS-5470
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: h5470_20131106.patch
>
>
> As reminded by [~shv] in HDFS-5464, the report diff algorithm uses less
> memory. It also has a faster running time. We should add it back to the
> branch.
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