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https://issues.apache.org/jira/browse/HDFS-5464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13814517#comment-13814517
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Konstantin Shvachko commented on HDFS-5464:
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So in regular case you will be adding 100,000 replicas to {{toRemove}} list
only in order to delete most of them later. How does it make things simpler?
The delimiter lets you keep the calculated lists as small as possible, reducing
memory consumption, avoiding frequent GCs.
> Simplify block report diff calculation
> --------------------------------------
>
> Key: HDFS-5464
> URL: https://issues.apache.org/jira/browse/HDFS-5464
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Priority: Minor
> Attachments: h5464_20131105.patch
>
>
> The current calculation in BlockManager.reportDiff(..) is unnecessarily
> complicated. We could simplify the calculation.
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