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https://issues.apache.org/jira/browse/HADOOP-5124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12669806#action_12669806
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Konstantin Shvachko commented on HADOOP-5124:
---------------------------------------------
Sorry about (2). I thought {if(!it.hasNext())}} is the old code. It is the new
one, so it is absolutely correct. Please disregard (2).
> A few optimizations to FsNamesystem#RecentInvalidateSets
> --------------------------------------------------------
>
> Key: HADOOP-5124
> URL: https://issues.apache.org/jira/browse/HADOOP-5124
> Project: Hadoop Core
> Issue Type: Improvement
> Components: dfs
> Reporter: Hairong Kuang
> Assignee: Hairong Kuang
> Fix For: 0.21.0
>
> Attachments: optimizeInvalidate.patch, optimizeInvalidate1.patch
>
>
> This jira proposes a few optimization to FsNamesystem#RecentInvalidateSets:
> 1. when removing all replicas of a block, it does not traverse all nodes in
> the map. Instead it traverse only the nodes that the block is located.
> 2. When dispatching blocks to datanodes in ReplicationMonitor. It randomly
> chooses a predefined number of datanodes and dispatches blocks to those
> datanodes. This strategy provides fairness to all datanodes. The current
> strategy always starts from the first datanode.
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