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https://issues.apache.org/jira/browse/HADOOP-5124?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jitendra Nath Pandey updated HADOOP-5124:
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Attachment: HADOOP-5124-branch-0.20-security.patch
Patch for branch-0.20-security.
> A few optimizations to FsNamesystem#RecentInvalidateSets
> --------------------------------------------------------
>
> Key: HADOOP-5124
> URL: https://issues.apache.org/jira/browse/HADOOP-5124
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Hairong Kuang
> Assignee: Hairong Kuang
> Fix For: 0.20.205.1, 0.21.0
>
> Attachments: HADOOP-5124-branch-0.20-security.patch,
> optimizeInvalidate.patch, optimizeInvalidate1.patch,
> optimizeInvalidate2-0.20.2.patch, optimizeInvalidate2.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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