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https://issues.apache.org/jira/browse/HDFS-15981?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HDFS-15981 stopped by zhanghuazong.
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> Removing redundant block queues will slow down block reporting
> --------------------------------------------------------------
>
> Key: HDFS-15981
> URL: https://issues.apache.org/jira/browse/HDFS-15981
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Reporter: zhanghuazong
> Assignee: zhanghuazong
> Priority: Major
>
> When the block report satisfies the block distribution strategy, the block is
> removed from the lowredundancyBlocks. But removing the block from the
> lowredundancyBlocks is a redundant operation.
> First, in the patch queue, the block removal operation will be performed in
> the method chooseSourceDatanodes and validateReconstructionWork.
> second, the removal of the block report will only be at the
> QUEUE_REPLICAS_BADLY_DISTRIBUTED level, which is not an accurate operation.
> Finally, when there is a large amount of data in the
> QUEUE_REPLICAS_BADLY_DISTRIBUTED queue, the processing efficiency of the
> block report will be reduced
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