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https://issues.apache.org/jira/browse/HDFS-9710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15124990#comment-15124990
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Tsz Wo Nicholas Sze commented on HDFS-9710:
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Created HDFS-9726 for code refactoring.
> Change DN to send block receipt IBRs in batches
> -----------------------------------------------
>
> Key: HDFS-9710
> URL: https://issues.apache.org/jira/browse/HDFS-9710
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Tsz Wo Nicholas Sze
>
> When a DN has received a block, it immediately sends a block receipt IBR RPC
> to NN for report the block. Even if a DN has received multiple blocks about
> the same time, it still sends multiple RPCs. It does not scale well since NN
> has to process a huge number of RPCs when many DNs receiving many blocks at
> the same time.
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