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https://issues.apache.org/jira/browse/HDFS-11313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15966230#comment-15966230
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Zhe Zhang commented on HDFS-11313:
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Thanks [~redvine] for posting the design doc!
Linking to HDFS-9011 where [~jingzhao] has posted a related design and patch.
> Segmented Block Reports
> -----------------------
>
> Key: HDFS-11313
> URL: https://issues.apache.org/jira/browse/HDFS-11313
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode, namenode
> Affects Versions: 2.6.2
> Reporter: Konstantin Shvachko
> Assignee: Vinitha Reddy Gankidi
> Attachments: SegmentedBlockReports.pdf
>
>
> Block reports from a single DataNode can be currently split into multiple
> RPCs each reporting a single DataNode storage (disk). The reports are still
> large since disks are getting bigger. Splitting blockReport RPCs into
> multiple smaller calls would improve NameNode performance and overall HDFS
> stability.
> This was discussed in multiple jiras. Here the approach is to let NameNode
> divide blockID space into segments and then ask DataNodes to report replicas
> in a particular range of IDs.
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