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https://issues.apache.org/jira/browse/HDFS-13804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16573078#comment-16573078
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Wei-Chiu Chuang commented on HDFS-13804:
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Sorry but I'm confused. maxDataLength was added in HDFS-10312 to overcome
certain cases where block report can be longer than default protobuf message
length. It is certainly used beyond web ui.
> DN maxDataLength is useless except DN webui. I suggest to get maxDataLength
> from NN heartbeat.
> ----------------------------------------------------------------------------------------------
>
> Key: HDFS-13804
> URL: https://issues.apache.org/jira/browse/HDFS-13804
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: datanode
> Reporter: maobaolong
> Priority: Major
> Labels: DataNode
>
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