maobaolong created HDFS-13804:
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Summary: 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
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