JiangHua Zhu created HDFS-15901:
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Summary: Solve the problem of DN repeated block reports occupying
too many RPCs during Safemode
Key: HDFS-15901
URL: https://issues.apache.org/jira/browse/HDFS-15901
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: JiangHua Zhu
When the cluster exceeds thousands of nodes, we want to restart the NameNode
service, and all DataNodes send a full Block action to the NameNode. During
SafeMode, some DataNodes may send blocks to NameNode multiple times, which will
take up too much RPC. In fact, this is unnecessary.
In this case, some block report leases will fail or time out, and in extreme
cases, the NameNode will always stay in Safe Mode.
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