Tsz Wo (Nicholas), SZE created HDFS-5848:
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Summary: Add a DatanodeCommand to inform datanodes that rolling
upgrade is in progress
Key: HDFS-5848
URL: https://issues.apache.org/jira/browse/HDFS-5848
Project: Hadoop HDFS
Issue Type: Sub-task
Components: namenode
Reporter: Tsz Wo (Nicholas), SZE
Assignee: Tsz Wo (Nicholas), SZE
When rolling upgrade is in progress, NN should inform datanodes via heartbeat
responses so that datanode should create hardlinks when deleting blocks. We
need to add a new DatanodeCommand here. The datanode change will be done in a
separated JIRA.
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