Tsz Wo (Nicholas), SZE created HDFS-5848: --------------------------------------------
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. -- This message was sent by Atlassian JIRA (v6.1.5#6160)