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Fengdong Yu commented on HDFS-5778: ----------------------------------- hi [~szetszwo], please delete above comments, which is invalid format. I read the document again, {code} hdfs dfsadmin -rollingUpgrade start {code} What steps this command indicates? Does that shutdown *cluster* firstly, then start HDFS with -upgrade options? or start to upgrade NNs and DNs one by one? from the code patch, it only calls {code} namesystem.startRollingUpgrade(); {code} > Document new commands and parameters for improved rolling upgrades > ------------------------------------------------------------------ > > Key: HDFS-5778 > URL: https://issues.apache.org/jira/browse/HDFS-5778 > Project: Hadoop HDFS > Issue Type: Sub-task > Components: documentation > Affects Versions: HDFS-5535 (Rolling upgrades) > Reporter: Akira AJISAKA > Assignee: Tsz Wo (Nicholas), SZE > Attachments: h5778_20140220.patch, h5778_20140221.patch > > > "hdfs dfsadmin -rollingUpgrade" command was newly added in HDFS-5752, and > some other commands and parameters will be added in the future. This issue > exists to flag undocumented commands and parameters when HDFS-5535 branch is > merging to trunk. -- This message was sent by Atlassian JIRA (v6.1.5#6160)