linyiqun commented on a change in pull request #1430:
URL: https://github.com/apache/hadoop-ozone/pull/1430#discussion_r490064398
##########
File path:
hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/OzoneManagerStarter.java
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@@ -98,6 +98,28 @@ public void initOm()
}
}
+
+ /**
+ * This function implements a sub-command to allow the OM to be
+ * "prepared for upgrade".
+ */
+ @CommandLine.Command(name = "--prepareForUpgrade",
+ aliases = {"--prepareForDowngrade", "--flushTransactions"},
Review comment:
Will prepareForUpgrade command send multiple OMs simultaneously here? Or
we should trigger prepareForUpgrade command for each OM service.
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