granewang commented on code in PR #6957:
URL: https://github.com/apache/hadoop/pull/6957#discussion_r1708899262
##########
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/main/java/org/apache/hadoop/yarn/client/cli/RMAdminCLI.java:
##########
@@ -757,6 +768,28 @@ private int replaceLabelsOnNodes(Map<NodeId, Set<String>>
map,
return 0;
}
+ private int failover(CommandLine cmd)
+ throws IOException, ServiceFailedException {
+ int numOpts = cmd.getOptions() == null ? 0 : cmd.getOptions().length;
+ final String[] args = cmd.getArgs();
+ if (numOpts > 1 || args.length != 2) {
+ errOut.println("failover: incorrect arguments");
+ printUsage(errOut, "-failover", YARN_HA_USAGE);
+ return -1;
+ }
+ HAServiceTarget fromNode = resolveTarget(args[0]);
+ HAServiceTarget toNode = resolveTarget(args[1]);
+ setRequestSource(HAServiceProtocol.RequestSource.REQUEST_BY_USER_FORCED);
+ HAServiceProtocol proto = fromNode.getProxy(
+ getConf(), 0);
+ HAServiceProtocolHelper.transitionToStandby(proto, createReqInfo());
+ HAServiceProtocol proto1 = toNode.getProxy(
+ getConf(), 0);
+ HAServiceProtocolHelper.transitionToActive(proto1, createReqInfo());
Review Comment:
If args[1] is the primary,it will return ：
HAServiceProtocolHelper.transitionToActive
->AdminService.java(transitionToActive):
"
@Override
public synchronized void transitionToActive(
HAServiceProtocol.StateChangeRequestInfo reqInfo) throws IOException {
if (isRMActive()) {
**return;**
}
....
"
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