goiri commented on code in PR #6013:
URL: https://github.com/apache/hadoop/pull/6013#discussion_r1313365757
##########
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestObserverNode.java:
##########
@@ -215,6 +216,39 @@ public void testSimpleRead() throws Exception {
assertSentTo(0);
}
+ @Test
+ public void testConfigStartup() throws Exception {
+ int numNameNodes = dfsCluster.getNumNameNodes();
+
+ // Transition all current observers to standby
+ for (int i = 0; i < numNameNodes; i++) {
+ if (dfsCluster.getNameNode(i).isObserverState()) {
+ dfsCluster.transitionToStandby(i);
+ }
+ }
+
+ // Add a new namenode with the observer startup option
+ conf.setBoolean(DFS_NAMENODE_OBSERVER_ENABLED_KEY, true);
Review Comment:
Can we add a test with this to false?
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