HDFS-16831. Add doc for shuffleObserverNN.

apache · Nov 9, 2022 · 4451a84 · 4451a84
1 parent ebadfb1
commit 4451a84
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/...in/java/org/apache/hadoop/hdfs/server/federation/resolver/MembershipNamenodeResolver.java b/...in/java/org/apache/hadoop/hdfs/server/federation/resolver/MembershipNamenodeResolver.java
@@ -189,6 +189,13 @@ private void updateNameNodeState(final String nsId,
     }
   }
 
+  /**
+   * Try to shuffle the multiple observer namenodes if listObserversFirst is true.
+   * @param inputNameNodes the input namenodes which has been sorted by NamenodePriorityComparator
+   * @param listObserversFirst true if we need to shuffule the multiple observer namenodes.
+   * @return a list of FederationNamenodeContext.
+   * @param <T> a subclass of FederationNamenodeContext.
+   */
   private <T extends FederationNamenodeContext> List<T> shuffleObserverNN(
       List<T> inputNameNodes, boolean listObserversFirst) {
     if (!listObserversFirst) {