HDFS-11866. JournalNode Sync should be off by default in hdfs-default.xml. Contributed by Hanisha Koneru.

hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml

@@ -3839,7 +3839,7 @@
 
 <property>
   <name>dfs.journalnode.enable.sync</name>
-  <value>true</value>
+  <value>false</value>
   <description>
     If true, the journal nodes wil sync with each other. The journal nodes
     will periodically gossip with other journal nodes to compare edit log