HDFS-12376. Enable JournalNode Sync by default. Contributed by Hanisha Koneru.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java

@@ -924,7 +924,7 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
   public static final String  DFS_JOURNALNODE_KERBEROS_INTERNAL_SPNEGO_PRINCIPAL_KEY = "dfs.journalnode.kerberos.internal.spnego.principal";
   public static final String DFS_JOURNALNODE_ENABLE_SYNC_KEY =
       "dfs.journalnode.enable.sync";
-  public static final boolean DFS_JOURNALNODE_ENABLE_SYNC_DEFAULT = false;
+  public static final boolean DFS_JOURNALNODE_ENABLE_SYNC_DEFAULT = true;
   public static final String DFS_JOURNALNODE_SYNC_INTERVAL_KEY =
       "dfs.journalnode.sync.interval";
   public static final long DFS_JOURNALNODE_SYNC_INTERVAL_DEFAULT = 2*60*1000L;

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

@@ -3933,7 +3933,7 @@
 
 <property>
   <name>dfs.journalnode.enable.sync</name>
-  <value>false</value>
+  <value>true</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