HDFS-14942. Change Log Level to debug in JournalNodeSyncer#syncWithJournalAtIndex. Contributed by Lisheng Sun.

(cherry picked from commit 9e287054a8)
(cherry picked from commit d16441460215155b25fa649a7ca733e579d97929)

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/qjournal/server/JournalNodeSyncer.java

@@ -251,7 +251,7 @@ public class JournalNodeSyncer {
       editLogManifest = jnProxy.getEditLogManifestFromJournal(jid,
           nameServiceId, 0, false);
     } catch (IOException e) {
-      LOG.error("Could not sync with Journal at " +
+      LOG.debug("Could not sync with Journal at {}.",
           otherJNProxies.get(journalNodeIndexForSync), e);
       return;
     }