Addressing comments

hudi-utilities/src/main/java/org/apache/hudi/utilities/streamer/StreamSync.java

@@ -426,7 +426,7 @@ public Pair<Option<String>, JavaRDD<WriteStatus>> syncOnce() throws IOException
             || (newTargetSchema != null && !processedSchema.isSchemaPresent(newTargetSchema))) {
           String sourceStr = newSourceSchema == null ? NULL_PLACEHOLDER : newSourceSchema.toString(true);
           String targetStr = newTargetSchema == null ? NULL_PLACEHOLDER : newTargetSchema.toString(true);
-          LOG.info("Seeing new schema. Source: " + sourceStr + ", Target: " + targetStr);
+          LOG.info("Seeing new schema. Source: {0}, Target: {1}", sourceStr, targetStr);
           // We need to recreate write client with new schema and register them.
           reInitWriteClient(newSourceSchema, newTargetSchema, recordsFromSource);
           if (newSourceSchema != null) {
@@ -1009,13 +1009,13 @@ public void runMetaSync() {
           SyncUtilHelpers.runHoodieMetaSync(impl.trim(), metaProps, conf, fs, cfg.targetBasePath, cfg.baseFileFormat);
           success = true;
         } catch (HoodieMetaSyncException e) {
-          LOG.error("SyncTool class " + impl.trim() + " failed with exception", e);
+          LOG.error("SyncTool class {0} failed with exception {1}",  impl.trim(), e);
           failedMetaSyncs.put(impl, e);
         }
         long metaSyncTimeMs = syncContext != null ? syncContext.stop() : 0;
         metrics.updateStreamerMetaSyncMetrics(getSyncClassShortName(impl), metaSyncTimeMs);
         if (success) {
-          LOG.info("[MetaSync] SyncTool class " + impl.trim() + " completed successfully and took " + metaSyncTimeMs);
+          LOG.info("[MetaSync] SyncTool class {0} completed successfully and took {1} ", impl.trim(), metaSyncTimeMs);
         }
       }
       if (!failedMetaSyncs.isEmpty()) {