[server] Remove annoy useless logging and improve log information

Author: wuchong

fluss-server/src/main/java/com/alibaba/fluss/server/authorizer/DefaultAuthorizer.java

@@ -695,5 +695,10 @@ public VersionedAcls(int zkVersion, Set<AccessControlEntry> acls) {
         boolean exists() {
             return zkVersion != UNKNOWN_VERSION;
         }
+
+        @Override
+        public String toString() {
+            return "VersionedAcls{" + "acls=" + acls + ", zkVersion=" + zkVersion + '}';
+        }
     }
 }

fluss-server/src/main/java/com/alibaba/fluss/server/authorizer/ZkNodeChangeNotificationWatcher.java

@@ -100,7 +100,6 @@ private void processNotifications() {
                 List<String> notifications = zooKeeperClient.getChildren(seqNodeRoot);
                 Collections.sort(notifications);
                 if (!notifications.isEmpty()) {
-                    LOG.info("Processing notifications for path = {}", seqNodeRoot);
                     long now = clock.milliseconds();
                     for (String notification : notifications) {
                         long changeId = changeNumber(notification);

fluss-server/src/main/java/com/alibaba/fluss/server/tablet/TabletService.java

@@ -348,7 +348,9 @@ private void authorizeTable(OperationType operationType, long tableId) {
         PhysicalTablePath tablePath = metadataCache.getTablePath(tableId);
         if (tablePath == null) {
             throw new UnknownTableOrBucketException(
-                    String.format("This server does not host this table ID %s.", tableId));
+                    String.format(
+                            "This server %s does not host this table ID %s. This may happen when the table metadata cache in the server is not updated yet.",
+                            serviceName, tableId));
         }
         if (authorizer != null
                 && !authorizer.isAuthorized(
@@ -390,8 +392,9 @@ private <T, K extends ResultForBucket> Map<TableBucket, T> authorizeRequestData(
                                         new ApiError(
                                                 Errors.UNKNOWN_TABLE_OR_BUCKET_EXCEPTION,
                                                 String.format(
-                                                        "This server does not host this table ID %s.",
-                                                        tableId))));
+                                                        "This server %s does not host this table ID %s. "
+                                                                + "This may happen when the table metadata cache in the server is not updated yet.",
+                                                        serviceName, tableId))));
                     } else if (!filteredTableIds.contains(tableId)) {
                         errorResponseMap.put(
                                 tableBucket,

fluss-server/src/main/java/com/alibaba/fluss/server/zk/ZooKeeperClient.java

@@ -783,7 +783,6 @@ public List<String> getChildren(String path) throws Exception {
     public Optional<Stat> getStat(String path) throws Exception {
         try {
             Stat stat = zkClient.checkExists().forPath(path);
-            LOG.info("stat of path {} is {}", path, stat);
             return Optional.of(stat);
         } catch (KeeperException.NoNodeException e) {
             return Optional.empty();