Fix reload meta (#12)

* fix meta * debug path * prevent same timestamp for metadata persistence * remove debug logs

Author: liuruiyiyang

src/main/java/cn/edu/tsinghua/iotdb/kairosdb/dao/MetricsManager.java

@@ -79,9 +79,13 @@ public static void loadMetadata() {
  String name = rs.getString(2);
  String tagName = rs.getString(3);
  Integer pos = rs.getInt(4);
- tagOrder.computeIfAbsent(name, k -> new HashMap<>());
- Map<String, Integer> temp = tagOrder.get(name);
- temp.put(tagName, pos);
+ if(tagOrder.containsKey(name)){
+ tagOrder.get(name).put(tagName, pos);
+ } else {
+ Map<String, Integer> map = new HashMap<>();
+ map.put(tagName, pos);
+ tagOrder.put(name, map);
+ }
  }
 
  // Read the size of storage group
@@ -312,7 +316,13 @@ public static HashMap<Integer, String> getMapping(String name, Map<String, Strin
  */
  private static void persistMappingCache(String metricName, Map<String, Integer> cache) {
  for (Map.Entry<String, Integer> entry : cache.entrySet()) {
- long timestamp = new Date().getTime();
+ long timestamp = System.currentTimeMillis();
+ try {
+ Thread.sleep(1);
+ } catch (InterruptedException e) {
+ LOGGER.error("", e);
+ Thread.currentThread().interrupt();
+ }
  String sql = String.format(
  "insert into root.SYSTEM.TAG_NAME_INFO(timestamp, metric_name, tag_name, tag_order) values(%s, \"%s\", \"%s\", %s);",
  timestamp, metricName, entry.getKey(), entry.getValue());