@Override
  public void writeAll(Iterable<? extends Map.Entry<? extends TimelineAppMetricCacheKey, ? extends TimelineMetricsCacheValue>> entries) throws BulkCacheWritingException, Exception {
//    no need to implement.
  }
Time shift by a constant taking into account Epoch vs millis
ambari-server/src/main/java/org/apache/ambari/server/controller/metrics/timeline/cache/TimelineMetricCacheEntryFactory.java