@Override
  public boolean isBulkLoadResult() {
    return StoreFileInfo.hasBulkloadSeqId(this.getPath())
      || (metadataMap != null && metadataMap.containsKey(BULKLOAD_TIME_KEY));
  }
@param key to look up
@return value associated with the metadata key
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HStoreFile.java