我对OpenTSDB的一些理解——HBase rowkey生成规则。

static byte[] rowKeyTemplate(final TSDB tsdb, final String metric,
    final Map<String, String> tags) {
  final short metric_width = tsdb.metrics.width();
  final short tag_name_width = tsdb.tag_names.width();
  final short tag_value_width = tsdb.tag_values.width();
  final short num_tags = (short) tags.size();

  int row_size = (Const.SALT_WIDTH() + metric_width + Const.TIMESTAMP_BYTES 
      + tag_name_width * num_tags + tag_value_width * num_tags);
  final byte[] row = new byte[row_size];

  short pos = (short) Const.SALT_WIDTH();

  copyInRowKey(row, pos,
      (tsdb.config.auto_metric() ? tsdb.metrics.getOrCreateId(metric)
          : tsdb.metrics.getId(metric)));
  pos += metric_width;

  pos += Const.TIMESTAMP_BYTES;

  for (final byte[] tag : Tags.resolveOrCreateAll(tsdb, tags)) {
    copyInRowKey(row, pos, tag);
    pos += tag.length;
  }
  return row;
}