doc/data_flow_realtime.dot

digraph DruidDataFlow {
        graph [bgcolor="#fffef5", clusterrank=global, rankdir=TB];
        node [color="#0a0701", fillcolor="#fdf4c6", fontname=Helvetica, shape=box, style=filled, label="\N"];
        edge [color="#377d18"];

  1 [label = "REST query"];
  2 [label = "realtime_data_src"];
  4 [label = "indexed segments\nblob_store (S3, HDFS)"];
  5 [label = "Realtime.working_set"];
  6 [label = "Realtime.spill_disk"];
  7 [label = "HDFS_data_src"];
  8 [label = "external_data_src"];
  9 [label = "Realtime.local_disk"];
 10 [label = "metadata_store (mysql)"];
 11 [label = "HadoopDruidIndexer.working_set"];
 12 [label = "IndexerService.working_set"];

2 -> 5 [label = "Realtime.Firehose"];
5 -> 6 [label = "Realtime.Firehose"];

5 -> 9 [label = "Realtime.Indexer"];
6 -> 9 [label = "Realtime.Indexer"];
5 -> 10 [label = "Realtime.MetadataUpdater"];

7 -> 11 [label = "HadoopDruidIndexer"];
11 -> 4 [label = "HadoopDruidIndexer"];
11 -> 10 [label = "HadoopDruidIndexer"];

8 -> 12 [label = "IndexerService"];
12 -> 4 [label = "IndexerService"];
12 -> 10 [label = "IndexerService"];


9 -> 4 [label = "Realtime.segmentPusher"];

5 -> 1  [label = " results "];

1 -> 5 [label = " query "];
}