# Package org.apache.storm.perf

- Class Summary
  Class | Description
  --- | ---
  BackPressureTopo |
  ConstSpoutIdBoltNullBoltTopo | ConstSpout -> IdBolt -> DevNullBolt This topology measures speed of messaging between spouts->bolt and bolt->bolt ConstSpout : Continuously emits a constant string IdBolt : clones and emits input tuples DevNullBolt : discards incoming tuples.
  ConstSpoutNullBoltTopo | This topo helps measure the messaging peak throughput between a spout and a bolt.
  ConstSpoutOnlyTopo | This topo helps measure how fast a spout can produce data (so no bolts are attached).
  FileReadWordCountTopo | This topo helps measure speed of word count.
  HdfsSpoutNullBoltTopo | This topo helps measure speed of reading from Hdfs.
  KafkaClientHdfsTopo | This topo helps measure speed of reading from Kafka and writing to Hdfs.
  KafkaClientHdfsTopo.LineWriter |
  KafkaClientSpoutNullBoltTopo | Benchmark topology for measuring spout read/emit/ack performance.
  LowThroughputTopo |
  SimplifiedWordCountTopo |
  StrGenSpoutHdfsBoltTopo | This topo helps measure speed of writing to Hdfs.
  StrGenSpoutHdfsBoltTopo.LineWriter |
  ThroughputMeter |