Github user Ethanlm commented on the issue:
https://github.com/apache/storm/pull/2270
Performance testing on `ConstSpoutNullBoltTopo`.
1. Config: `topology.message.timeout: 300`; `topology.max.spout.pending:
5000`;
2. Launched `4 workers`, `4 spout tasks` and `4 bolt tasks`. `ACKing`
enabled.
3. All experiments ran 300s.
4. For clarity, only show the outputs at `240s`.
5. Numbers fluctuate slightly during the experiments.
#### Experiment 1: No additional network latency
Grouping | spout_transferred | spout_acks | spout_throughput (acks/s) |
spout_avg_complete_latency(ms)
-- | -- | -- | -- | --
LocalityASG | 39121580 | 39130540 | 652026 | 1.9
LocalOrShuffle(loadaware disabled) | 36964380 | 36967160 | 616073 | 1.9
Shuffle (loadaware disabled) | 35742880 | 35735960 | 595714 | 4.8
LocalOrShuffle | 37432840 | 37436600 | 623880 | 1.9
Shuffle | 29940520 | 29940460 | 499008 | 4.5
#### Experiment 2: 20ms network latency
Grouping | spout_transferred | spout_acks | spout_throughput (acks/s) |
spout_avg_complete_latency(ms)
-- | -- | -- | -- | --
LocalityASG | 34551480 | 34548700 | 575858 | 1.8
LocalOrShuffle(loadaware disabled) | 34449860 | 34448900 | 574164 | 1.8
Shuffle (loadaware disabled) | 24112300 | 24106480 | 401871 | 18.5
LocalOrShuffle | 34506780 | 34510500 | 575113 | 1.8
Shuffle | 24494900 | 24503020 | 408248 | 18.5
#### Experiment 3: 100ms network latency
Grouping | spout_transferred | spout_acks | spout_throughput (acks/s) |
spout_avg_complete_latency(ms)
-- | -- | -- | -- | --
LocalityASG | 7265280 | 7262440 | 121088 | 2.5
LocalOrShuffle(loadaware disabled) | 7256840 | 7250180 | 120947 | 2.5
Shuffle (loadaware disabled) | 5085420 | 5084960 | 84757 | 94
LocalOrShuffle | 7235960 | 7245760 | 120599 | 2.6
Shuffle | 4189880 | 4186640 | 69831 | 89.1
Conclusion:
1. `LocalityASG` is similar to `LocalOrShuffle` in this case which is as
expected.
2. `LocalityASG` and `LocalOrShuffle` is less effected by network latency
than `Shuffle`
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