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wfgilman / pipeline-test

Example application of GenStage pipeline resiliency

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Pipeline

Prototype for handling GenStage producer_consumer crashes.

Dynamically named and linked stages recover successfully from random crashes provided the :max_restarts and :max_seconds count is high enough! In this prototype :max_restarts is set to 10.

Trying it out

$ git clone ...
$ cd pipeline
$ mix do deps.get, compile

In action

You can see the 5 HTTP.Requestor producer_consumers subscribe to the producer on startup, followed by the DB.Loader consumers.

Each HTTP.Requestor takes 10 events, so 5 are processing concurrently. You can see below that after the 67th event is processed, the HTTPRequestor5 crashes, and appears to take down the three DB.Loader consumers with it.

However, you can see in the console that HTTPRequestor5 resubscribes to the producer immediately followed by the three DB.Loader consumers subscribing to it. They begin processing events soon after.

$iex -S mix
Erlang/OTP 19 [erts-8.2] [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false] [dtrace]

Compiling 1 file (.ex)
Elixir.Pipeline.HTTPRequestor1 subscribed!
Elixir.Pipeline.HTTPRequestor2 subscribed!
Elixir.Pipeline.HTTPRequestor3 subscribed!
Elixir.Pipeline.HTTPRequestor4 subscribed!
Elixir.Pipeline.HTTPRequestor5 subscribed!
Elixir.Pipeline.DBLoader1 subscribed!
Elixir.Pipeline.DBLoader2 subscribed!
Elixir.Pipeline.DBLoader3 subscribed!
Interactive Elixir (1.4.0) - press Ctrl+C to exit (type h() ENTER for help)
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
[11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
[21, 22, 23, 24, 25, 26, 27, 28, 29, 30]
[31, 32, 33, 34, 35, 36, 37, 38, 39, 40]
')*+,-./012'
iex(1)> Processed by Elixir.Pipeline.HTTPRequestor1: 1
Processed by Elixir.Pipeline.HTTPRequestor2: 11
Processed by Elixir.Pipeline.HTTPRequestor4: 31
Processed by Elixir.Pipeline.HTTPRequestor3: 21
Processed by Elixir.Pipeline.HTTPRequestor5: 41
Processed by Elixir.Pipeline.HTTPRequestor1: 2
Processed by Elixir.Pipeline.HTTPRequestor2: 12
Processed by Elixir.Pipeline.HTTPRequestor4: 32
Processed by Elixir.Pipeline.HTTPRequestor3: 22
Processed by Elixir.Pipeline.HTTPRequestor5: 42
Processed by Elixir.Pipeline.HTTPRequestor1: 3
Processed by Elixir.Pipeline.HTTPRequestor2: 13
Processed by Elixir.Pipeline.HTTPRequestor4: 33
Processed by Elixir.Pipeline.HTTPRequestor3: 23
Processed by Elixir.Pipeline.HTTPRequestor5: 43
Processed by Elixir.Pipeline.HTTPRequestor1: 4
Processed by Elixir.Pipeline.HTTPRequestor2: 14
Processed by Elixir.Pipeline.HTTPRequestor4: 34
Processed by Elixir.Pipeline.HTTPRequestor3: 24
Processed by Elixir.Pipeline.HTTPRequestor5: 44
Processed by Elixir.Pipeline.HTTPRequestor1: 5
'34567'
Processed by Elixir.Pipeline.HTTPRequestor4: 35
Processed by Elixir.Pipeline.HTTPRequestor3: 25
'89:;<'
'=>?@A'
Elixir.Pipeline.HTTPRequestor2 subscribed!
'BCDEFGHIJK'
Elixir.Pipeline.DBLoader3 subscribed!
Processed by Elixir.Pipeline.HTTPRequestor5: 45
'LMNOP'

16:53:32.419 [error] GenServer Pipeline.HTTPRequestor2 terminating
** (RuntimeError) Elixir.Pipeline.HTTPRequestor2 just Crashed
    (pipeline) lib/pipeline/http_requestor.ex:21: anonymous fn/3 in Pipeline.HTTPRequestor.handle_events/3
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    (pipeline) lib/pipeline/http_requestor.ex:18: Pipeline.HTTPRequestor.handle_events/3
    (gen_stage) lib/gen_stage.ex:2408: GenStage.consumer_dispatch/7
    (gen_stage) lib/gen_stage.ex:2531: GenStage.take_pc_events/3
    (stdlib) gen_server.erl:601: :gen_server.try_dispatch/4
    (stdlib) gen_server.erl:667: :gen_server.handle_msg/5
    (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
Last message: {:"$gen_consumer", {#PID<0.166.0>, #Reference<0.0.1.370>}, [11, 12, 13, 14, 15, 16, 17, 18, 19, 20]}
State: Pipeline.HTTPRequestor2

16:53:32.423 [error] GenServer Pipeline.DBLoader3 terminating
** (RuntimeError) Elixir.Pipeline.HTTPRequestor2 just Crashed
    (pipeline) lib/pipeline/http_requestor.ex:21: anonymous fn/3 in Pipeline.HTTPRequestor.handle_events/3
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    (pipeline) lib/pipeline/http_requestor.ex:18: Pipeline.HTTPRequestor.handle_events/3
    (gen_stage) lib/gen_stage.ex:2408: GenStage.consumer_dispatch/7
    (gen_stage) lib/gen_stage.ex:2531: GenStage.take_pc_events/3
    (stdlib) gen_server.erl:601: :gen_server.try_dispatch/4
    (stdlib) gen_server.erl:667: :gen_server.handle_msg/5
    (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
Last message: {:DOWN, #Reference<0.0.1.406>, :process, #PID<0.168.0>, {%RuntimeError{message: "Elixir.Pipeline.HTTPRequestor2 just Crashed"}, [{Pipeline.HTTPRequestor, :"-handle_events/3-fun-0-", 3, [file: 'lib/pipeline/http_requestor.ex', line: 21]}, {Enum, :"-reduce/3-lists^foldl/2-0-", 3, [file: 'lib/enum.ex', line: 1755]}, {Pipeline.HTTPRequestor, :handle_events, 3, [file: 'lib/pipeline/http_requestor.ex', line: 18]}, {GenStage, :consumer_dispatch, 7, [file: 'lib/gen_stage.ex', line: 2408]}, {GenStage, :take_pc_events, 3, [file: 'lib/gen_stage.ex', line: 2531]}, {:gen_server, :try_dispatch, 4, [file: 'gen_server.erl', line: 601]}, {:gen_server, :handle_msg, 5, [file: 'gen_server.erl', line: 667]}, {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 247]}]}}
State: Pipeline.DBLoader3
Processed by Elixir.Pipeline.HTTPRequestor1: 4 |> Processed by Elixir.Pipeline.DBLoader2
Processed by Elixir.Pipeline.HTTPRequestor1: 1 |> Processed by Elixir.Pipeline.DBLoader1
Processed by Elixir.Pipeline.HTTPRequestor1: 5 |> Processed by Elixir.Pipeline.DBLoader2
Processed by Elixir.Pipeline.HTTPRequestor1: 2 |> Processed by Elixir.Pipeline.DBLoader1
Processed by Elixir.Pipeline.HTTPRequestor4: 34 |> Processed by Elixir.Pipeline.DBLoader2
Processed by Elixir.Pipeline.HTTPRequestor1: 3 |> Processed by Elixir.Pipeline.DBLoader1
Processed by Elixir.Pipeline.HTTPRequestor1: 6
Processed by Elixir.Pipeline.HTTPRequestor4: 36
Processed by Elixir.Pipeline.HTTPRequestor3: 26
Processed by Elixir.Pipeline.HTTPRequestor2: 66
Processed by Elixir.Pipeline.HTTPRequestor5: 46
Processed by Elixir.Pipeline.HTTPRequestor4: 35 |> Processed by Elixir.Pipeline.DBLoader2
Processed by Elixir.Pipeline.HTTPRequestor4: 31 |> Processed by Elixir.Pipeline.DBLoader1
Processed by Elixir.Pipeline.HTTPRequestor3: 24 |> Processed by Elixir.Pipeline.DBLoader2
Processed by Elixir.Pipeline.HTTPRequestor4: 32 |> Processed by Elixir.Pipeline.DBLoader1
Processed by Elixir.Pipeline.HTTPRequestor3: 25 |> Processed by Elixir.Pipeline.DBLoader2
Processed by Elixir.Pipeline.HTTPRequestor4: 33 |> Processed by Elixir.Pipeline.DBLoader1
Elixir.Pipeline.DBLoader2 subscribed!

16:53:35.414 [error] GenServer Pipeline.DBLoader2 terminating
** (RuntimeError) Elixir.Pipeline.HTTPRequestor2 just Crashed
    (pipeline) lib/pipeline/http_requestor.ex:21: anonymous fn/3 in Pipeline.HTTPRequestor.handle_events/3
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    (pipeline) lib/pipeline/http_requestor.ex:18: Pipeline.HTTPRequestor.handle_events/3
    (gen_stage) lib/gen_stage.ex:2408: GenStage.consumer_dispatch/7
    (gen_stage) lib/gen_stage.ex:2531: GenStage.take_pc_events/3
    (stdlib) gen_server.erl:601: :gen_server.try_dispatch/4
    (stdlib) gen_server.erl:667: :gen_server.handle_msg/5
    (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
Last message: {:DOWN, #Reference<0.0.1.395>, :process, #PID<0.168.0>, {%RuntimeError{message: "Elixir.Pipeline.HTTPRequestor2 just Crashed"}, [{Pipeline.HTTPRequestor, :"-handle_events/3-fun-0-", 3, [file: 'lib/pipeline/http_requestor.ex', line: 21]}, {Enum, :"-reduce/3-lists^foldl/2-0-", 3, [file: 'lib/enum.ex', line: 1755]}, {Pipeline.HTTPRequestor, :handle_events, 3, [file: 'lib/pipeline/http_requestor.ex', line: 18]}, {GenStage, :consumer_dispatch, 7, [file: 'lib/gen_stage.ex', line: 2408]}, {GenStage, :take_pc_events, 3, [file: 'lib/gen_stage.ex', line: 2531]}, {:gen_server, :try_dispatch, 4, [file: 'gen_server.erl', line: 601]}, {:gen_server, :handle_msg, 5, [file: 'gen_server.erl', line: 667]}, {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 247]}]}}
State: Pipeline.DBLoader2
Processed by Elixir.Pipeline.HTTPRequestor3: 21 |> Processed by Elixir.Pipeline.DBLoader1
Processed by Elixir.Pipeline.HTTPRequestor1: 7
Processed by Elixir.Pipeline.HTTPRequestor4: 37
Processed by Elixir.Pipeline.HTTPRequestor3: 27
Processed by Elixir.Pipeline.HTTPRequestor2: 67
Elixir.Pipeline.HTTPRequestor5 subscribed!
Elixir.Pipeline.DBLoader2 subscribed!
'QRSTUVWXYZ'
Elixir.Pipeline.DBLoader3 subscribed!

16:53:36.412 [error] GenServer Pipeline.HTTPRequestor5 terminating
** (RuntimeError) Elixir.Pipeline.HTTPRequestor5 just Crashed
    (pipeline) lib/pipeline/http_requestor.ex:21: anonymous fn/3 in Pipeline.HTTPRequestor.handle_events/3
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    (pipeline) lib/pipeline/http_requestor.ex:18: Pipeline.HTTPRequestor.handle_events/3
    (gen_stage) lib/gen_stage.ex:2408: GenStage.consumer_dispatch/7
    (gen_stage) lib/gen_stage.ex:2531: GenStage.take_pc_events/3
    (stdlib) gen_server.erl:601: :gen_server.try_dispatch/4
    (stdlib) gen_server.erl:667: :gen_server.handle_msg/5
    (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
Last message: {:"$gen_consumer", {#PID<0.166.0>, #Reference<0.0.1.379>}, ')*+,-./012'}
State: Pipeline.HTTPRequestor5

16:53:36.413 [error] GenServer Pipeline.DBLoader2 terminating
** (RuntimeError) Elixir.Pipeline.HTTPRequestor5 just Crashed
    (pipeline) lib/pipeline/http_requestor.ex:21: anonymous fn/3 in Pipeline.HTTPRequestor.handle_events/3
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    (pipeline) lib/pipeline/http_requestor.ex:18: Pipeline.HTTPRequestor.handle_events/3
    (gen_stage) lib/gen_stage.ex:2408: GenStage.consumer_dispatch/7
    (gen_stage) lib/gen_stage.ex:2531: GenStage.take_pc_events/3
    (stdlib) gen_server.erl:601: :gen_server.try_dispatch/4
    (stdlib) gen_server.erl:667: :gen_server.handle_msg/5
    (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
Last message: {:DOWN, #Reference<0.0.2.1092>, :process, #PID<0.171.0>, {%RuntimeError{message: "Elixir.Pipeline.HTTPRequestor5 just Crashed"}, [{Pipeline.HTTPRequestor, :"-handle_events/3-fun-0-", 3, [file: 'lib/pipeline/http_requestor.ex', line: 21]}, {Enum, :"-reduce/3-lists^foldl/2-0-", 3, [file: 'lib/enum.ex', line: 1755]}, {Pipeline.HTTPRequestor, :handle_events, 3, [file: 'lib/pipeline/http_requestor.ex', line: 18]}, {GenStage, :consumer_dispatch, 7, [file: 'lib/gen_stage.ex', line: 2408]}, {GenStage, :take_pc_events, 3, [file: 'lib/gen_stage.ex', line: 2531]}, {:gen_server, :try_dispatch, 4, [file: 'gen_server.erl', line: 601]}, {:gen_server, :handle_msg, 5, [file: 'gen_server.erl', line: 667]}, {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 247]}]}}
State: Pipeline.DBLoader2

16:53:36.414 [error] GenServer Pipeline.DBLoader3 terminating
** (RuntimeError) Elixir.Pipeline.HTTPRequestor5 just Crashed
    (pipeline) lib/pipeline/http_requestor.ex:21: anonymous fn/3 in Pipeline.HTTPRequestor.handle_events/3
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    (pipeline) lib/pipeline/http_requestor.ex:18: Pipeline.HTTPRequestor.handle_events/3
    (gen_stage) lib/gen_stage.ex:2408: GenStage.consumer_dispatch/7
    (gen_stage) lib/gen_stage.ex:2531: GenStage.take_pc_events/3
    (stdlib) gen_server.erl:601: :gen_server.try_dispatch/4
    (stdlib) gen_server.erl:667: :gen_server.handle_msg/5
    (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
Last message: {:DOWN, #Reference<0.0.3.66>, :process, #PID<0.171.0>, {%RuntimeError{message: "Elixir.Pipeline.HTTPRequestor5 just Crashed"}, [{Pipeline.HTTPRequestor, :"-handle_events/3-fun-0-", 3, [file: 'lib/pipeline/http_requestor.ex', line: 21]}, {Enum, :"-reduce/3-lists^foldl/2-0-", 3, [file: 'lib/enum.ex', line: 1755]}, {Pipeline.HTTPRequestor, :handle_events, 3, [file: 'lib/pipeline/http_requestor.ex', line: 18]}, {GenStage, :consumer_dispatch, 7, [file: 'lib/gen_stage.ex', line: 2408]}, {GenStage, :take_pc_events, 3, [file: 'lib/gen_stage.ex', line: 2531]}, {:gen_server, :try_dispatch, 4, [file: 'gen_server.erl', line: 601]}, {:gen_server, :handle_msg, 5, [file: 'gen_server.erl', line: 667]}, {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 247]}]}}
State: Pipeline.DBLoader3
Processed by Elixir.Pipeline.HTTPRequestor3: 22 |> Processed by Elixir.Pipeline.DBLoader1
Processed by Elixir.Pipeline.HTTPRequestor3: 23 |> Processed by Elixir.Pipeline.DBLoader1
Elixir.Pipeline.DBLoader1 subscribed!

16:53:36.917 [error] GenServer Pipeline.DBLoader1 terminating
** (RuntimeError) Elixir.Pipeline.HTTPRequestor2 just Crashed
    (pipeline) lib/pipeline/http_requestor.ex:21: anonymous fn/3 in Pipeline.HTTPRequestor.handle_events/3
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    (pipeline) lib/pipeline/http_requestor.ex:18: Pipeline.HTTPRequestor.handle_events/3
    (gen_stage) lib/gen_stage.ex:2408: GenStage.consumer_dispatch/7
    (gen_stage) lib/gen_stage.ex:2531: GenStage.take_pc_events/3
    (stdlib) gen_server.erl:601: :gen_server.try_dispatch/4
    (stdlib) gen_server.erl:667: :gen_server.handle_msg/5
    (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
Last message: {:DOWN, #Reference<0.0.1.384>, :process, #PID<0.168.0>, {%RuntimeError{message: "Elixir.Pipeline.HTTPRequestor2 just Crashed"}, [{Pipeline.HTTPRequestor, :"-handle_events/3-fun-0-", 3, [file: 'lib/pipeline/http_requestor.ex', line: 21]}, {Enum, :"-reduce/3-lists^foldl/2-0-", 3, [file: 'lib/enum.ex', line: 1755]}, {Pipeline.HTTPRequestor, :handle_events, 3, [file: 'lib/pipeline/http_requestor.ex', line: 18]}, {GenStage, :consumer_dispatch, 7, [file: 'lib/gen_stage.ex', line: 2408]}, {GenStage, :take_pc_events, 3, [file: 'lib/gen_stage.ex', line: 2531]}, {:gen_server, :try_dispatch, 4, [file: 'gen_server.erl', line: 601]}, {:gen_server, :handle_msg, 5, [file: 'gen_server.erl', line: 667]}, {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 247]}]}}
State: Pipeline.DBLoader1
Processed by Elixir.Pipeline.HTTPRequestor1: 8
Processed by Elixir.Pipeline.HTTPRequestor4: 38
Processed by Elixir.Pipeline.HTTPRequestor3: 28
Processed by Elixir.Pipeline.HTTPRequestor2: 68
Processed by Elixir.Pipeline.HTTPRequestor5: 81
Processed by Elixir.Pipeline.HTTPRequestor1: 9
Processed by Elixir.Pipeline.HTTPRequestor4: 39
Processed by Elixir.Pipeline.HTTPRequestor3: 29
Processed by Elixir.Pipeline.HTTPRequestor2: 69
Processed by Elixir.Pipeline.HTTPRequestor5: 82
Processed by Elixir.Pipeline.HTTPRequestor1: 10
'[\\]^_'
Processed by Elixir.Pipeline.HTTPRequestor4: 40
Processed by Elixir.Pipeline.HTTPRequestor3: 30
'`abcd'
[]
Processed by Elixir.Pipeline.HTTPRequestor2: 70
[]
Processed by Elixir.Pipeline.HTTPRequestor5: 83
Processed by Elixir.Pipeline.HTTPRequestor1: 51
Processed by Elixir.Pipeline.HTTPRequestor4: 56
Processed by Elixir.Pipeline.HTTPRequestor3: 61
Processed by Elixir.Pipeline.HTTPRequestor2: 71
Processed by Elixir.Pipeline.HTTPRequestor5: 84
Processed by Elixir.Pipeline.HTTPRequestor1: 52
Processed by Elixir.Pipeline.HTTPRequestor4: 57
Processed by Elixir.Pipeline.HTTPRequestor3: 62
Processed by Elixir.Pipeline.HTTPRequestor2: 72
Processed by Elixir.Pipeline.HTTPRequestor5: 85
[]
Processed by Elixir.Pipeline.HTTPRequestor5: 81 |> Processed by Elixir.Pipeline.DBLoader2
Processed by Elixir.Pipeline.HTTPRequestor5: 82 |> Processed by Elixir.Pipeline.DBLoader2
Processed by Elixir.Pipeline.HTTPRequestor5: 83 |> Processed by Elixir.Pipeline.DBLoader2
Processed by Elixir.Pipeline.HTTPRequestor1: 53
Processed by Elixir.Pipeline.HTTPRequestor4: 58
Processed by Elixir.Pipeline.HTTPRequestor3: 63
Processed by Elixir.Pipeline.HTTPRequestor2: 73
Processed by Elixir.Pipeline.HTTPRequestor5: 86
Processed by Elixir.Pipeline.HTTPRequestor1: 54
Processed by Elixir.Pipeline.HTTPRequestor4: 59
Processed by Elixir.Pipeline.HTTPRequestor3: 64
Processed by Elixir.Pipeline.HTTPRequestor2: 74
Processed by Elixir.Pipeline.HTTPRequestor5: 87
Processed by Elixir.Pipeline.HTTPRequestor1: 55
[]
Processed by Elixir.Pipeline.HTTPRequestor4: 60
Processed by Elixir.Pipeline.HTTPRequestor3: 65
[]
[]
Processed by Elixir.Pipeline.HTTPRequestor2: 75
[]
Processed by Elixir.Pipeline.HTTPRequestor5: 88
Processed by Elixir.Pipeline.HTTPRequestor2: 72 |> Processed by Elixir.Pipeline.DBLoader2
Processed by Elixir.Pipeline.HTTPRequestor2: 75 |> Processed by Elixir.Pipeline.DBLoader3
Processed by Elixir.Pipeline.HTTPRequestor2: 73 |> Processed by Elixir.Pipeline.DBLoader2
Processed by Elixir.Pipeline.HTTPRequestor2: 74 |> Processed by Elixir.Pipeline.DBLoader2
Processed by Elixir.Pipeline.HTTPRequestor1: 91
Processed by Elixir.Pipeline.HTTPRequestor4: 96
Processed by Elixir.Pipeline.HTTPRequestor5: 89
Processed by Elixir.Pipeline.HTTPRequestor1: 92
Processed by Elixir.Pipeline.HTTPRequestor4: 97
Processed by Elixir.Pipeline.HTTPRequestor5: 90
[]
Processed by Elixir.Pipeline.HTTPRequestor5: 84 |> Processed by Elixir.Pipeline.DBLoader3
Processed by Elixir.Pipeline.HTTPRequestor5: 87 |> Processed by Elixir.Pipeline.DBLoader1
Processed by Elixir.Pipeline.HTTPRequestor5: 90 |> Processed by Elixir.Pipeline.DBLoader2
Processed by Elixir.Pipeline.HTTPRequestor5: 85 |> Processed by Elixir.Pipeline.DBLoader3
Processed by Elixir.Pipeline.HTTPRequestor5: 88 |> Processed by Elixir.Pipeline.DBLoader1
Processed by Elixir.Pipeline.HTTPRequestor5: 86 |> Processed by Elixir.Pipeline.DBLoader3
Elixir.Pipeline.DBLoader1 subscribed!

16:53:57.925 [error] GenServer Pipeline.DBLoader1 terminating
** (RuntimeError) Elixir.Pipeline.DBLoader1 just Crashed!
    (pipeline) lib/pipeline/db_loader.ex:24: anonymous fn/3 in Pipeline.DBLoader.handle_events/3
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    (pipeline) lib/pipeline/db_loader.ex:21: Pipeline.DBLoader.handle_events/3
    (gen_stage) lib/gen_stage.ex:2408: GenStage.consumer_dispatch/7
    (gen_stage) lib/gen_stage.ex:1949: GenStage.handle_info/2
    (stdlib) gen_server.erl:601: :gen_server.try_dispatch/4
    (stdlib) gen_server.erl:667: :gen_server.handle_msg/5
    (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
Last message: {:"$gen_consumer", {#PID<0.180.0>, #Reference<0.0.2.1123>}, ["Processed by Elixir.Pipeline.HTTPRequestor5: 87", "Processed by Elixir.Pipeline.HTTPRequestor5: 88", "Processed by Elixir.Pipeline.HTTPRequestor5: 89"]}
State: Pipeline.DBLoader1
Processed by Elixir.Pipeline.HTTPRequestor1: 93
Processed by Elixir.Pipeline.HTTPRequestor4: 98
Processed by Elixir.Pipeline.HTTPRequestor1: 94
Processed by Elixir.Pipeline.HTTPRequestor4: 99
Processed by Elixir.Pipeline.HTTPRequestor1: 95
[]
Processed by Elixir.Pipeline.HTTPRequestor4: 100
[]
Processed by Elixir.Pipeline.HTTPRequestor1: 94 |> Processed by Elixir.Pipeline.DBLoader2
Processed by Elixir.Pipeline.HTTPRequestor1: 95 |> Processed by Elixir.Pipeline.DBLoader2

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Example application of GenStage pipeline resiliency

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