Module: RocketJob::Batch::Worker

Extended by:
ActiveSupport::Concern
Included in:
RocketJob::Batch
Defined in:
lib/rocket_job/batch/worker.rb

Instance Method Summary collapse

Instance Method Details

#rocket_job_active_workers(server_name = nil) ⇒ Object

Returns [Array<ActiveWorker>] All workers actively working on this job



96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
# File 'lib/rocket_job/batch/worker.rb', line 96

def rocket_job_active_workers(server_name = nil)
  servers = []
  case sub_state
  when :before, :after
    if running? && (server_name.nil? || worker_on_server?(server_name))
      servers << ActiveWorker.new(worker_name, started_at, self)
    end
  when :processing
    query = input.running
    query = query.where(worker_name: /\A#{server_name}/) if server_name
    query.each do |slice|
      servers << ActiveWorker.new(slice.worker_name, slice.started_at, self)
    end
  end
  servers
end

#rocket_job_batch_callbacks(worker) ⇒ Object

Run Batch before and after callbacks



310
311
312
313
314
315
316
317
318
319
320
# File 'lib/rocket_job/batch/worker.rb', line 310

def rocket_job_batch_callbacks(worker)
  # If this is the first worker to pickup this job
  case sub_state
  when :before
    rocket_job_batch_run_before_callbacks
    # Check for 0 record jobs
    rocket_job_batch_complete?(worker.name) if running?
  when sub_state == :after
    rocket_job_batch_run_after_callbacks
  end
end

#rocket_job_batch_complete?(worker_name) ⇒ Boolean

Checks for completion and runs after_batch if defined Returns true if the job is now complete/aborted/failed

Returns:

  • (Boolean)


201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
# File 'lib/rocket_job/batch/worker.rb', line 201

def rocket_job_batch_complete?(worker_name)
  return true unless running?
  return false unless record_count

  # Only failed slices left?
  input_count  = input.count
  failed_count = input.failed.count
  if failed_count.positive? && (input_count == failed_count)
    # Reload to pull in any counters or other data that was modified.
    reload unless new_record?
    rocket_job_batch_fail!(worker_name) if may_fail?
    return true
  end

  # Any work left?
  return false if input_count.positive?

  # If the job was not saved to the queue, do not save any changes
  if new_record?
    rocket_job_batch_run_after_callbacks(false)
    return true
  end

  # Complete job iff no other worker has already completed it
  # Must set write concern to at least 1 since we need the nModified back
  result = self.class.with(write: {w: 1}) do |query|
    query.
      where(id: id, state: :running, sub_state: :processing).
      update("$set" => {sub_state: "after", worker_name: worker_name})
  end

  # Reload to pull in any counters or other data that was modified.
  reload

  if result.modified_count.positive?
    rocket_job_batch_run_after_callbacks(false)
  elsif aborted?
    # Repeat cleanup in case this worker was still running when the job was aborted
    cleanup!
  end
  true
end

#rocket_job_batch_fail!(worker_name) ⇒ Object

Fail the job



245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
# File 'lib/rocket_job/batch/worker.rb', line 245

def rocket_job_batch_fail!(worker_name)
  fail_job = true

  unless new_record?
    # Fail job iff no other worker has already finished it
    # Must set write concern to at least 1 since we need the nModified back
    result   = self.class.with(write: {w: 1}) do |query|
      query.
        where(id: id, state: :running, sub_state: :processing).
        update({"$set" => {state: "failed", worker_name: worker_name}})
    end
    fail_job = false unless result.modified_count.positive?
  end

  return unless fail_job

  message        = "#{input.failed.count} slices failed to process"
  self.exception = JobException.new(message: message)
  new_record? ? fail(worker_name, message) : fail!(worker_name, message)
end

#rocket_job_batch_perform(slice, record) ⇒ Object

Perform a single record within the current slice.



175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
# File 'lib/rocket_job/batch/worker.rb', line 175

def rocket_job_batch_perform(slice, record)
  @rocket_job_record_number = slice.current_record_number

  return block_given? ? yield(record) : perform(record) if _perform_callbacks.empty?

  # @rocket_job_input and @rocket_job_output can be modified by before/around callbacks
  @rocket_job_input  = record
  @rocket_job_output = nil

  run_callbacks(:perform) do
    @rocket_job_output =
      if block_given?
        yield(@rocket_job_input)
      else
        perform(@rocket_job_input)
      end
  end

  @rocket_job_input  = nil
  result             = @rocket_job_output
  @rocket_job_output = nil
  result
end

#rocket_job_batch_run_after_callbacks(save_before = true) ⇒ Object

Run the after_batch callbacks Saves the current state before and after running callbacks if callbacks present



288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
# File 'lib/rocket_job/batch/worker.rb', line 288

def rocket_job_batch_run_after_callbacks(save_before = true)
  unless _after_batch_callbacks.empty?
    self.sub_state = :after
    save! if save_before && !new_record? && !destroyed?
    logger.measure_info(
      "after_batch",
      metric:             "#{self.class.name}/after_batch",
      log_exception:      :full,
      on_exception_level: :error,
      silence:            log_level
    ) do
      run_callbacks(:after_batch)
    end
  end
  if new_record? || destroyed?
    complete if may_complete?
  else
    may_complete? ? complete! : save!
  end
end

#rocket_job_batch_run_before_callbacksObject

Run the before_batch callbacks Saves the current state before and after running callbacks if callbacks present



268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
# File 'lib/rocket_job/batch/worker.rb', line 268

def rocket_job_batch_run_before_callbacks
  unless _before_batch_callbacks.empty?
    self.sub_state = :before
    save! unless new_record? || destroyed?
    logger.measure_info(
      "before_batch",
      metric:             "#{self.class.name}/before_batch",
      log_exception:      :full,
      on_exception_level: :error,
      silence:            log_level
    ) do
      run_callbacks(:before_batch)
    end
  end
  self.sub_state = :processing
  save! unless new_record? || destroyed?
end

#rocket_job_batch_throttled?(slice, worker) ⇒ Boolean

Returns:

  • (Boolean)


113
114
115
116
117
118
119
120
121
# File 'lib/rocket_job/batch/worker.rb', line 113

def rocket_job_batch_throttled?(slice, worker)
  filter = self.class.rocket_job_batch_throttles.matching_filter(self, slice)
  return false unless filter

  # Restore retrieved slice so that other workers can process it later.
  slice.set(worker_name: nil, state: :queued, started_at: nil)
  worker.add_to_current_filter(filter)
  true
end

#rocket_job_perform_slice(slice, &block) ⇒ Object

Perform individual slice without callbacks



145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
# File 'lib/rocket_job/batch/worker.rb', line 145

def rocket_job_perform_slice(slice, &block)
  slice.processing_record_number ||= 0
  append                         = false

  # Skip processed records in this slice if it has no output categories.
  records =
    if slice.processing_record_number.to_i > 1
      append = true
      logger.info("Resuming previously incomplete slice from record number #{slice.processing_record_number}")
      slice.records[slice.processing_record_number - 1..-1]
    else
      # Reprocess all records in this slice.
      slice.processing_record_number = 0
      slice.records
    end

  count = 0
  RocketJob::Sliced::Writer::Output.collect(self, input_slice: slice, append: append) do |writer|
    records.each do |record|
      slice.processing_record_number += 1
      SemanticLogger.named_tagged(record: slice.current_record_number) do
        writer << rocket_job_batch_perform(slice, record, &block)
        count += 1
      end
    end
  end
  count
end

#rocket_job_process_slice(slice, &block) ⇒ Object

Process a single slice from Mongo Once the slice has been successfully processed it will be removed from the input collection Returns [Integer] the number of records successfully processed



126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
# File 'lib/rocket_job/batch/worker.rb', line 126

def rocket_job_process_slice(slice, &block)
  @rocket_job_slice = slice
  count             = 0

  run_callbacks(:slice) do
    # Allow before_slice callbacks to fail, complete or abort this slice.
    return 0 unless running?

    count = rocket_job_perform_slice(slice, &block)
  end
  @rocket_job_slice = nil

  # On successful completion remove the slice from the input queue
  # TODO: Add option to complete slice instead of destroying it to retain input data.
  slice.destroy
  count
end

#rocket_job_work(worker, re_raise_exceptions = false) ⇒ Object

Processes records in each available slice for this job. Slices are processed one at a time to allow for concurrent calls to this method to increase throughput. Processing will continue until there are no more slices available for this job.

Returns [true|false] whether any work was performed.

Slices are destroyed after their records are successfully processed

If an exception was thrown the entire slice of records is marked as failed.

Thread-safe, can be called by multiple threads at the same time



29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
# File 'lib/rocket_job/batch/worker.rb', line 29

def rocket_job_work(worker, re_raise_exceptions = false)
  raise "Job must be started before calling #rocket_job_work" unless running?

  start_time = Time.now
  if sub_state != :processing
    fail_on_exception!(re_raise_exceptions) { rocket_job_batch_callbacks(worker) }
    return false unless running?
  end

  SemanticLogger.named_tagged(job: id.to_s) do
    until worker.shutdown?
      slice = input.next_slice(worker.name)
      if slice
        # Grab a slice before checking the throttle to reduce concurrency race condition.
        return true if slice.fail_on_exception!(re_raise_exceptions) { rocket_job_batch_throttled?(slice, worker) }
        next if slice.failed?

        slice.fail_on_exception!(re_raise_exceptions) { rocket_job_process_slice(slice) }
      elsif record_count && fail_on_exception!(re_raise_exceptions) { rocket_job_batch_complete?(worker.name) }
        return false
      else
        logger.debug "No more work available for this job"
        worker.add_to_current_filter(throttle_filter_id)
        return true
      end

      # Allow new jobs with a higher priority to interrupt this job
      break if (Time.now - start_time) >= Config.re_check_seconds
    end
  end
  false
end

#work_first_slice(&block) ⇒ Object

Deprecated.

Please open a ticket if you need this behavior.

Prior to a job being made available for processing it can be processed one slice at a time.

For example, to extract the header row which would be in the first slice.

Returns [Integer] the number of records processed in the slice

Note: The slice will be removed from processing when this method completes



72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
# File 'lib/rocket_job/batch/worker.rb', line 72

def work_first_slice(&block)
  raise "#work_first_slice can only be called from within before_batch callbacks" unless sub_state == :before

  # TODO: Make these settings configurable
  count        = 0
  wait_seconds = 5
  while input.first.nil?
    break if count > 10

    logger.info "First slice has not arrived yet, sleeping for #{wait_seconds} seconds"
    sleep wait_seconds
    count += 1
  end

  slice = input.first
  # No records processed
  return 0 unless slice

  # TODO: Persist that the first slice is being processed by this worker
  slice.start
  rocket_job_process_slice(slice, &block)
end