CHANGELOG.md

   1 # Changelog
   2
   3 All notable changes to this project will be documented in this file.
   4
   5 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
   6 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
   7
   8 ## [Unreleased]
   9
  10 ### Fixed
  11
  12 - Don't account worker usage statistics for tasks that have failed.
  13
  14 ### Changed
  15
  16 - Update simple moving average implementation to use a circular buffer.
  17 - Update simple moving median implementation to use a circular buffer.
  18
  19 ## [2.6.34] - 2023-08-24
  20
  21 ### Fixes
  22
  23 - Avoid cascading tasks stealing under back pressure.
  24
  25 ### Changed
  26
  27 - Add fastpath to queued tasks rescheduling.
  28
  29 ## [2.6.33] - 2023-08-24
  30
  31 ### Fixed
  32
  33 - Fix queued tasks rescheduling.
  34
  35 ### Changed
  36
  37 - Rename tasks queue options `queueMaxSize` to `size`.
  38
  39 ### Added
  40
  41 - Task stealing scheduling algorithm if tasks queueing is enabled.
  42
  43 ## [2.6.32] - 2023-08-23
  44
  45 ### Fixed
  46
  47 - Ensure no task can be executed when the pool is destroyed.
  48
  49 ### Added
  50
  51 - Add `queueMaxSize` option to tasks queue options.
  52 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
  53 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
  54
  55 ## [2.6.31] - 2023-08-20
  56
  57 ### Fixed
  58
  59 - Fix worker choice strategy retries mechanism in some edge cases.
  60
  61 ### Changed
  62
  63 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
  64 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
  65
  66 ## [2.6.30] - 2023-08-19
  67
  68 ### Fixed
  69
  70 - Ensure pool event `backPressure` is emitted.
  71 - Ensure pool event `full` is emitted only once.
  72 - Ensure worker node cannot be instantiated without proper arguments.
  73
  74 ## [2.6.29] - 2023-08-18
  75
  76 ### Fixed
  77
  78 - Fix race condition between ready and task functions worker message handling at startup.
  79 - Fix duplicate task function worker usage statistics computation per task function.
  80 - Update task function worker usage statistics if and only if there's at least two different task functions.
  81 - Fix race condition at task function worker usage executing task computation leading to negative value.
  82
  83 ### Added
  84
  85 - Add back pressure detection on the worker node queue. Event `backPressure` is emitted when all worker node queues are full (worker node queue size >= poolMaxSize^2).
  86 - Use back pressure detection in worker choice strategies.
  87 - Add worker choice strategies retries mechanism if no worker is eligible.
  88
  89 ## [2.6.28] - 2023-08-16
  90
  91 ### Fixed
  92
  93 - Ensure pool workers are properly initialized.
  94
  95 ### Added
  96
  97 - HTTP server pool examples: express-cluster, express-hybrid.
  98
  99 ### Changed
 100
 101 - Remove now useless branching in worker hot code path.
 102
 103 ## [2.6.27] - 2023-08-15
 104
 105 ### Fixed
 106
 107 - Add `KillHandler` type definition to exported types.
 108
 109 ### Added
 110
 111 - Add `destroy` event to pool API.
 112
 113 ## [2.6.26] - 2023-08-15
 114
 115 ### Added
 116
 117 - Add kill handler to worker options allowing to execute custom code when worker is killed.
 118 - Add `listTaskFunctions()` method to pool API.
 119 - SMTP server pool example: nodemailer.
 120
 121 ## [2.6.25] - 2023-08-13
 122
 123 ### Added
 124
 125 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
 126 - WebSocket server pool examples: ws-cluster, ws-hybrid.
 127
 128 ## [2.6.24] - 2023-08-12
 129
 130 ### Added
 131
 132 - Add array of transferable objects to the `execute()` method arguments.
 133 - WebSocket server pool examples: ws-worker_threads.
 134
 135 ## [2.6.23] - 2023-08-11
 136
 137 ### Fixed
 138
 139 - Fix pool busyness semantic when tasks queueing is enabled: the pool is busy when the number of executing tasks on each worker has reached the maximum tasks concurrency per worker.
 140
 141 ### Added
 142
 143 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
 144 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
 145
 146 ## [2.6.22] - 2023-08-10
 147
 148 ### Fixed
 149
 150 - Add missing `types` field to package.json `exports`.
 151
 152 ### Changed
 153
 154 - Structure markdown documentation (PR #811).
 155
 156 ## [2.6.21] - 2023-08-03
 157
 158 ### Changed
 159
 160 - Improve code documentation.
 161 - Code refactoring and cleanup for better maintainability and readability.
 162
 163 ## [2.6.20] - 2023-07-21
 164
 165 ### Fixed
 166
 167 - Fix queued tasks redistribution on error task execution starvation.
 168 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
 169
 170 ### Changed
 171
 172 - Drastically reduce lookups by worker in the worker nodes.
 173
 174 ## [2.6.19] - 2023-07-20
 175
 176 ### Added
 177
 178 - Dedicated internal communication channel for worker_threads pools.
 179
 180 ## [2.6.18] - 2023-07-19
 181
 182 ### Changed
 183
 184 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
 185
 186 ## [2.6.17] - 2023-07-16
 187
 188 ### Added
 189
 190 - Add `listTaskFunctions()` method to worker API.
 191
 192 ## [2.6.16] - 2023-07-12
 193
 194 ### Fixed
 195
 196 - Fix pool startup detection.
 197 - Fix worker task functions handling.
 198
 199 ## [2.6.15] - 2023-07-11
 200
 201 ### Added
 202
 203 - Take into account worker node readiness in worker choice strategies.
 204
 205 ## [2.6.14] - 2023-07-10
 206
 207 ### Fixed
 208
 209 - Fix task function statistics tracking.
 210
 211 ## [2.6.13] - 2023-07-10
 212
 213 ### Added
 214
 215 - Add per task function statistics tracking.
 216 - Add public methods to manipulate the worker task functions at runtime.
 217
 218 ## [2.6.12] - 2023-07-09
 219
 220 ### Fixed
 221
 222 - Workaround import issue with `node:os` module in node 16.x.x.
 223
 224 ## [2.6.11] - 2023-07-09
 225
 226 ### Fixed
 227
 228 - Fix pool readiness semantic.
 229
 230 ## [2.6.10] - 2023-07-08
 231
 232 ### Fixed
 233
 234 - Ensure workers are not recreated on error at pool startup.
 235
 236 ### Added
 237
 238 - Add `ready` and `strategy` fields to pool information.
 239 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
 240 - Add dynamic pool sizing checks.
 241
 242 ## [2.6.9] - 2023-07-07
 243
 244 ### Fixed
 245
 246 - Recreate the right worker type on uncaught exception.
 247
 248 ### Added
 249
 250 - Add minimum and maximum to internal measurement statistics.
 251 - Add `runTime` and `waitTime` to pool information.
 252 - Check worker inactive time only on dynamic worker.
 253
 254 ## [2.6.8] - 2023-07-03
 255
 256 ### Fixed
 257
 258 - Brown paper bag release to fix version handling in pool information.
 259
 260 ## [2.6.7] - 2023-07-03
 261
 262 ### Fixed
 263
 264 - Ensure worker queued tasks at error are reassigned to other pool workers.
 265
 266 ### Added
 267
 268 - Add pool `utilization` ratio to pool information.
 269 - Add `version` to pool information.
 270 - Add worker information to worker nodes.
 271
 272 ## [2.6.6] - 2023-07-01
 273
 274 ### Added
 275
 276 - Add safe helper `availableParallelism()` to help sizing the pool.
 277
 278 ### Fixed
 279
 280 - Ensure message handler is only registered in worker.
 281
 282 ## [2.6.5] - 2023-06-27
 283
 284 ### Known issues
 285
 286 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
 287
 288 ### Fixed
 289
 290 - Artificial version bump to 2.6.5 to workaround publication issue.
 291 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
 292 - Ensure pool event is emitted before task error promise rejection.
 293 - Fix queued tasks count computation.
 294
 295 ### Removed
 296
 297 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
 298
 299 ## [2.6.4] - 2023-06-27
 300
 301 ### Known issues
 302
 303 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
 304
 305 ### Fixed
 306
 307 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
 308 - Ensure pool event is emitted before task error promise rejection.
 309 - Fix queued tasks count computation.
 310
 311 ### Removed
 312
 313 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
 314
 315 ## [2.6.3] - 2023-06-19
 316
 317 ### Fixed
 318
 319 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
 320 - Update strategies internals after statistics computation.
 321
 322 ### Changed
 323
 324 - Optimize O(1) queue implementation.
 325
 326 ## [2.6.2] - 2023-06-12
 327
 328 ### Fixed
 329
 330 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
 331
 332 ## [2.6.1] - 2023-06-10
 333
 334 ### Added
 335
 336 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
 337
 338 ### Fixed
 339
 340 - Fix average statistics computation: ensure failed tasks are not accounted.
 341
 342 ## [2.6.0] - 2023-06-09
 343
 344 ### Added
 345
 346 - Add `LEAST_ELU` worker choice strategy (experimental).
 347 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
 348
 349 ### Changed
 350
 351 - Refactor pool worker node usage internals.
 352 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
 353 - Breaking change: pool information `info` property object fields have been renamed.
 354
 355 ### Fixed
 356
 357 - Fix wait time accounting.
 358 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
 359 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
 360
 361 ## [2.5.4] - 2023-06-07
 362
 363 ### Added
 364
 365 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
 366
 367 ### Changed
 368
 369 - Compute statistics at the worker level only if needed.
 370 - Add `worker_threads` options to thread pool options.
 371
 372 ### Fixed
 373
 374 - Make the `LEAST_BUSY` strategy only relies on task runtime.
 375
 376 ## [2.5.3] - 2023-06-04
 377
 378 ### Changed
 379
 380 - Refine pool information content.
 381 - Limit pool internals public exposure.
 382
 383 ## [2.5.2] - 2023-06-02
 384
 385 ### Added
 386
 387 - Add `taskError` pool event for task execution error.
 388 - Add pool information `info` property to pool.
 389 - Emit pool information on `busy` and `full` pool events.
 390
 391 ## [2.5.1] - 2023-06-01
 392
 393 ### Added
 394
 395 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
 396 - Add `error` pool event for uncaught worker error.
 397
 398 ## [2.5.0] - 2023-05-31
 399
 400 ### Added
 401
 402 - Switch pool event emitter to `EventEmitterAsyncResource`.
 403 - Add tasks wait time accounting in per worker tasks usage.
 404 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
 405
 406 ### Changed
 407
 408 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
 409
 410 ## [2.4.14] - 2023-05-09
 411
 412 ### Fixed
 413
 414 - Ensure no undefined task runtime can land in the tasks history.
 415 - Fix median computation implementation once again.
 416
 417 ### Added
 418
 419 - Unit tests for median and queue implementations.
 420
 421 ## [2.4.13] - 2023-05-08
 422
 423 ### Fixed
 424
 425 - Fix worker choice strategy options validation.
 426 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
 427
 428 ## [2.4.12] - 2023-05-06
 429
 430 ### Added
 431
 432 - Support multiple task functions per worker.
 433 - Add custom worker weights support to worker choice strategies options.
 434
 435 ### Changed
 436
 437 - Use O(1) queue implementation for tasks queueing.
 438
 439 ### Fixed
 440
 441 - Fix median computation implementation.
 442 - Fix fair share worker choice strategy internals update.
 443
 444 ## [2.4.11] - 2023-04-23
 445
 446 ### Changed
 447
 448 - Optimize free worker finding in worker choice strategies.
 449
 450 ## [2.4.10] - 2023-04-15
 451
 452 ### Fixed
 453
 454 - Fix typescript type definition for task function: ensure the input data is optional.
 455 - Fix typescript type definition for pool execute(): ensure the input data is optional.
 456
 457 ## [2.4.9] - 2023-04-15
 458
 459 ### Added
 460
 461 - Add tasks queue enablement runtime setter to pool.
 462 - Add tasks queue options runtime setter to pool.
 463 - Add worker choice strategy options runtime setter to pool.
 464
 465 ### Changed
 466
 467 - Remove the tasks queuing experimental status.
 468
 469 ### Fixed
 470
 471 - Fix task function type definition and validation.
 472 - Fix worker choice strategy options handling.
 473
 474 ## [2.4.8] - 2023-04-12
 475
 476 ### Fixed
 477
 478 - Fix message between main worker and worker type definition for tasks.
 479 - Fix code documentation.
 480
 481 ## [2.4.7] - 2023-04-11
 482
 483 ### Added
 484
 485 - Add worker tasks queue options to pool options.
 486
 487 ### Fixed
 488
 489 - Fix missing documentation.
 490
 491 ## [2.4.6] - 2023-04-10
 492
 493 ### Fixed
 494
 495 - Ensure one task at a time is executed per worker with tasks queueing enabled.
 496 - Properly count worker executing tasks with tasks queueing enabled.
 497
 498 ## [2.4.5] - 2023-04-09
 499
 500 ### Added
 501
 502 - Use monotonic high resolution timer for worker tasks runtime.
 503 - Add worker tasks median runtime to statistics.
 504 - Add worker tasks queue (experimental).
 505
 506 ## [2.4.4] - 2023-04-07
 507
 508 ### Added
 509
 510 - Add `PoolEvents` enumeration and `PoolEvent` type.
 511
 512 ### Fixed
 513
 514 - Destroy worker only on alive check.
 515
 516 ## [2.4.3] - 2023-04-07
 517
 518 ### Fixed
 519
 520 - Fix typedoc generation with inheritance.
 521
 522 ## [2.4.2] - 2023-04-06
 523
 524 ### Added
 525
 526 - Add `full` event to dynamic pool.
 527 - Keep worker choice strategy in memory for conditional reuse.
 528
 529 ### Fixed
 530
 531 - Fix possible negative worker key at worker removal in worker choice strategies.
 532
 533 ## [2.4.1] - 2023-04-05
 534
 535 ### Changed
 536
 537 - Optimize worker choice strategy for dynamic pool.
 538
 539 ### Fixed
 540
 541 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
 542
 543 ## [2.4.0] - 2023-04-04
 544
 545 ### Added
 546
 547 - Add `LESS_BUSY` worker choice strategy.
 548
 549 ### Changed
 550
 551 - Optimize worker storage in pool.
 552 - Optimize worker alive status check.
 553 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 554 - Optimize `LESS_USED` worker choice strategy.
 555 - Update benchmarks versus external threads pools.
 556 - Optimize tasks usage statistics requirements for worker choice strategy.
 557
 558 ### Fixed
 559
 560 - Ensure trimmable characters are checked at pool initialization.
 561 - Fix message id integer overflow.
 562 - Fix pool worker removal in worker choice strategy internals.
 563 - Fix package publication with pnpm.
 564
 565 ## [2.4.0-3] - 2023-04-04
 566
 567 ### Added
 568
 569 - Add `LESS_BUSY` worker choice strategy.
 570
 571 ### Changed
 572
 573 - Optimize worker storage in pool.
 574 - Optimize worker alive status check.
 575 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 576 - Optimize `LESS_USED` worker choice strategy.
 577 - Update benchmarks versus external threads pools.
 578
 579 ### Fixed
 580
 581 - Ensure trimmable characters are checked at pool initialization.
 582 - Fix message id integer overflow.
 583 - Fix pool worker removal in worker choice strategy internals.
 584 - Fix package publication with pnpm.
 585
 586 ## [2.4.0-2] - 2023-04-03
 587
 588 ### Added
 589
 590 - Add `LESS_BUSY` worker choice strategy.
 591
 592 ### Changed
 593
 594 - Optimize worker storage in pool.
 595 - Optimize worker alive status check.
 596 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 597 - Optimize `LESS_USED` worker choice strategy.
 598
 599 ### Fixed
 600
 601 - Ensure trimmable characters are checked at pool initialization.
 602 - Fix message id integer overflow.
 603 - Fix pool worker removal in worker choice strategy internals.
 604 - Fix package publication with pnpm.
 605
 606 ## [2.4.0-1] - 2023-04-03
 607
 608 ### Added
 609
 610 - Add `LESS_BUSY` worker choice strategy.
 611
 612 ### Changed
 613
 614 - Optimize worker storage in pool.
 615 - Optimize worker alive status check.
 616 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 617 - Optimize `LESS_USED` worker choice strategy.
 618
 619 ### Fixed
 620
 621 - Ensure trimmable characters are checked at pool initialization.
 622 - Fix message id integer overflow.
 623 - Fix pool worker removal in worker choice strategy internals.
 624
 625 ## [2.4.0-0] - 2023-04-03
 626
 627 ### Added
 628
 629 - Add `LESS_BUSY` worker choice strategy.
 630
 631 ### Changed
 632
 633 - Optimize worker storage in pool.
 634 - Optimize worker alive status check.
 635 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 636 - Optimize `LESS_USED` worker choice strategy.
 637
 638 ### Fixed
 639
 640 - Ensure trimmable characters are checked at pool initialization.
 641 - Fix message id integer overflow.
 642 - Fix pool worker removal in worker choice strategy internals.
 643
 644 ## [2.3.10] - 2023-03-18
 645
 646 ### Fixed
 647
 648 - Fix package.json `exports` syntax for ESM and CommonJS.
 649
 650 ### Changed
 651
 652 - Permit SemVer pre-release publication.
 653
 654 ## [2.3.10-2] - 2023-03-18
 655
 656 ### Fixed
 657
 658 - Fix package.json `exports` syntax for ESM and CommonJS.
 659
 660 ## [2.3.10-1] - 2023-03-18
 661
 662 ### Changed
 663
 664 - Permit SemVer pre-release publication.
 665
 666 ## [2.3.10-0] - 2023-03-18
 667
 668 ### Fixed
 669
 670 - Fix package.json `exports` syntax for ESM and CommonJS.
 671
 672 ## [2.3.9] - 2023-03-18
 673
 674 ### Changed
 675
 676 - Introduce ESM module support along with CommonJS one.
 677
 678 ### Fixed
 679
 680 - Fix brown paper bag bug referencing the same object literal.
 681
 682 ## [2.3.8] - 2023-03-18
 683
 684 ### Changed
 685
 686 - Switch internal benchmarking code to benny.
 687 - Switch to TypeScript 5.x.x.
 688 - Switch rollup bundler plugins to core ones.
 689 - Switch to TSDoc syntax.
 690 - Enforce conventional commits.
 691
 692 ### Fixed
 693
 694 - Fix random integer generator.
 695 - Fix worker choice strategy pool type identification at initialization.
 696
 697 ## [2.3.7] - 2022-10-23
 698
 699 ### Changed
 700
 701 - Switch to open collective FOSS project funding platform.
 702 - Switch to ts-standard linter configuration on TypeScript code.
 703
 704 ### Fixed
 705
 706 - Fixed missing async on pool execute method.
 707 - Fixed typing in TypeScript example.
 708 - Fixed types in unit tests.
 709
 710 ## [2.3.6] - 2022-10-22
 711
 712 ### Changed
 713
 714 - Cleanup pool attributes and methods.
 715 - Refine error types thrown.
 716
 717 ### Fixed
 718
 719 - Fix continuous integration build on windows.
 720 - Fix code coverage reporting by using c8 instead of nyc.
 721
 722 ## [2.3.5] - 2022-10-21
 723
 724 ### Changed
 725
 726 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
 727 - Optimize tasks usage lookup implementation.
 728
 729 ### Fixed
 730
 731 - Fix missed pool event emitter type export.
 732 - Fix typedoc documentation generation.
 733
 734 ## [2.3.4] - 2022-10-17
 735
 736 ### Added
 737
 738 - Fully automate release process with release-it.
 739
 740 ### Changed
 741
 742 - Optimize fair share task scheduling algorithm implementation.
 743 - Update benchmarks versus external pools results with latest version.
 744
 745 ## [2.3.3] - 2022-10-15
 746
 747 ### Added
 748
 749 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
 750
 751 ## [2.3.2] - 2022-10-14
 752
 753 ### Changed
 754
 755 - Optimize fair share worker selection strategy implementation.
 756
 757 ### Fixed
 758
 759 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
 760
 761 ## [2.3.1] - 2022-10-13
 762
 763 ### Added
 764
 765 - Pool worker choice strategies:
 766   - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
 767   - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
 768
 769 ## [2.2.2] - 2022-10-09
 770
 771 ### Fixed
 772
 773 - Fixed `README.md` file.
 774
 775 ## [2.2.1] - 2022-10-08
 776
 777 ### Added
 778
 779 - Dynamic worker choice strategy change at runtime.
 780
 781 ## [2.2.0] - 2022-01-05
 782
 783 ### Breaking Changes
 784
 785 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
 786
 787 ## [2.1.0] - 2021-08-29
 788
 789 ### Added
 790
 791 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
 792
 793 ### Breaking Changes
 794
 795 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
 796 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
 797 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
 798 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
 799
 800 ## [2.0.2] - 2021-05-12
 801
 802 ### Bug fixes
 803
 804 - Fix `busy` event emission on fixed pool type
 805
 806 ## [2.0.1] - 2021-03-16
 807
 808 ### Bug fixes
 809
 810 - Check if pool options are properly set.
 811 - `busy` event is emitted on all pool types.
 812
 813 ## [2.0.0] - 2021-03-01
 814
 815 ### Bug fixes
 816
 817 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
 818
 819 ### Breaking Changes
 820
 821 - `FullPool` event is now renamed to `busy`.
 822 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
 823   _Find more details on our JSDoc._
 824
 825 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
 826
 827 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
 828
 829 ### Pool options types declaration merge
 830
 831 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
 832
 833 #### New `export` strategy
 834
 835 ```js
 836 // Before
 837 const DynamicThreadPool = require('poolifier/lib/dynamic')
 838 // After
 839 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
 840 ```
 841
 842 But you should always prefer just using
 843
 844 ```js
 845 const { DynamicThreadPool } = require('poolifier')
 846 ```
 847
 848 #### New type definitions for input data and response
 849
 850 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
 851 _This is not a limitation by poolifier but Node.js._
 852
 853 #### Public property replacements
 854
 855 `numWorkers` property is now `numberOfWorkers`
 856
 857 #### Internal (protected) properties and methods renaming
 858
 859 These properties are not intended for end users
 860
 861 - `id` => `nextMessageId`
 862
 863 These methods are not intended for end users
 864
 865 - `_chooseWorker` => `chooseWorker`
 866 - `_newWorker` => `createWorker`
 867 - `_execute` => `internalExecute`
 868 - `_chooseWorker` => `chooseWorker`
 869 - `_checkAlive` => `checkAlive`
 870 - `_run` => `run`
 871 - `_runAsync` => `runAsync`
 872
 873 ## [1.1.0] - 2020-05-21
 874
 875 ### Added
 876
 877 - ThreadWorker support async functions as option
 878 - Various external library patches
 879
 880 ## [1.0.0] - 2020-01-24
 881
 882 ### Added
 883
 884 - FixedThreadPool implementation
 885 - DynamicThreadPool implementation
 886 - WorkerThread implementation to improve developer experience