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