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