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 ## [2.6.35] - 2023-08-25
  11
  12 ### Fixed
  13
  14 - Don't account worker usage statistics for tasks that have failed.
  15 - Fix pool information runtime and wait time median computation.
  16
  17 ### Changed
  18
  19 - Update simple moving average implementation to use a circular buffer.
  20 - Update simple moving median implementation to use a circular buffer.
  21 - Account for stolen tasks in worker usage statistics and pool information.
  22
  23 ### Added
  24
  25 - Continuous tasks stealing algorithm.
  26
  27 ## [2.6.34] - 2023-08-24
  28
  29 ### Fixes
  30
  31 - Avoid cascading tasks stealing under back pressure.
  32
  33 ### Changed
  34
  35 - Add fastpath to queued tasks rescheduling.
  36
  37 ## [2.6.33] - 2023-08-24
  38
  39 ### Fixed
  40
  41 - Fix queued tasks rescheduling.
  42
  43 ### Changed
  44
  45 - Rename tasks queue options `queueMaxSize` to `size`.
  46
  47 ### Added
  48
  49 - Task stealing scheduling algorithm if tasks queueing is enabled.
  50
  51 ## [2.6.32] - 2023-08-23
  52
  53 ### Fixed
  54
  55 - Ensure no task can be executed when the pool is destroyed.
  56
  57 ### Added
  58
  59 - Add `queueMaxSize` option to tasks queue options.
  60 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
  61 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
  62
  63 ## [2.6.31] - 2023-08-20
  64
  65 ### Fixed
  66
  67 - Fix worker choice strategy retries mechanism in some edge cases.
  68
  69 ### Changed
  70
  71 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
  72 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
  73
  74 ## [2.6.30] - 2023-08-19
  75
  76 ### Fixed
  77
  78 - Ensure pool event `backPressure` is emitted.
  79 - Ensure pool event `full` is emitted only once.
  80 - Ensure worker node cannot be instantiated without proper arguments.
  81
  82 ## [2.6.29] - 2023-08-18
  83
  84 ### Fixed
  85
  86 - Fix race condition between ready and task functions worker message handling at startup.
  87 - Fix duplicate task function worker usage statistics computation per task function.
  88 - Update task function worker usage statistics if and only if there's at least two different task functions.
  89 - Fix race condition at task function worker usage executing task computation leading to negative value.
  90
  91 ### Added
  92
  93 - 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).
  94 - Use back pressure detection in worker choice strategies.
  95 - Add worker choice strategies retries mechanism if no worker is eligible.
  96
  97 ## [2.6.28] - 2023-08-16
  98
  99 ### Fixed
 100
 101 - Ensure pool workers are properly initialized.
 102
 103 ### Added
 104
 105 - HTTP server pool examples: express-cluster, express-hybrid.
 106
 107 ### Changed
 108
 109 - Remove now useless branching in worker hot code path.
 110
 111 ## [2.6.27] - 2023-08-15
 112
 113 ### Fixed
 114
 115 - Add `KillHandler` type definition to exported types.
 116
 117 ### Added
 118
 119 - Add `destroy` event to pool API.
 120
 121 ## [2.6.26] - 2023-08-15
 122
 123 ### Added
 124
 125 - Add kill handler to worker options allowing to execute custom code when worker is killed.
 126 - Add `listTaskFunctions()` method to pool API.
 127 - SMTP server pool example: nodemailer.
 128
 129 ## [2.6.25] - 2023-08-13
 130
 131 ### Added
 132
 133 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
 134 - WebSocket server pool examples: ws-cluster, ws-hybrid.
 135
 136 ## [2.6.24] - 2023-08-12
 137
 138 ### Added
 139
 140 - Add array of transferable objects to the `execute()` method arguments.
 141 - WebSocket server pool examples: ws-worker_threads.
 142
 143 ## [2.6.23] - 2023-08-11
 144
 145 ### Fixed
 146
 147 - 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.
 148
 149 ### Added
 150
 151 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
 152 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
 153
 154 ## [2.6.22] - 2023-08-10
 155
 156 ### Fixed
 157
 158 - Add missing `types` field to package.json `exports`.
 159
 160 ### Changed
 161
 162 - Structure markdown documentation (PR #811).
 163
 164 ## [2.6.21] - 2023-08-03
 165
 166 ### Changed
 167
 168 - Improve code documentation.
 169 - Code refactoring and cleanup for better maintainability and readability.
 170
 171 ## [2.6.20] - 2023-07-21
 172
 173 ### Fixed
 174
 175 - Fix queued tasks redistribution on error task execution starvation.
 176 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
 177
 178 ### Changed
 179
 180 - Drastically reduce lookups by worker in the worker nodes.
 181
 182 ## [2.6.19] - 2023-07-20
 183
 184 ### Added
 185
 186 - Dedicated internal communication channel for worker_threads pools.
 187
 188 ## [2.6.18] - 2023-07-19
 189
 190 ### Changed
 191
 192 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
 193
 194 ## [2.6.17] - 2023-07-16
 195
 196 ### Added
 197
 198 - Add `listTaskFunctions()` method to worker API.
 199
 200 ## [2.6.16] - 2023-07-12
 201
 202 ### Fixed
 203
 204 - Fix pool startup detection.
 205 - Fix worker task functions handling.
 206
 207 ## [2.6.15] - 2023-07-11
 208
 209 ### Added
 210
 211 - Take into account worker node readiness in worker choice strategies.
 212
 213 ## [2.6.14] - 2023-07-10
 214
 215 ### Fixed
 216
 217 - Fix task function statistics tracking.
 218
 219 ## [2.6.13] - 2023-07-10
 220
 221 ### Added
 222
 223 - Add per task function statistics tracking.
 224 - Add public methods to manipulate the worker task functions at runtime.
 225
 226 ## [2.6.12] - 2023-07-09
 227
 228 ### Fixed
 229
 230 - Workaround import issue with `node:os` module in node 16.x.x.
 231
 232 ## [2.6.11] - 2023-07-09
 233
 234 ### Fixed
 235
 236 - Fix pool readiness semantic.
 237
 238 ## [2.6.10] - 2023-07-08
 239
 240 ### Fixed
 241
 242 - Ensure workers are not recreated on error at pool startup.
 243
 244 ### Added
 245
 246 - Add `ready` and `strategy` fields to pool information.
 247 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
 248 - Add dynamic pool sizing checks.
 249
 250 ## [2.6.9] - 2023-07-07
 251
 252 ### Fixed
 253
 254 - Recreate the right worker type on uncaught exception.
 255
 256 ### Added
 257
 258 - Add minimum and maximum to internal measurement statistics.
 259 - Add `runTime` and `waitTime` to pool information.
 260 - Check worker inactive time only on dynamic worker.
 261
 262 ## [2.6.8] - 2023-07-03
 263
 264 ### Fixed
 265
 266 - Brown paper bag release to fix version handling in pool information.
 267
 268 ## [2.6.7] - 2023-07-03
 269
 270 ### Fixed
 271
 272 - Ensure worker queued tasks at error are reassigned to other pool workers.
 273
 274 ### Added
 275
 276 - Add pool `utilization` ratio to pool information.
 277 - Add `version` to pool information.
 278 - Add worker information to worker nodes.
 279
 280 ## [2.6.6] - 2023-07-01
 281
 282 ### Added
 283
 284 - Add safe helper `availableParallelism()` to help sizing the pool.
 285
 286 ### Fixed
 287
 288 - Ensure message handler is only registered in worker.
 289
 290 ## [2.6.5] - 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 - Artificial version bump to 2.6.5 to workaround publication issue.
 299 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
 300 - Ensure pool event is emitted before task error promise rejection.
 301 - Fix queued tasks count computation.
 302
 303 ### Removed
 304
 305 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
 306
 307 ## [2.6.4] - 2023-06-27
 308
 309 ### Known issues
 310
 311 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
 312
 313 ### Fixed
 314
 315 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
 316 - Ensure pool event is emitted before task error promise rejection.
 317 - Fix queued tasks count computation.
 318
 319 ### Removed
 320
 321 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
 322
 323 ## [2.6.3] - 2023-06-19
 324
 325 ### Fixed
 326
 327 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
 328 - Update strategies internals after statistics computation.
 329
 330 ### Changed
 331
 332 - Optimize O(1) queue implementation.
 333
 334 ## [2.6.2] - 2023-06-12
 335
 336 ### Fixed
 337
 338 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
 339
 340 ## [2.6.1] - 2023-06-10
 341
 342 ### Added
 343
 344 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
 345
 346 ### Fixed
 347
 348 - Fix average statistics computation: ensure failed tasks are not accounted.
 349
 350 ## [2.6.0] - 2023-06-09
 351
 352 ### Added
 353
 354 - Add `LEAST_ELU` worker choice strategy (experimental).
 355 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
 356
 357 ### Changed
 358
 359 - Refactor pool worker node usage internals.
 360 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
 361 - Breaking change: pool information `info` property object fields have been renamed.
 362
 363 ### Fixed
 364
 365 - Fix wait time accounting.
 366 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
 367 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
 368
 369 ## [2.5.4] - 2023-06-07
 370
 371 ### Added
 372
 373 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
 374
 375 ### Changed
 376
 377 - Compute statistics at the worker level only if needed.
 378 - Add `worker_threads` options to thread pool options.
 379
 380 ### Fixed
 381
 382 - Make the `LEAST_BUSY` strategy only relies on task runtime.
 383
 384 ## [2.5.3] - 2023-06-04
 385
 386 ### Changed
 387
 388 - Refine pool information content.
 389 - Limit pool internals public exposure.
 390
 391 ## [2.5.2] - 2023-06-02
 392
 393 ### Added
 394
 395 - Add `taskError` pool event for task execution error.
 396 - Add pool information `info` property to pool.
 397 - Emit pool information on `busy` and `full` pool events.
 398
 399 ## [2.5.1] - 2023-06-01
 400
 401 ### Added
 402
 403 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
 404 - Add `error` pool event for uncaught worker error.
 405
 406 ## [2.5.0] - 2023-05-31
 407
 408 ### Added
 409
 410 - Switch pool event emitter to `EventEmitterAsyncResource`.
 411 - Add tasks wait time accounting in per worker tasks usage.
 412 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
 413
 414 ### Changed
 415
 416 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
 417
 418 ## [2.4.14] - 2023-05-09
 419
 420 ### Fixed
 421
 422 - Ensure no undefined task runtime can land in the tasks history.
 423 - Fix median computation implementation once again.
 424
 425 ### Added
 426
 427 - Unit tests for median and queue implementations.
 428
 429 ## [2.4.13] - 2023-05-08
 430
 431 ### Fixed
 432
 433 - Fix worker choice strategy options validation.
 434 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
 435
 436 ## [2.4.12] - 2023-05-06
 437
 438 ### Added
 439
 440 - Support multiple task functions per worker.
 441 - Add custom worker weights support to worker choice strategies options.
 442
 443 ### Changed
 444
 445 - Use O(1) queue implementation for tasks queueing.
 446
 447 ### Fixed
 448
 449 - Fix median computation implementation.
 450 - Fix fair share worker choice strategy internals update.
 451
 452 ## [2.4.11] - 2023-04-23
 453
 454 ### Changed
 455
 456 - Optimize free worker finding in worker choice strategies.
 457
 458 ## [2.4.10] - 2023-04-15
 459
 460 ### Fixed
 461
 462 - Fix typescript type definition for task function: ensure the input data is optional.
 463 - Fix typescript type definition for pool execute(): ensure the input data is optional.
 464
 465 ## [2.4.9] - 2023-04-15
 466
 467 ### Added
 468
 469 - Add tasks queue enablement runtime setter to pool.
 470 - Add tasks queue options runtime setter to pool.
 471 - Add worker choice strategy options runtime setter to pool.
 472
 473 ### Changed
 474
 475 - Remove the tasks queuing experimental status.
 476
 477 ### Fixed
 478
 479 - Fix task function type definition and validation.
 480 - Fix worker choice strategy options handling.
 481
 482 ## [2.4.8] - 2023-04-12
 483
 484 ### Fixed
 485
 486 - Fix message between main worker and worker type definition for tasks.
 487 - Fix code documentation.
 488
 489 ## [2.4.7] - 2023-04-11
 490
 491 ### Added
 492
 493 - Add worker tasks queue options to pool options.
 494
 495 ### Fixed
 496
 497 - Fix missing documentation.
 498
 499 ## [2.4.6] - 2023-04-10
 500
 501 ### Fixed
 502
 503 - Ensure one task at a time is executed per worker with tasks queueing enabled.
 504 - Properly count worker executing tasks with tasks queueing enabled.
 505
 506 ## [2.4.5] - 2023-04-09
 507
 508 ### Added
 509
 510 - Use monotonic high resolution timer for worker tasks runtime.
 511 - Add worker tasks median runtime to statistics.
 512 - Add worker tasks queue (experimental).
 513
 514 ## [2.4.4] - 2023-04-07
 515
 516 ### Added
 517
 518 - Add `PoolEvents` enumeration and `PoolEvent` type.
 519
 520 ### Fixed
 521
 522 - Destroy worker only on alive check.
 523
 524 ## [2.4.3] - 2023-04-07
 525
 526 ### Fixed
 527
 528 - Fix typedoc generation with inheritance.
 529
 530 ## [2.4.2] - 2023-04-06
 531
 532 ### Added
 533
 534 - Add `full` event to dynamic pool.
 535 - Keep worker choice strategy in memory for conditional reuse.
 536
 537 ### Fixed
 538
 539 - Fix possible negative worker key at worker removal in worker choice strategies.
 540
 541 ## [2.4.1] - 2023-04-05
 542
 543 ### Changed
 544
 545 - Optimize worker choice strategy for dynamic pool.
 546
 547 ### Fixed
 548
 549 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
 550
 551 ## [2.4.0] - 2023-04-04
 552
 553 ### Added
 554
 555 - Add `LESS_BUSY` worker choice strategy.
 556
 557 ### Changed
 558
 559 - Optimize worker storage in pool.
 560 - Optimize worker alive status check.
 561 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 562 - Optimize `LESS_USED` worker choice strategy.
 563 - Update benchmarks versus external threads pools.
 564 - Optimize tasks usage statistics requirements for worker choice strategy.
 565
 566 ### Fixed
 567
 568 - Ensure trimmable characters are checked at pool initialization.
 569 - Fix message id integer overflow.
 570 - Fix pool worker removal in worker choice strategy internals.
 571 - Fix package publication with pnpm.
 572
 573 ## [2.4.0-3] - 2023-04-04
 574
 575 ### Added
 576
 577 - Add `LESS_BUSY` worker choice strategy.
 578
 579 ### Changed
 580
 581 - Optimize worker storage in pool.
 582 - Optimize worker alive status check.
 583 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 584 - Optimize `LESS_USED` worker choice strategy.
 585 - Update benchmarks versus external threads pools.
 586
 587 ### Fixed
 588
 589 - Ensure trimmable characters are checked at pool initialization.
 590 - Fix message id integer overflow.
 591 - Fix pool worker removal in worker choice strategy internals.
 592 - Fix package publication with pnpm.
 593
 594 ## [2.4.0-2] - 2023-04-03
 595
 596 ### Added
 597
 598 - Add `LESS_BUSY` worker choice strategy.
 599
 600 ### Changed
 601
 602 - Optimize worker storage in pool.
 603 - Optimize worker alive status check.
 604 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 605 - Optimize `LESS_USED` worker choice strategy.
 606
 607 ### Fixed
 608
 609 - Ensure trimmable characters are checked at pool initialization.
 610 - Fix message id integer overflow.
 611 - Fix pool worker removal in worker choice strategy internals.
 612 - Fix package publication with pnpm.
 613
 614 ## [2.4.0-1] - 2023-04-03
 615
 616 ### Added
 617
 618 - Add `LESS_BUSY` worker choice strategy.
 619
 620 ### Changed
 621
 622 - Optimize worker storage in pool.
 623 - Optimize worker alive status check.
 624 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 625 - Optimize `LESS_USED` worker choice strategy.
 626
 627 ### Fixed
 628
 629 - Ensure trimmable characters are checked at pool initialization.
 630 - Fix message id integer overflow.
 631 - Fix pool worker removal in worker choice strategy internals.
 632
 633 ## [2.4.0-0] - 2023-04-03
 634
 635 ### Added
 636
 637 - Add `LESS_BUSY` worker choice strategy.
 638
 639 ### Changed
 640
 641 - Optimize worker storage in pool.
 642 - Optimize worker alive status check.
 643 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 644 - Optimize `LESS_USED` worker choice strategy.
 645
 646 ### Fixed
 647
 648 - Ensure trimmable characters are checked at pool initialization.
 649 - Fix message id integer overflow.
 650 - Fix pool worker removal in worker choice strategy internals.
 651
 652 ## [2.3.10] - 2023-03-18
 653
 654 ### Fixed
 655
 656 - Fix package.json `exports` syntax for ESM and CommonJS.
 657
 658 ### Changed
 659
 660 - Permit SemVer pre-release publication.
 661
 662 ## [2.3.10-2] - 2023-03-18
 663
 664 ### Fixed
 665
 666 - Fix package.json `exports` syntax for ESM and CommonJS.
 667
 668 ## [2.3.10-1] - 2023-03-18
 669
 670 ### Changed
 671
 672 - Permit SemVer pre-release publication.
 673
 674 ## [2.3.10-0] - 2023-03-18
 675
 676 ### Fixed
 677
 678 - Fix package.json `exports` syntax for ESM and CommonJS.
 679
 680 ## [2.3.9] - 2023-03-18
 681
 682 ### Changed
 683
 684 - Introduce ESM module support along with CommonJS one.
 685
 686 ### Fixed
 687
 688 - Fix brown paper bag bug referencing the same object literal.
 689
 690 ## [2.3.8] - 2023-03-18
 691
 692 ### Changed
 693
 694 - Switch internal benchmarking code to benny.
 695 - Switch to TypeScript 5.x.x.
 696 - Switch rollup bundler plugins to core ones.
 697 - Switch to TSDoc syntax.
 698 - Enforce conventional commits.
 699
 700 ### Fixed
 701
 702 - Fix random integer generator.
 703 - Fix worker choice strategy pool type identification at initialization.
 704
 705 ## [2.3.7] - 2022-10-23
 706
 707 ### Changed
 708
 709 - Switch to open collective FOSS project funding platform.
 710 - Switch to ts-standard linter configuration on TypeScript code.
 711
 712 ### Fixed
 713
 714 - Fixed missing async on pool execute method.
 715 - Fixed typing in TypeScript example.
 716 - Fixed types in unit tests.
 717
 718 ## [2.3.6] - 2022-10-22
 719
 720 ### Changed
 721
 722 - Cleanup pool attributes and methods.
 723 - Refine error types thrown.
 724
 725 ### Fixed
 726
 727 - Fix continuous integration build on windows.
 728 - Fix code coverage reporting by using c8 instead of nyc.
 729
 730 ## [2.3.5] - 2022-10-21
 731
 732 ### Changed
 733
 734 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
 735 - Optimize tasks usage lookup implementation.
 736
 737 ### Fixed
 738
 739 - Fix missed pool event emitter type export.
 740 - Fix typedoc documentation generation.
 741
 742 ## [2.3.4] - 2022-10-17
 743
 744 ### Added
 745
 746 - Fully automate release process with release-it.
 747
 748 ### Changed
 749
 750 - Optimize fair share task scheduling algorithm implementation.
 751 - Update benchmarks versus external pools results with latest version.
 752
 753 ## [2.3.3] - 2022-10-15
 754
 755 ### Added
 756
 757 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
 758
 759 ## [2.3.2] - 2022-10-14
 760
 761 ### Changed
 762
 763 - Optimize fair share worker selection strategy implementation.
 764
 765 ### Fixed
 766
 767 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
 768
 769 ## [2.3.1] - 2022-10-13
 770
 771 ### Added
 772
 773 - Pool worker choice strategies:
 774   - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
 775   - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
 776
 777 ## [2.2.2] - 2022-10-09
 778
 779 ### Fixed
 780
 781 - Fixed `README.md` file.
 782
 783 ## [2.2.1] - 2022-10-08
 784
 785 ### Added
 786
 787 - Dynamic worker choice strategy change at runtime.
 788
 789 ## [2.2.0] - 2022-01-05
 790
 791 ### Breaking Changes
 792
 793 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
 794
 795 ## [2.1.0] - 2021-08-29
 796
 797 ### Added
 798
 799 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
 800
 801 ### Breaking Changes
 802
 803 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
 804 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
 805 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
 806 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
 807
 808 ## [2.0.2] - 2021-05-12
 809
 810 ### Bug fixes
 811
 812 - Fix `busy` event emission on fixed pool type
 813
 814 ## [2.0.1] - 2021-03-16
 815
 816 ### Bug fixes
 817
 818 - Check if pool options are properly set.
 819 - `busy` event is emitted on all pool types.
 820
 821 ## [2.0.0] - 2021-03-01
 822
 823 ### Bug fixes
 824
 825 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
 826
 827 ### Breaking Changes
 828
 829 - `FullPool` event is now renamed to `busy`.
 830 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
 831   _Find more details on our JSDoc._
 832
 833 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
 834
 835 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
 836
 837 ### Pool options types declaration merge
 838
 839 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
 840
 841 #### New `export` strategy
 842
 843 ```js
 844 // Before
 845 const DynamicThreadPool = require('poolifier/lib/dynamic')
 846 // After
 847 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
 848 ```
 849
 850 But you should always prefer just using
 851
 852 ```js
 853 const { DynamicThreadPool } = require('poolifier')
 854 ```
 855
 856 #### New type definitions for input data and response
 857
 858 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
 859 _This is not a limitation by poolifier but Node.js._
 860
 861 #### Public property replacements
 862
 863 `numWorkers` property is now `numberOfWorkers`
 864
 865 #### Internal (protected) properties and methods renaming
 866
 867 These properties are not intended for end users
 868
 869 - `id` => `nextMessageId`
 870
 871 These methods are not intended for end users
 872
 873 - `_chooseWorker` => `chooseWorker`
 874 - `_newWorker` => `createWorker`
 875 - `_execute` => `internalExecute`
 876 - `_chooseWorker` => `chooseWorker`
 877 - `_checkAlive` => `checkAlive`
 878 - `_run` => `run`
 879 - `_runAsync` => `runAsync`
 880
 881 ## [1.1.0] - 2020-05-21
 882
 883 ### Added
 884
 885 - ThreadWorker support async functions as option
 886 - Various external library patches
 887
 888 ## [1.0.0] - 2020-01-24
 889
 890 ### Added
 891
 892 - FixedThreadPool implementation
 893 - DynamicThreadPool implementation
 894 - WorkerThread implementation to improve developer experience