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 - Fix possible null exception at task finishing handling.
  13
  14 ### Changed
  15
  16 - Optimize Deque implementation to improve tasks queueing performance.
  17
  18 ## [3.1.18] - 2024-01-06
  19
  20 ### Fixed
  21
  22 - Fix dynamic pool with minimum number of workers set to zero: [#1748](https://github.com/poolifier/poolifier/issues/1748).
  23
  24 ## [3.1.17] - 2024-01-05
  25
  26 ### Changed
  27
  28 - Improve performance by clean up unneeded condition checks on hot code paths.
  29
  30 ## [3.1.16] - 2024-01-03
  31
  32 ### Fixed
  33
  34 - Add missing type to TS type definitions.
  35
  36 ## [3.1.15] - 2024-01-02
  37
  38 ### Fixed
  39
  40 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
  41
  42 ## [3.1.15-0] - 2024-01-02
  43
  44 ### Fixed
  45
  46 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
  47
  48 ## [3.1.14] - 2024-01-01
  49
  50 ### Fixed
  51
  52 - Properly handle dynamic pool with zero minimum size.
  53
  54 ## [3.1.13] - 2023-12-30
  55
  56 ### Changed
  57
  58 - Reduce branching in several hot code paths.
  59 - Use faster object cloning implementation.
  60
  61 ## [3.1.12] - 2023-12-27
  62
  63 ### Fixed
  64
  65 - Fix tasks redistribution triggers at pool destroying.
  66
  67 ### Changed
  68
  69 - Switch TypeScript module resolution to Node16.
  70
  71 ## [3.1.12-0] - 2023-12-27
  72
  73 ### Fixed
  74
  75 - Fix tasks redistribution triggers at pool destroying.
  76
  77 ## [3.1.11] - 2023-12-24
  78
  79 ### Fixed
  80
  81 - Avoid worker node cross tasks stealing.
  82 - Ensure only half the pool worker nodes can steal tasks.
  83
  84 ## [3.1.10] - 2023-12-23
  85
  86 ### Changed
  87
  88 - Avoid useless branching on pool type.
  89
  90 ## [3.1.9] - 2023-12-22
  91
  92 ### Changed
  93
  94 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
  95
  96 ## [3.1.8] - 2023-12-21
  97
  98 ### Fixed
  99
 100 - Fix default worker weight computation.
 101 - Fix possible null exception at pool destroying.
 102
 103 ## [3.1.7] - 2023-12-20
 104
 105 ### Fixed
 106
 107 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
 108
 109 ## [3.1.6] - 2023-12-18
 110
 111 ### Fixed
 112
 113 - Fix pool destroying with tasks queuing enabled.
 114
 115 ## [3.1.5] - 2023-12-18
 116
 117 ### Added
 118
 119 - Add queued tasks end timeout support to worker node termination.
 120
 121 ## [3.1.4] - 2023-12-18
 122
 123 ### Fixed
 124
 125 - Make more robust the fix for possible null exception at handling task execution response.
 126
 127 ## [3.1.3] - 2023-12-17
 128
 129 ### Fixed
 130
 131 - Fix possible null exception at handling task execution response.
 132
 133 ## [3.1.2] - 2023-12-17
 134
 135 ### Fixed
 136
 137 - Wait for queued tasks to end at worker node termination.
 138
 139 ## [3.1.1] - 2023-12-16
 140
 141 ### Fixed
 142
 143 - Fix pool options TS type definition.
 144
 145 ## [3.1.0] - 2023-12-16
 146
 147 ### Changed
 148
 149 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
 150
 151 ## [3.0.14] - 2023-12-13
 152
 153 ### Fixed
 154
 155 - Fix possible null exception with worker_threads pools.
 156
 157 ## [3.0.13] - 2023-12-12
 158
 159 ### Fixed
 160
 161 - Ensure worker choice strategy wait for worker nodes readiness.
 162
 163 ### Changed
 164
 165 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
 166
 167 ## [3.0.12] - 2023-12-12
 168
 169 ### Changed
 170
 171 - Add infinite retries support in worker choice strategy.
 172
 173 ## [3.0.11] - 2023-12-11
 174
 175 ### Fixed
 176
 177 - Ensure pool asynchronous resource properly track tasks execution.
 178
 179 ## [3.0.10] - 2023-12-08
 180
 181 ### Changed
 182
 183 - Add a fastpath when tasks stealing or redistribution is impossible.
 184
 185 ## [3.0.9] - 2023-11-26
 186
 187 ### Fixed
 188
 189 - Remove all pool events listener at pool destroying.
 190 - Remove all worker node events listener at worker node destroying.
 191 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
 192
 193 ## [3.0.8] - 2023-11-25
 194
 195 ### Fixed
 196
 197 - Ensure continuous tasks stealing on idle start at worker node idling.
 198
 199 ## [3.0.7] - 2023-11-24
 200
 201 ### Changed
 202
 203 - Make continuous tasks stealing start at worker node idling.
 204
 205 ## [3.0.6] - 2023-11-24
 206
 207 ### Fixed
 208
 209 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
 210 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
 211
 212 ## [3.0.5] - 2023-10-27
 213
 214 ### Fixed
 215
 216 - Ensure pool `ready` event can be emitted only once.
 217
 218 ## [3.0.4] - 2023-10-20
 219
 220 ### Changed
 221
 222 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
 223 - Use builtin retry mechanism in worker choice strategies instead of custom one.
 224
 225 ## [3.0.3] - 2023-10-19
 226
 227 ### Fixed
 228
 229 - Avoid null exception at sending message to worker.
 230 - Avoid null exception at checking worker node readiness.
 231
 232 ## [3.0.2] - 2023-10-17
 233
 234 ### Fixed
 235
 236 - Fix race condition at dynamic worker node task assignment and scheduled removal. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468) and [#1496](https://github.com/poolifier/poolifier/issues/1496).
 237
 238 ## [3.0.1] - 2023-10-16
 239
 240 ### Fixed
 241
 242 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
 243
 244 ### Changed
 245
 246 - Switch the worker node eventing code to `EventTarget` API.
 247
 248 ## [3.0.0] - 2023-10-08
 249
 250 ### Changed
 251
 252 - Remove Node.js 16.x.x (EOL) support.
 253
 254 ## [2.7.5] - 2023-10-03
 255
 256 ### Changed
 257
 258 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
 259
 260 ## [2.7.4] - 2023-09-25
 261
 262 ### Fixed
 263
 264 - Fix source maps (bundler issue).
 265
 266 ## [2.7.3] - 2023-09-24
 267
 268 ### Changed
 269
 270 - Convert pool event emitter to event emitter async resource.
 271
 272 ## [2.7.2] - 2023-09-23
 273
 274 ### Changed
 275
 276 - Add source maps to npm package to ease debugging.
 277
 278 ### Added
 279
 280 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
 281
 282 ## [2.7.1] - 2023-09-20
 283
 284 ### Fixed
 285
 286 - Ensure worker message listener used one time are removed after usage.
 287
 288 ## [2.7.0] - 2023-09-19
 289
 290 ### Fixed
 291
 292 - Fix task stealing related tasks queue options handling at runtime.
 293
 294 ### Changed
 295
 296 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
 297
 298 ### Added
 299
 300 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
 301 - Stricter worker constructor arguments validation.
 302
 303 ## [2.6.45] - 2023-09-17
 304
 305 ### Changed
 306
 307 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
 308
 309 ### Added
 310
 311 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
 312 - Add `start()` method to pool API to start the minimum number of workers.
 313 - Add `taskStealing` and `tasksStealingOnPressure` to tasks queue options to whether enable task stealing or not and whether enable tasks stealing under back pressure or not.
 314 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
 315
 316 ## [2.6.44] - 2023-09-08
 317
 318 ### Fixed
 319
 320 - Use a dedicated PAT to publish on GitHub packages registry.
 321
 322 ### Added
 323
 324 - Publish on GitHub packages registry on release.
 325
 326 ### Changed
 327
 328 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
 329
 330 ## [2.6.43] - 2023-09-08
 331
 332 ### Added
 333
 334 - Publish on GitHub packages registry on release.
 335
 336 ### Changed
 337
 338 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
 339
 340 ## [2.6.42] - 2023-09-06
 341
 342 ### Changed
 343
 344 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
 345
 346 ## [2.6.41] - 2023-09-03
 347
 348 ### Changed
 349
 350 - Optimize worker choice strategies implementation.
 351
 352 ## [2.6.40] - 2023-09-01
 353
 354 ### Fixed
 355
 356 - Do not pre-choose in WRR worker choice strategy to avoid bias.
 357 - Avoid array out of bound in worker choice strategies after worker node removal.
 358
 359 ## [2.6.39] - 2023-08-30
 360
 361 ### Fixed
 362
 363 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
 364
 365 ## [2.6.38] - 2023-08-30
 366
 367 ### Added
 368
 369 - Bundle typescript types declaration into one file.
 370
 371 ### Changed
 372
 373 - Improve interleaved weighted round robin worker choice strategy implementation.
 374
 375 ## [2.6.37] - 2023-08-28
 376
 377 ### Fixed
 378
 379 - Ensure unused worker usage statistics are deleted at runtime.
 380
 381 ### Changed
 382
 383 - Rename worker choice strategy options `choiceRetries` to `retries`.
 384 - Avoid unnecessary branching in worker choice strategies.
 385
 386 ## [2.6.36] - 2023-08-27
 387
 388 ### Fixed
 389
 390 - Fix pool `execute()` arguments check.
 391
 392 ### Changed
 393
 394 - Make continuous tasks stealing algorithm less aggressive.
 395 - Fine tune tasks stealing algorithm under back pressure.
 396
 397 ## [2.6.35] - 2023-08-25
 398
 399 ### Fixed
 400
 401 - Don't account worker usage statistics for tasks that have failed.
 402 - Fix pool information runtime and wait time median computation.
 403
 404 ### Changed
 405
 406 - Update simple moving average implementation to use a circular buffer.
 407 - Update simple moving median implementation to use a circular buffer.
 408 - Account for stolen tasks in worker usage statistics and pool information.
 409
 410 ### Added
 411
 412 - Continuous tasks stealing algorithm.
 413
 414 ## [2.6.34] - 2023-08-24
 415
 416 ### Fixes
 417
 418 - Avoid cascading tasks stealing under back pressure.
 419
 420 ### Changed
 421
 422 - Add fastpath to queued tasks rescheduling.
 423
 424 ## [2.6.33] - 2023-08-24
 425
 426 ### Fixed
 427
 428 - Fix queued tasks rescheduling.
 429
 430 ### Changed
 431
 432 - Rename tasks queue options `queueMaxSize` to `size`.
 433
 434 ### Added
 435
 436 - Task stealing scheduling algorithm if tasks queueing is enabled.
 437
 438 ## [2.6.32] - 2023-08-23
 439
 440 ### Fixed
 441
 442 - Ensure no task can be executed when the pool is destroyed.
 443
 444 ### Added
 445
 446 - Add `queueMaxSize` option to tasks queue options.
 447 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
 448 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
 449
 450 ## [2.6.31] - 2023-08-20
 451
 452 ### Fixed
 453
 454 - Fix worker choice strategy retries mechanism in some edge cases.
 455
 456 ### Changed
 457
 458 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
 459 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
 460
 461 ## [2.6.30] - 2023-08-19
 462
 463 ### Fixed
 464
 465 - Ensure pool event `backPressure` is emitted.
 466 - Ensure pool event `full` is emitted only once.
 467 - Ensure worker node cannot be instantiated without proper arguments.
 468
 469 ## [2.6.29] - 2023-08-18
 470
 471 ### Fixed
 472
 473 - Fix race condition between readiness and task functions worker message handling at startup.
 474 - Fix duplicate task function worker usage statistics computation per task function.
 475 - Update task function worker usage statistics if and only if there's at least two different task functions.
 476 - Fix race condition at task function worker usage executing task computation leading to negative value.
 477
 478 ### Added
 479
 480 - 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).
 481 - Use back pressure detection in worker choice strategies.
 482 - Add worker choice strategies retries mechanism if no worker is eligible.
 483
 484 ## [2.6.28] - 2023-08-16
 485
 486 ### Fixed
 487
 488 - Ensure pool workers are properly initialized.
 489
 490 ### Added
 491
 492 - HTTP server pool examples: express-cluster, express-hybrid.
 493
 494 ### Changed
 495
 496 - Remove now useless branching in worker hot code path.
 497
 498 ## [2.6.27] - 2023-08-15
 499
 500 ### Fixed
 501
 502 - Add `KillHandler` type definition to exported types.
 503
 504 ### Added
 505
 506 - Add `destroy` event to pool API.
 507
 508 ## [2.6.26] - 2023-08-15
 509
 510 ### Added
 511
 512 - Add kill handler to worker options allowing to execute custom code when worker is killed.
 513 - Add `listTaskFunctions()` method to pool API.
 514 - SMTP client pool example: nodemailer.
 515
 516 ## [2.6.25] - 2023-08-13
 517
 518 ### Added
 519
 520 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
 521 - WebSocket server pool examples: ws-cluster, ws-hybrid.
 522
 523 ## [2.6.24] - 2023-08-12
 524
 525 ### Added
 526
 527 - Add array of transferable objects to the `execute()` method arguments.
 528 - WebSocket server pool examples: ws-worker_threads.
 529
 530 ## [2.6.23] - 2023-08-11
 531
 532 ### Fixed
 533
 534 - 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.
 535
 536 ### Added
 537
 538 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
 539 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
 540
 541 ## [2.6.22] - 2023-08-10
 542
 543 ### Fixed
 544
 545 - Add missing `types` field to package.json `exports`.
 546
 547 ### Changed
 548
 549 - Structure markdown documentation (PR #811).
 550
 551 ## [2.6.21] - 2023-08-03
 552
 553 ### Changed
 554
 555 - Improve code documentation.
 556 - Code refactoring and cleanup for better maintainability and readability.
 557
 558 ## [2.6.20] - 2023-07-21
 559
 560 ### Fixed
 561
 562 - Fix queued tasks redistribution on error task execution starvation.
 563 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
 564
 565 ### Changed
 566
 567 - Drastically reduce lookups by worker in the worker nodes.
 568
 569 ## [2.6.19] - 2023-07-20
 570
 571 ### Added
 572
 573 - Dedicated internal communication channel for worker_threads pools.
 574
 575 ## [2.6.18] - 2023-07-19
 576
 577 ### Changed
 578
 579 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
 580
 581 ## [2.6.17] - 2023-07-16
 582
 583 ### Added
 584
 585 - Add `listTaskFunctions()` method to worker API.
 586
 587 ## [2.6.16] - 2023-07-12
 588
 589 ### Fixed
 590
 591 - Fix pool startup detection.
 592 - Fix worker task functions handling.
 593
 594 ## [2.6.15] - 2023-07-11
 595
 596 ### Added
 597
 598 - Take into account worker node readiness in worker choice strategies.
 599
 600 ## [2.6.14] - 2023-07-10
 601
 602 ### Fixed
 603
 604 - Fix task function statistics tracking.
 605
 606 ## [2.6.13] - 2023-07-10
 607
 608 ### Added
 609
 610 - Add per task function statistics tracking.
 611 - Add public methods to manipulate the worker task functions at runtime.
 612
 613 ## [2.6.12] - 2023-07-09
 614
 615 ### Fixed
 616
 617 - Workaround import issue with `node:os` module in node 16.x.x.
 618
 619 ## [2.6.11] - 2023-07-09
 620
 621 ### Fixed
 622
 623 - Fix pool readiness semantic.
 624
 625 ## [2.6.10] - 2023-07-08
 626
 627 ### Fixed
 628
 629 - Ensure workers are not recreated on error at pool startup.
 630
 631 ### Added
 632
 633 - Add `ready` and `strategy` fields to pool information.
 634 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
 635 - Add dynamic pool sizing checks.
 636
 637 ## [2.6.9] - 2023-07-07
 638
 639 ### Fixed
 640
 641 - Recreate the right worker type on uncaught exception.
 642
 643 ### Added
 644
 645 - Add minimum and maximum to internal measurement statistics.
 646 - Add `runTime` and `waitTime` to pool information.
 647 - Check worker inactive time only on dynamic worker.
 648
 649 ## [2.6.8] - 2023-07-03
 650
 651 ### Fixed
 652
 653 - Brown paper bag release to fix version handling in pool information.
 654
 655 ## [2.6.7] - 2023-07-03
 656
 657 ### Fixed
 658
 659 - Ensure worker queued tasks at error are reassigned to other pool workers.
 660
 661 ### Added
 662
 663 - Add pool `utilization` ratio to pool information.
 664 - Add `version` to pool information.
 665 - Add worker information to worker nodes.
 666
 667 ## [2.6.6] - 2023-07-01
 668
 669 ### Added
 670
 671 - Add safe helper `availableParallelism()` to help sizing the pool.
 672
 673 ### Fixed
 674
 675 - Ensure message handler is only registered in worker.
 676
 677 ## [2.6.5] - 2023-06-27
 678
 679 ### Known issues
 680
 681 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
 682
 683 ### Fixed
 684
 685 - Artificial version bump to 2.6.5 to workaround publication issue.
 686 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
 687 - Ensure pool event is emitted before task error promise rejection.
 688 - Fix queued tasks count computation.
 689
 690 ### Removed
 691
 692 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
 693
 694 ## [2.6.4] - 2023-06-27
 695
 696 ### Known issues
 697
 698 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
 699
 700 ### Fixed
 701
 702 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
 703 - Ensure pool event is emitted before task error promise rejection.
 704 - Fix queued tasks count computation.
 705
 706 ### Removed
 707
 708 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
 709
 710 ## [2.6.3] - 2023-06-19
 711
 712 ### Fixed
 713
 714 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
 715 - Update strategies internals after statistics computation.
 716
 717 ### Changed
 718
 719 - Optimize O(1) queue implementation.
 720
 721 ## [2.6.2] - 2023-06-12
 722
 723 ### Fixed
 724
 725 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
 726
 727 ## [2.6.1] - 2023-06-10
 728
 729 ### Added
 730
 731 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
 732
 733 ### Fixed
 734
 735 - Fix average statistics computation: ensure failed tasks are not accounted.
 736
 737 ## [2.6.0] - 2023-06-09
 738
 739 ### Added
 740
 741 - Add `LEAST_ELU` worker choice strategy (experimental).
 742 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
 743
 744 ### Changed
 745
 746 - Refactor pool worker node usage internals.
 747 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
 748 - Breaking change: pool information `info` property object fields have been renamed.
 749
 750 ### Fixed
 751
 752 - Fix wait time accounting.
 753 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
 754 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
 755
 756 ## [2.5.4] - 2023-06-07
 757
 758 ### Added
 759
 760 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
 761
 762 ### Changed
 763
 764 - Compute statistics at the worker level only if needed.
 765 - Add `worker_threads` options to thread pool options.
 766
 767 ### Fixed
 768
 769 - Make the `LEAST_BUSY` strategy only relies on task runtime.
 770
 771 ## [2.5.3] - 2023-06-04
 772
 773 ### Changed
 774
 775 - Refine pool information content.
 776 - Limit pool internals public exposure.
 777
 778 ## [2.5.2] - 2023-06-02
 779
 780 ### Added
 781
 782 - Add `taskError` pool event for task execution error.
 783 - Add pool information `info` property to pool.
 784 - Emit pool information on `busy` and `full` pool events.
 785
 786 ## [2.5.1] - 2023-06-01
 787
 788 ### Added
 789
 790 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
 791 - Add `error` pool event for uncaught worker error.
 792
 793 ## [2.5.0] - 2023-05-31
 794
 795 ### Added
 796
 797 - Switch pool event emitter to `EventEmitterAsyncResource`.
 798 - Add tasks wait time accounting in per worker tasks usage.
 799 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
 800
 801 ### Changed
 802
 803 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
 804
 805 ## [2.4.14] - 2023-05-09
 806
 807 ### Fixed
 808
 809 - Ensure no undefined task runtime can land in the tasks history.
 810 - Fix median computation implementation once again.
 811
 812 ### Added
 813
 814 - Unit tests for median and queue implementations.
 815
 816 ## [2.4.13] - 2023-05-08
 817
 818 ### Fixed
 819
 820 - Fix worker choice strategy options validation.
 821 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
 822
 823 ## [2.4.12] - 2023-05-06
 824
 825 ### Added
 826
 827 - Support multiple task functions per worker.
 828 - Add custom worker weights support to worker choice strategies options.
 829
 830 ### Changed
 831
 832 - Use O(1) queue implementation for tasks queueing.
 833
 834 ### Fixed
 835
 836 - Fix median computation implementation.
 837 - Fix fair share worker choice strategy internals update.
 838
 839 ## [2.4.11] - 2023-04-23
 840
 841 ### Changed
 842
 843 - Optimize free worker finding in worker choice strategies.
 844
 845 ## [2.4.10] - 2023-04-15
 846
 847 ### Fixed
 848
 849 - Fix typescript type definition for task function: ensure the input data is optional.
 850 - Fix typescript type definition for pool execute(): ensure the input data is optional.
 851
 852 ## [2.4.9] - 2023-04-15
 853
 854 ### Added
 855
 856 - Add tasks queue enablement runtime setter to pool.
 857 - Add tasks queue options runtime setter to pool.
 858 - Add worker choice strategy options runtime setter to pool.
 859
 860 ### Changed
 861
 862 - Remove the tasks queuing experimental status.
 863
 864 ### Fixed
 865
 866 - Fix task function type definition and validation.
 867 - Fix worker choice strategy options handling.
 868
 869 ## [2.4.8] - 2023-04-12
 870
 871 ### Fixed
 872
 873 - Fix message between main worker and worker type definition for tasks.
 874 - Fix code documentation.
 875
 876 ## [2.4.7] - 2023-04-11
 877
 878 ### Added
 879
 880 - Add worker tasks queue options to pool options.
 881
 882 ### Fixed
 883
 884 - Fix missing documentation.
 885
 886 ## [2.4.6] - 2023-04-10
 887
 888 ### Fixed
 889
 890 - Ensure one task at a time is executed per worker with tasks queueing enabled.
 891 - Properly count worker executing tasks with tasks queueing enabled.
 892
 893 ## [2.4.5] - 2023-04-09
 894
 895 ### Added
 896
 897 - Use monotonic high resolution timer for worker tasks runtime.
 898 - Add worker tasks median runtime to statistics.
 899 - Add worker tasks queue (experimental).
 900
 901 ## [2.4.4] - 2023-04-07
 902
 903 ### Added
 904
 905 - Add `PoolEvents` enumeration and `PoolEvent` type.
 906
 907 ### Fixed
 908
 909 - Destroy worker only on alive check.
 910
 911 ## [2.4.3] - 2023-04-07
 912
 913 ### Fixed
 914
 915 - Fix typedoc generation with inheritance.
 916
 917 ## [2.4.2] - 2023-04-06
 918
 919 ### Added
 920
 921 - Add `full` event to dynamic pool.
 922 - Keep worker choice strategy in memory for conditional reuse.
 923
 924 ### Fixed
 925
 926 - Fix possible negative worker key at worker removal in worker choice strategies.
 927
 928 ## [2.4.1] - 2023-04-05
 929
 930 ### Changed
 931
 932 - Optimize worker choice strategy for dynamic pool.
 933
 934 ### Fixed
 935
 936 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
 937
 938 ## [2.4.0] - 2023-04-04
 939
 940 ### Added
 941
 942 - Add `LESS_BUSY` worker choice strategy.
 943
 944 ### Changed
 945
 946 - Optimize worker storage in pool.
 947 - Optimize worker alive status check.
 948 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 949 - Optimize `LESS_USED` worker choice strategy.
 950 - Update benchmark versus external threads pools.
 951 - Optimize tasks usage statistics requirements for worker choice strategy.
 952
 953 ### Fixed
 954
 955 - Ensure trimmable characters are checked at pool initialization.
 956 - Fix message id integer overflow.
 957 - Fix pool worker removal in worker choice strategy internals.
 958 - Fix package publication with pnpm.
 959
 960 ## [2.4.0-3] - 2023-04-04
 961
 962 ### Added
 963
 964 - Add `LESS_BUSY` worker choice strategy.
 965
 966 ### Changed
 967
 968 - Optimize worker storage in pool.
 969 - Optimize worker alive status check.
 970 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 971 - Optimize `LESS_USED` worker choice strategy.
 972 - Update benchmark versus external threads pools.
 973
 974 ### Fixed
 975
 976 - Ensure trimmable characters are checked at pool initialization.
 977 - Fix message id integer overflow.
 978 - Fix pool worker removal in worker choice strategy internals.
 979 - Fix package publication with pnpm.
 980
 981 ## [2.4.0-2] - 2023-04-03
 982
 983 ### Added
 984
 985 - Add `LESS_BUSY` worker choice strategy.
 986
 987 ### Changed
 988
 989 - Optimize worker storage in pool.
 990 - Optimize worker alive status check.
 991 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 992 - Optimize `LESS_USED` worker choice strategy.
 993
 994 ### Fixed
 995
 996 - Ensure trimmable characters are checked at pool initialization.
 997 - Fix message id integer overflow.
 998 - Fix pool worker removal in worker choice strategy internals.
 999 - Fix package publication with pnpm.
1000
1001 ## [2.4.0-1] - 2023-04-03
1002
1003 ### Added
1004
1005 - Add `LESS_BUSY` worker choice strategy.
1006
1007 ### Changed
1008
1009 - Optimize worker storage in pool.
1010 - Optimize worker alive status check.
1011 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1012 - Optimize `LESS_USED` worker choice strategy.
1013
1014 ### Fixed
1015
1016 - Ensure trimmable characters are checked at pool initialization.
1017 - Fix message id integer overflow.
1018 - Fix pool worker removal in worker choice strategy internals.
1019
1020 ## [2.4.0-0] - 2023-04-03
1021
1022 ### Added
1023
1024 - Add `LESS_BUSY` worker choice strategy.
1025
1026 ### Changed
1027
1028 - Optimize worker storage in pool.
1029 - Optimize worker alive status check.
1030 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1031 - Optimize `LESS_USED` worker choice strategy.
1032
1033 ### Fixed
1034
1035 - Ensure trimmable characters are checked at pool initialization.
1036 - Fix message id integer overflow.
1037 - Fix pool worker removal in worker choice strategy internals.
1038
1039 ## [2.3.10] - 2023-03-18
1040
1041 ### Fixed
1042
1043 - Fix package.json `exports` syntax for ESM and CommonJS.
1044
1045 ### Changed
1046
1047 - Permit SemVer pre-release publication.
1048
1049 ## [2.3.10-2] - 2023-03-18
1050
1051 ### Fixed
1052
1053 - Fix package.json `exports` syntax for ESM and CommonJS.
1054
1055 ## [2.3.10-1] - 2023-03-18
1056
1057 ### Changed
1058
1059 - Permit SemVer pre-release publication.
1060
1061 ## [2.3.10-0] - 2023-03-18
1062
1063 ### Fixed
1064
1065 - Fix package.json `exports` syntax for ESM and CommonJS.
1066
1067 ## [2.3.9] - 2023-03-18
1068
1069 ### Changed
1070
1071 - Introduce ESM module support along with CommonJS one.
1072
1073 ### Fixed
1074
1075 - Fix brown paper bag bug referencing the same object literal.
1076
1077 ## [2.3.8] - 2023-03-18
1078
1079 ### Changed
1080
1081 - Switch internal benchmarking code to benny.
1082 - Switch to TypeScript 5.x.x.
1083 - Switch rollup bundler plugins to core ones.
1084 - Switch to TSDoc syntax.
1085 - Enforce conventional commits.
1086
1087 ### Fixed
1088
1089 - Fix random integer generator.
1090 - Fix worker choice strategy pool type identification at initialization.
1091
1092 ## [2.3.7] - 2022-10-23
1093
1094 ### Changed
1095
1096 - Switch to open collective FOSS project funding platform.
1097 - Switch to ts-standard linter configuration on TypeScript code.
1098
1099 ### Fixed
1100
1101 - Fixed missing async on pool execute method.
1102 - Fixed typing in TypeScript example.
1103 - Fixed types in unit tests.
1104
1105 ## [2.3.6] - 2022-10-22
1106
1107 ### Changed
1108
1109 - Cleanup pool attributes and methods.
1110 - Refine error types thrown.
1111
1112 ### Fixed
1113
1114 - Fix continuous integration build on windows.
1115 - Fix code coverage reporting by using c8 instead of nyc.
1116
1117 ## [2.3.5] - 2022-10-21
1118
1119 ### Changed
1120
1121 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1122 - Optimize tasks usage lookup implementation.
1123
1124 ### Fixed
1125
1126 - Fix missed pool event emitter type export.
1127 - Fix typedoc documentation generation.
1128
1129 ## [2.3.4] - 2022-10-17
1130
1131 ### Added
1132
1133 - Fully automate release process with release-it.
1134
1135 ### Changed
1136
1137 - Optimize fair share task scheduling algorithm implementation.
1138 - Update benchmark versus external pools results with latest version.
1139
1140 ## [2.3.3] - 2022-10-15
1141
1142 ### Added
1143
1144 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1145
1146 ## [2.3.2] - 2022-10-14
1147
1148 ### Changed
1149
1150 - Optimize fair share worker selection strategy implementation.
1151
1152 ### Fixed
1153
1154 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1155
1156 ## [2.3.1] - 2022-10-13
1157
1158 ### Added
1159
1160 - Pool worker choice strategies:
1161   - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1162   - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1163
1164 ## [2.2.2] - 2022-10-09
1165
1166 ### Fixed
1167
1168 - Fixed `README.md` file.
1169
1170 ## [2.2.1] - 2022-10-08
1171
1172 ### Added
1173
1174 - Dynamic worker choice strategy change at runtime.
1175
1176 ## [2.2.0] - 2022-01-05
1177
1178 ### Breaking Changes
1179
1180 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1181
1182 ## [2.1.0] - 2021-08-29
1183
1184 ### Added
1185
1186 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1187
1188 ### Breaking Changes
1189
1190 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1191 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1192 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1193 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1194
1195 ## [2.0.2] - 2021-05-12
1196
1197 ### Bug fixes
1198
1199 - Fix `busy` event emission on fixed pool type
1200
1201 ## [2.0.1] - 2021-03-16
1202
1203 ### Bug fixes
1204
1205 - Check if pool options are properly set.
1206 - `busy` event is emitted on all pool types.
1207
1208 ## [2.0.0] - 2021-03-01
1209
1210 ### Bug fixes
1211
1212 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1213
1214 ### Breaking Changes
1215
1216 - `FullPool` event is now renamed to `busy`.
1217 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1218   _Find more details on our JSDoc._
1219
1220 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1221
1222 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1223
1224 ### Pool options types declaration merge
1225
1226 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1227
1228 #### New `export` strategy
1229
1230 ```js
1231 // Before
1232 const DynamicThreadPool = require('poolifier/lib/dynamic')
1233 // After
1234 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1235 ```
1236
1237 But you should always prefer just using
1238
1239 ```js
1240 const { DynamicThreadPool } = require('poolifier')
1241 ```
1242
1243 #### New type definitions for input data and response
1244
1245 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1246 _This is not a limitation by poolifier but Node.js._
1247
1248 #### Public property replacements
1249
1250 `numWorkers` property is now `numberOfWorkers`
1251
1252 #### Internal (protected) properties and methods renaming
1253
1254 These properties are not intended for end users
1255
1256 - `id` => `nextMessageId`
1257
1258 These methods are not intended for end users
1259
1260 - `_chooseWorker` => `chooseWorker`
1261 - `_newWorker` => `createWorker`
1262 - `_execute` => `internalExecute`
1263 - `_chooseWorker` => `chooseWorker`
1264 - `_checkAlive` => `checkAlive`
1265 - `_run` => `run`
1266 - `_runAsync` => `runAsync`
1267
1268 ## [1.1.0] - 2020-05-21
1269
1270 ### Added
1271
1272 - ThreadWorker support async functions as option
1273 - Various external library patches
1274
1275 ## [1.0.0] - 2020-01-24
1276
1277 ### Added
1278
1279 - FixedThreadPool implementation
1280 - DynamicThreadPool implementation
1281 - WorkerThread implementation to improve developer experience