pub get fails from Dart Editor 1.10.0 on medium-size polymer project

[DartBot]

Originally opened as dart-lang/sdk#23552

This issue was originally filed by alastair....@gmail.com

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What steps will reproduce the problem?

1. Run pub-get on my project, either from within Dart Editor or from the command line
2. "Resolving dependencies..." appears, with a timer
3. pub-get pegs 100% CPU, consumes 0.6 Gb of RAM and does not complete, eventually has to be terminated (longest I let it run was about 6 minutes) and Dart Editor then reports pub-get failed

What is the expected output? What do you see instead?

Expected result is for pub-get to upgrade packages as per constraints in pubspec.yaml

What version of the product are you using?

1.10.0

On what operating system?

Linux/64

What browser (if applicable)?

N/A

Please provide any additional information below.

Project dependencies listed in pubspec.yaml:

  dart_config: any
  dbcrypt: any
  lawndart: any
  lzma: any
  mailer: any
  memcached_client: any
  paper_elements: any
  petitparser: any
  polymer: '>=0.16.0 <0.17.0'
  postgresql: any
  unittest: any

I know I can download the package I intend to upgrade manually from pub, so this isn't urgent for me. pub get has worked fine in the past on the same project - perhaps something changed in the back-end for 1.10.0?

[DartBot]

<img src="https://avatars.githubusercontent.com/u/405837?v=3" align="left" width="48" height="48"hspace="10"> Comment by zoechi

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Please see https://groups.google.com/a/dartlang.org/forum/#!topic/misc/veOqltoM3aE

[DartBot]

This comment was originally written by alastair....@gmail.com

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Ok, that's good to know; but with a change this significant, with an impact this serious, it would have been good to know in advance. I certainly wasn't aware of it, I can't find mention of it (or, indeed, any release notes for 1.10.0 in general) on the dartlang website, there's no mention of it in the G+ dartlang community that I can see, and perhaps most importantly the tools themselves don't report anything. Perhaps there's a better way of finding out about this rather than after the fact?

[DartBot]

This comment was originally written by alastair.car...@gmail.com

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Ok, I've removed the "any" constraints in my project's pubspec.yaml, and replaced them with "^*" versions based on the latest listed on pub. So, pubspec.yaml now reads like this:

  dart_config: ^0.5.0
  dbcrypt: ^0.2.1
  lawndart: ^0.9.0
  lzma: ^0.3.0
  mailer: ^0.8.12
  memcached_client: ^0.5.3
  paper_elements: ^0.7.1
  petitparser: ^1.4.3
  polymer: '>=0.16.0 <0.17.0'
  postgresql: ^0.3.0+2
  unittest: ^0.12.2

There is no change in behaviour; pub get still pegs CPU at 100% and needs to be terminated after multiple minutes.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/405837?v=3" align="left" width="48" height="48"hspace="10"> Comment by zoechi

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This was posted 2 days ago :)
This wasn't caused by a specific change, more a conclusion from experience.
The intention of the any constraint was to make it easy for developers, but experienced has shown that pub sometimes just can't find a compatible set of dependencies in reasonable time and needs more guidance.
Therefore the decision was made to not suggest any anymore, but to suggest developers should set concrete constraints instead.

[DartBot]

This comment was originally written by alastair....@gmail.com

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Created a new, completely blank project with the dependencies listed in comment #­1 (i.e. with "any" constraints). pub get worked with the following output:

Resolving dependencies...

• analyzer 0.25.0+1 (0.25.1-alpha.0 available)
• args 0.13.1
• barback 0.15.2+4
• browser 0.10.0+2
• cli_util 0.0.1+2
• code_transformers 0.2.9
• collection 1.1.1
• core_elements 0.7.1+2
• crypto 0.9.0
• csslib 0.12.0+1
• dart_config 0.5.0
• dart_style 0.1.8
• dbcrypt 0.2.1
• drandom 0.0.3
• fixnum 0.9.1+2
• glob 1.0.4
• html 0.12.1+1
• http_parser 0.0.2+6
• initialize 0.6.1
• intl 0.12.4
• lawndart 0.9.0
• logging 0.11.1
• lzma 0.3.0
• mailer 0.8.12
• matcher 0.12.0+1
• memcached_client 0.5.3
• mime 0.9.3
• observe 0.13.1+1
• paper_elements 0.7.1
• path 1.3.5
• petitparser 1.4.3
• polymer 0.16.3+3
• polymer_expressions 0.13.1
• polymer_interop 0.1.1
• pool 1.0.2
• postgresql 0.3.0+2
• pub_semver 1.2.1
• quiver 0.21.4
• shelf 0.6.1+2
• shelf_static 0.2.2
• shelf_web_socket 0.0.1+2
• smoke 0.3.3+1
• source_maps 0.10.1
• source_span 1.1.2
• stack_trace 1.3.2
• string_scanner 0.1.3+1
• template_binding 0.14.0+2
• test 0.12.0 (0.12.2 available)
• unittest 0.12.2
• utf 0.9.0+2
• watcher 0.9.5
• web_components 0.11.4+1
• when 0.2.0
• which 0.1.3
• yaml 2.1.2
  Changed 55 dependencies!
  Precompiling dependencies...
  Loading source assets...
  Loading initialize/build/loader_replacer, initialize, observe, code_transformers/src/delete_file, polymer_interop/src/build/replace_polymer_js, smoke/src/default_transformer, web_components/build/mirrors_remover and web_components transformers...
  Loading polymer transformers...
  Precompiled core_elements, dart_style, initialize, intl, observe, paper_elements, polymer, polymer_interop, smoke and web_components.
  Precompiling executables...
  Loading source assets...
  Loading code_transformers/src/delete_file, observe, initialize/build/loader_replacer, initialize, smoke/src/default_transformer, web_components/build/mirrors_remover, web_components and polymer_interop/src/build/replace_polymer_js transformers...
  Loading polymer transformers...
  Precompiled polymer:new_element.
  Precompiled polymer:new_entry.
  Precompiled unittest:unittest.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/12753545?v=3" align="left" width="48" height="48"hspace="10"> Comment by ajrcarey

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Not sure if anything changed, but I can report that pub get on the same project works correctly and without significant delay on 1.10.1. Thanks!