Diagnostics WG Summit

mike-kaufman · 2017-11-15T21:42:29Z

Feb 12-13, 2018
Ottawa, ON Canada
Location Details & Accommodations: 2016 Ottawa_visitor_guide.pdf

Proposed Agenda

Day 1 - Feb 12 2017

Key Themes - Part1
8:30 - 9:00 - Arrive and settle in
9:00 - 9:10 - Introductions
9:10 - 9:20 - End user perspectives (Netflix)
9:20 - 9:30 - Agenda review
9:30 - 10:00 - Post Mortem - priorities/issues

10:00 - 10:30 - break

Key Themes - Part 2
10:30 - 11:00 - Monitoring - priorities/issues
11:00 - 11:15 - Debugging - priorities/issues
11:15 - 11:30 - Platform neutrality/APIs
11:30 - 12:00 - Testing and Documenation

12:00 - 1:00 - Lunch

1:00 - 3:00 - Breakout 1
3:00 - 3:30 - Break
3:30 - 5:30 - Breakout 2
5:30 - 6:00 - Demo from James/Matteo

6:30 - Dinner

Day 2 - Feb 13 2017
9:00 - 11:00 - Breakout 3
11:00 - 1:00 - Breakout 4

1:00 - 2:00 - lunch

2:00 - 3:15 - Breakout review
3:15 - 3:30 - Break
3:30 - 5:00 - Breakout review continued, recap and actions

The agenda is structured as a review of the key themes related to Diagnostics in order
lay the context for for the more in depth breakout sections, the breakout sessions
themselves and then finally a review of the output from the breakout sections and creation of
an action plan going forward.

Attendees:

Doc to refine subtopics/discussion points:
https://docs.google.com/document/d/1mB3nrCOhgKPEpPebpUEBDZQse6yKX4vwuwj-RpAWXWI/edit?usp=sharing

mhdawson · 2017-11-16T21:44:20Z

Will look into how to book a Room in our office in Ottawa and then suggest a date/time

watson · 2017-11-18T10:39:55Z

I'm in California for work from the Feb 26th to Mar 6th

danielkhan · 2017-11-18T15:16:42Z

Thank you for setting that up. I'll definitely attend if it's not in the last week of January. We should also ping @nodejs/post-mortem because if we merge, the summit would be a great kick off for that.

mhdawson · 2017-11-21T22:59:09Z

To start the discussion.

@nodejs/diagnostics
@nodejs/post-mortem
@nodejs/tsc

I would suggest we hold the summit on Mon Feb 12 and Tue Feb 13 in Ottawa at the IBM office. The weekends before/after include Winderlude if you like skating and the IBM office is close the airport if you want to just fly in/out. Please comment as to wether you want to participate and if those those days work for you or not and we'll either confirm or iterate as necessary.

I would suggest we structure discussion in terms of themes as we did at the first vm summit.

The themes I'd have in mind (probably incomplete, please make additional suggestions) would be:

Post mortem diagnosis
- Core tooling that should be part of Node.js itself
  - heapdump generation
  - node report generation (light weight easy to consume dump)
  - core dump generation
- Core dump introspection
  - llnode, mdb, etc.
  - javascripts APIs
  - maintenance/automation of keeping required data up to date
- Supporting Promises/async functions
- What is missing ?
Monitoring
- Asynchronous context tracking
  - Async Hooks
- Tracing
  - Adding Node.js trace points
  - Flight recorder
- Loader Hooks ?
- Profiling
- What else should Node.js have in order to support great monitoring
Debugging
- Not sure what we need to discuss on this front....
Documentation/Guidance
- Module developers guide (as discussed in VM summit in Germany)
- How to investigate common issues
Testing
- We don't necessarily have good testing or visibility into the testing we do have
- Diagnostics test pass/fail should be a release criteria ?
Platform neutrality/APIs
- Expanding N-API to cover diagnostics APIs ?
- Platform neutral internal APIs
What's missing
- How does Node.js stack up against other languages in terms of diagnostics
- Would be good to be able to capture what we have, what we need to work on and have deck to
  position that Node.js is good from a diagnostics point of view (possibly after some work)

We can structure however we want but at the first vm summit we had the following general approach

Morning of first day, discuss key themes as a group. At the end of the morning identify groups that
want to break out to discuss specific themes
Afternoon of first day/Morning of second day groups meet to discuss specific themes, make concrete
plans for next steps and start working on those steps.
Afternoon of second day get back together as a full group and each sub-group presents an overview of
what they discussed/planned/completed.

Depending on the number of people we get and the interest in the themes it may or may not make sense to break out into sub-groups.

jasnell · 2017-11-21T23:01:27Z

Definitely +1, glad to see this move forward. I'll definitely be there.

jasnell · 2017-11-21T23:06:51Z

I will say that Feb 13th is not a great day as I would need to leave early in order to not be traveling on Feb 14th... which is problematic from a My-Wife-Will-Kill-Me-If-I'm-Gone-On-Valentines-Day perspective. That said, Feb 8-9 and Feb 19-23 are out for me also.

dshaw · 2017-11-21T23:30:30Z

+1

danielkhan · 2017-11-22T11:57:00Z

+1

benjamingr · 2017-11-22T12:26:42Z

Would be amazing to see a push for a better postmortem story for async functions.

mhdawson · 2017-11-22T14:15:16Z

@benjamingr I knew I was forgetting something. I had thought of that at one point but missed it when putting together the overview.

mhdawson · 2017-11-22T14:17:14Z

@benjamingr added

Supporting Promises/async functions

under the post mortem section. If that's not what you had in mind just give me some text to add

ofrobots · 2017-11-22T16:24:24Z

I'm tentative. I have other travel planned for the second half of Feb. I will be able to confirm closer to the date.

jkrems · 2017-11-22T20:54:59Z

I'll be there and I'm pretty flexible about the dates.

benjamingr · 2017-11-22T21:15:27Z

@mhdawson that's exactly what I meant, thank you for including and considering it.

komawar · 2017-11-22T21:22:17Z

I would like to attend, prefer Feb.

hashseed · 2017-11-24T07:38:24Z

I would like to attend as well.

watson · 2017-11-24T14:24:24Z

Those dates sounds fine with me 👍

mhdawson · 2017-11-24T14:38:59Z

@bmeurer FYI in case you have not seen this yet.

bmeurer · 2017-11-24T18:39:42Z

I have seen this already, yes. Chatted with @hashseed today and we decided it makes a lot of sense for him to go, since he knows the relevant parts of V8 a lot better than I do. 👍

watson · 2017-11-24T18:48:00Z

How soon can we settle on dates? I'd prefer to buy plane tickets and book hotel before it gets too expensive 😃

mhdawson · 2017-11-24T20:16:26Z

@watson, would a target of agreeing by mid-to-end next week work ?

So far it sounds like my proposed dates are ok but was thinking we should give it a few more days given the Thanksgiving weekend in the US.

watson · 2017-11-24T22:08:11Z

Absolutely, no problem 😃

kjin · 2017-11-28T14:50:30Z

+1, mid-February would be great.

fhinkel · 2017-12-04T11:38:24Z

I'll probably be joining, too. Are the dates set yet?

cjihrig · 2017-12-04T14:12:45Z

These dates work for me.

mhdawson · 2017-12-04T17:23:54Z

We are pretty much set on Mon Feb 12 and Tue Feb 13. I have a room booked that should hold 20. I just want to take a look at it tomorrow when I'm in the office and then I will comment here confirming.

skaegi · 2018-02-07T03:50:02Z

@mhdawson Although not a member of the WG I'm in Ottawa and would also like to attend. I'm currently part of TC39 (though less involved now) and can offer some perspective having both written a JavaScript debugger and participated in earlier efforts to standardize a JavaScript Debug Protocol.

mhdawson · 2018-02-07T14:33:53Z

@skaegi added. Looking forward to seeing you there.

mhdawson · 2018-02-07T15:01:46Z

@mhdawson
@mcollina
@mike-kaufman
@Qard
@hashseed
@watson
@mrkmarron
@jasnell
@danielkhan
@komawar
@joyeecheung
@cjihrig
@fhinkel
@jkrems
@ofrobots
@dshaw
@kjin
@aruneshchandra
@hekike
@mmarchini
@Flarna
@Hollerberg
@distracteddev
@apapirovski
@skaegi

I've made a reservation for Monday at 6:30 at a pub that is a short walk down the street from the office. They tell me the menu is typical pub food and there are a few vegetarian options. I've assumed most people will want to come along but they would like a good estimate of the number of people so can each of you use the thumbs up/down to confirm if you will be coming. I only have the budget for lunch so we'll each be on our own to cover the cost of dinner.

Fishrock123 · 2018-02-09T16:01:04Z

Heya - there was a bit of a planning snafu but it looks like I’ll be making my way up, one way or other.

@mhdawson could you add me to that? Thanks!

mhdawson · 2018-02-09T16:22:28Z

@Fishrock123 added.

apapirovski · 2018-02-11T13:21:10Z

@mhdawson Unfortunately I have to cancel at the last minute. A few of my move-related appointments ended up falling on Tuesday and I can't reschedule. 😞

watson · 2018-02-11T16:18:40Z

Unfortunately Air Canada have canceled my flight due to snow in Ottawa. They have put me on a flight tomorrow instead, but it doesn’t land in Ottawa until 9:52am. I’ll just take a taxi directly to the office, so hopefully I’ll be there before 11 depending on how difficult immigration is