Jenkins Google Summer of Code Office Hours, 19 Mar 2019

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From YouTube: Jenkins GSoC Q&A for students. Mar 19, 2019

Description

Q&A session for students interested in Jenkins GSoC

A

Yep so yeah so welcome to the regular cony session for students interested in merging with google Summer of Code today in this session, and if you also have a number of students and mentors speaking so it's a kind of unofficial meeting just for corny, and we can just press it with it. If you are interested about do so, once starters etcetera, we have another office hours for mentors and for jae suk's our project tomorrow.

B

A

So yeah I think we can just pass it with questions so yeah. If you have any questions, just ask them or just write them in the chat and then we will be able to answer them.

C

Ok should I start, sir.

C

Ok, so my name is frost, acuity and I mean interested in the g-shock artifacts promotion, plugin projects. Ok, so I have a couple of question. It's like it was. It was pretty tricky for me to understand the whole flow of the project.

C

What is desired during the project so like I, just want to ask you that the promotion job that you are talking about, the promotion, new promotion, plug-in that it should be represented as a promotion, job right so and, and that should yeah again and like should it be created in such a way that it would encompass both the Freestyle and pipeline projects, or it should be a different job for iPhone. Only like.

A

Well, you know try to quickly answer this question, so probably I should just show you some code to explain why we are doing this project at all.

D

A

Yeah, you have food habits, shy, promoted, build swinging, so this plugin, which is widely used, but the main problem of this plugging a battery. It supports only freestyle projects. Well, actually, it supports all abstract project bill types, so please maybe a job, this etc, but it doesn't support pipeline another similar jobs, just because it's a potential design. It was created long before the pipeline was created.

A

The main problem model of this project would we have now if there is promotion, class and this class actually implements abstract build, though it's not built itself and promotion process is also not from job, but you may see that this causes hijacker being existing API, so Jenkins. So you may see. Promotion process implements abstract project and in addition to that, there is promoted, built property and the main problem here that it meets folder, although it doesn't present the folder on its own him to properly the implementation.

A

So you may see that it's I can group in Jenkins and it causes a lot of architectural concerns because yeah the cost doesn't really implement how jeanikins tche is designed. So item group is supposed to be item itself in the most of the cases, but he's a job property. So many apiaries don't work correct, and this structure is also not really extensible. If we talk about pipeline because well for starters, you may see that it includes abstract project right here.

A

So if you want to make a compatible spy plane, you would have to rewrite almost the entire implementation to make it compatible with this pipeline and even with it, it would just break binary compatibility and finally get the implementation is just not where one would expect from promoting bills, so they, instead of in Greece, think to actually have a separated job which can be triggered from promotion.

A

So, instead of emulating a kind of folder or item group for a particular job, we think that it might be better to just have another job which would be a promotion, and then you could trigger this job from existing management.

A

C

A proposal, a different promotion job would be created that will like work for both freestyle and pipeline. Where they said, do you mean that yeah it would be nice? So what.

A

Now I mean about a new plugin. It would be great if it supports both.

C

Job types, for that said the previously held a promotion bill plug-in that we have inside the configure category. We need to copy that code into a new job right. We need to refactor the entire process if we need to make it compatible with both the Freestyle and the Python project. After one job, oh I mean a common job should be created so that it could work on both the sides. Yep.

A

Oh by understanding.

C

Answer you mentioned, you mentioned something like you're triggering promotions as steps like in pipelines. Yesterday, you mentioned triggering promotions as tips, which means like, as far as I can understand it's like. After the completion of the pipeline, it will a new groovy. A new stage would be included in the groovy script so that it will trigger the promotion. What would that mean? So what is its.

A

Meaning it will be just a step, for example, you can trigger a promotion or for one job from another, so that a plug-ins like Co PR efforts or release plug-in in Jenkins, and you could just implement the step which could trigger promotion of another project and in such case you could implement your pipeline, which integrates with multiple jobs. It's one of the ways. Another way is that there is a step which triggers promotion for the job itself.

A

So, for example, you build artifacts, you tested them, and then you trigger promotion which runs synchronously, but you still figure it out from the pipeline so that you can trace the connection between projects. Okay,.

C

The answer and next question is, like you said, defining promotion in properties yesterday defining promotion in properties. What could what is its meaning like? Would it mean that there, in inside the job section there would be properties like environment that way it would be deploy later on yeah.

A

Right so on a CD systems approach, they have definitions from the way, try to implement configurations code and they try to put all the definitions inside one file. It may be brutally file, it may be declarative for pipeline definition or it may be just whatever you know file, but they still try to have everything in one place and it would be nice to have the same. My engineers, ok.

C

The last patient is like in pipeline, which will allow manual promotions. Also, right, like we do in the freeform. Projects, will also allow manual promotions like this, and those things also be included in the promotion. Job yeah.

A

Right, so you can try promoted bills bunion it effectively implements what we would like to see in pipeline. So yeah you could add some enhancements, but you have other those plug-in already supports automatic and mono promotions and yeah I think that if we could implement it in their new plug-in, it would be really nice.

C

And that the plug-in that we have named promotion, simple, build plug-in, so it's total function is just to trigger things manually right. What is its main function? I couldn't get that the difference between promoted pipeline and promoted, simple build pipeline plug-in. So somebody.

A

Here, try to implement a simple promotion plug-in they started this project. They got some release, but I would say that. Well, they just implemented what they needed for the environment. So it's a subset of the promoted bills, plug-in if it connect the source of inspiration for you how it could be implemented. That's fine, but here personally, I have never considered the simple promoted bills as a separate plug in person.

C

So the promoted bill plug-in also also has the manually triggering triggering function. If.

A

I recall correctly: yes thank.

C

A

So we thanks to all others on the call, so my proposal would be to start from process questions and then, if we have time we will be discussing project details, because yeah I understand that many students here just I just want to discuss their projects, but he had a real goal of a speaker Thissen up on the process, so yeah any questions about the process about applications about the details. Whatever.

A

If no, we will just proceed with going through projects. If me determine answering questions.

D

Hyolyn so actually I started working on my proposal yesterday. So I was thinking. I was going to the past, hear proposals. They have a like concrete timeline about what they are doing. So we need to have a very hard and fast sort of type timeline or a very brief timeline about what we are going to do, because what they did was in the time when they particularly explained in each week what they are going to work on. So.

A

D

I can see yeah.

A

So I will show what nice talking about.

A

E

Yeah, so there are double yeah.

F

A

Problem, you're referencing, something quite a bit, so he, if you scroll down you wants its final loads. Of course, if you scroll down, you may see that there is.

A

Sorry I just noticed when you looked up and it's really slow.

A

Yeah, just don't see.

A

Yeah, oh yeah, wake him so yeah. You may see that there is some definition go to the timeline, so they D he did well. You can define a detailed timeline and maybe on the daily on, if you want, but the problem that, of course you cannot make sure this timeline, because there are so many details which we need to discuss, and you know what we have know that we usually expect students to submit a rough timeline as a part of the project proposal.

A

So here you can start from something like that to define main mind milestones. What we asked there are three coding of phases plus community bonding. So there are four milestones and which milestone. You can start from defining the variables because yeah. So there is a list of deliverables she you wanted to implement in this project. So what we asked you to map deliverables to the timeline. It will help us to the project ones.

A

So, for example, here let's say in an ajumma, you will have fun until they're, just coding, please- and you can say that at this phase you want to ship something like a couple of features, maybe plug-in skeleton make it alpha release of your plugin. Something like that. So this is what the gunite say. We expect from you. If you want to go forward and to utilize the things it's perfectly fine, but yeah, we really plan to do some charity mapping as a part of community bonding, so we have new will be still.

A

They think what you want to do, because yeah it's hard to estimate what would be the real time. You're gonna need for particular deliverables.

A

So just take top-level items from here and try mapping to them to the timeline. It would be a good for your proposal.

G

Hello hi I wanted to ask good thing that I have made the sort of a proposal I'm still working on it. Would it be fine to show it to you and the other mentors for the role start, debugging.

A

You just posted and then mentors review it and provide feedback. That's why we recommend to start earlier. So if you already have a proposal just post it in the chat, for example, we've done it for second, yes, too many charts yeah. So here you may see that.

A

E

Last at last, at last the last message which I, oh yeah, there you'll see I, don't idea so.

A

You can still use all the new stuff in this proposal, and you know what we recommend you do is when you create a proposal, you make sure that it's actually shaped with everyone, so that it's public editor. Everybody can comment, okay, so something like that. It helps other community members to be able to join the discussion to provide feedback and the same as project ideas. Please make sure that this first proposals are public so that we can review them together and enhance them.

G

Okay- and you can ask about some questions from the pugilist.

A

Justly finish, the process, questions and then yeah, okay,.

A

G

Just one second I was asking about for the cache invalidation. We have the item listener right from the extension point, provide and Jenkins core and I saw the structure of the classes. So job extends an item. Mm-Hmm I mean job is an item so can be like whenever any item is created. We could check that if it is an instance of job or not, and then we can modify the cache yeah.

A

Exactly so, yeah all the jobs in Jenkins instances of items so actually item. There are two types, this top-level item, it's something you can see in the drink, its web interface and it's also sub items for if you use multi branch project. The sub item sells joking yesterday and yeah, but all jobs items miss some extension. What yeah? If we were talking about remotely build sir today so here you may see that there are three key things like this promotion, so you may see that promotion is actually abstract build.

A

So it's amazed and so from and promotion process is actually an instance of abstract project. So it's an instance of a job. So it's an instance of heigen, but this item doesn't really exist within these three or four units within dresses. So it's a kind of detached items out. I came out of 33, so yeah, it's a bit tricky, but yeah each case. For now. So in your project, you can safely assume that all job search the items and they belong to the three.

G

Okay, so there would be some cases which I need to work on.

A

Well here, as you said, you can just assume, but you check whether I came as a job and education.

G

Okay and another question I think that was unanswered was that having a database like embedding and database into the plugin.

A

To answers, if you want to have in memory database yeah, if you want to help database which persists the data on the disk, I would rather advise against a bed for this particular plugin, because once you start persisting bit on the disk, you may start getting a various issues. For example, this backup management is restart of the instances etc.

A

H

A

Think so you will be able recreate it on the man. Okay,.

A

So how it usually happens and I think it may might be useful for other students as well, but when we stop talk about static objects in Lincoln's, there are two ways: firstly, you can just a implements that available, which is okey but static. Variable can actually persist. That close to drink is three starts. If they happen in within the same GBM, and usually the advice is to actually bind it to Singleton's.

A

For example, if you take role based authorization strategy, you may see that there is an exception here, I'm just saying so: yeah extension, it's the implementation, but actually, if you scroll down yeah, so this code is a bit clearer design right here.

A

You may see that there is an object, so this object is actually singleton for Jenkins, and here you can create, for example, transient would have a cache so that it doesn't get persisted on the disk and it still exists as a singleton object is in here drinking senseless and when this object is recreated, the very latest will be also recreated. Oh, it would be my advice how to handle it.

G

Another doubt that I had here was that whenever the plug-in is initialized, let's say after Jenkins restarts or something a lot of time would be taken to match the regular expression. Wouldn't it.

G

Yeah, when, if we consider creating a cache to populate the cashman, genkan starts up yeah.

A

Who did not take a lot of thing so that it might take a lot of time if crash is to really and if it's many items, but there are two ways. Firstly, you can implement the crash in the initializer logic, so with books, Jing startup, why? What cache is created? Of course it's not advised, but you can also open initialized acacia synchronously. The one gene starts up, you can, after all, jobs are loaded.

A

You can trigger a parallel thread which would be initializing location, the background and in such case, the performance best at that time will not be impacted.

A

Okay, yes, all in such peak, you can prevent the performance impact on the startup, but still retain all benefits of caching yeah. That makes sense.

E

Okay, yeah so now I are now doing advanced, mini SCADA like that yeah so like now after you know, two discussion with the mentors and all that we are like I just came to the conclusion that finger bending should be used for the you know, external access measure so that by using finger bending I can get the workspace ID and from that I can get the details of the path of expression. All that in from that details, I can delete the workspace right so yeah so I Greg.

E

But what now I think is that now the bills which are created by the multi branch, pipe line of logic or the multi branch pipeline project and like if someone adds multiple workspaces in the Jenkins file, then would the fingerprint work in this plugin also or else it is specific to the extra workspace manager. Only well.

A

Finger prints are being attached to on the field level, so even if you take and talk about, multi branch pipeline, so multiply inch by plan actually is organized really recently, so there is icon. Now there is item called abstract, folder or just.

B

A

Oh, okay and multi branch is actually computed folder, so it's a folder which is being the energy automatically by the background project, but this folder is still contains the common items and this item sentiment common beads. So it means that finger cranes and a lot of pipeline project will be all they behave pretty much similarly amount range by plane. So if everything is implemented correctly, you won't need to implement specific hoops or mountain range.

E

Okay yeah, so like can you just scroll down to page number eight of my proposal, yeah.

B

E

The roster page up yeah, so here's the implementation of you know of multi branch pipeline. So, like you know what first I, what my idea is that, first of all, obviously that run listener would be used for the communication between advanced abilities, color and multi branch pipeline right.

B

E

And like now, there are two methods which I finalized, which can be used for trigger that is on finalization on computer. Now. That would be like I discussed this point with the MA tensor, and he told that we will finalize one method in the community burning period so like he just suggested to write both of the methods in my proposal. So I will listed it both and like now. So this both two methods will be trigger and now for body Jenkins file like now.

E

What like now the filter methods will be given at the data bound constructor and that and the main class would be extended by the abstract step. I am be L so that methods can be used in Jenkins file, so, like user can directly use, set methods in the Jenkins file to call that a particular filter and the filter values needed to be specified in the that and after that, the period method would be implemented which will fetch the root of the work spaces of pipeline and from that by the layer of layer layer of player.

E

The filters will be executed and, after that, the actions would be.

A

Yeah I think that this level of details is fine for now. So what you need all gasp, maybe you continue working with mentors to utilize, big things, but here from logic description, it looks to be ok and yeah. People who define details do you think becoming the bowman yeah.

E

Yeah so like, I just want to confirm that, like this much detail is enough for, like I need to, you know special specify more, you know concrete detail which can be useful, like only that was my only doubt. Yeah.

A

So this level of details to be honest, this much more than enough. Ok,.

F

A

Expect students to submit something like maybe two to four pages of proposal, so it really depends. You know, so we do not actually judge. By pages we judge by oh yeah.

H

A

Yeah, I would say that this level of detail is more than enough, but probably okay focused on all of you. You may even want to consider somehow breaking it down so having details in appendix and have delete initial description in the body because yeah it may help potential members and reviewers to better understand. What is your point.

A

Doesn't make sense.

A

My salon line Erica, so so you proposal isn't about a number of pages. If you can write a good proposal, these two pages, it's perfect.

A

If you need 15 pages, it's also perfect, but here we really recommend to have at least mine sections to be short enough, so that they can be used relatively quickly and then you can put all with field say in traditions or of your proposal.

A

Okay, do we have any other questions, but chai you were pretty silent today. So if you have any questions, let us know and yes, sorry fairy pronounce the name incorrectly. It.

D

D

Actually this isn't I, don't know like it's not related to Jesus I hear one thing regarding the blue ocean: the plug-in generator it wasn't working so I raise an issue and, as you suggested, I posted on the waiting list as well, but as such I couldn't elicit a reply from any one of them. So should I follow up or like some. No one is working on that presently.

A

So they think that last week almost everybody from bullshitting was traveling, so I suspect it just good mixed. Unfortunately, so it's somewhere in the Middle East right.

D

Yeah, it's an entire group. It's on ji-suk.

A

So if it's okay to answer the question, because not everybody from the Jenkins community is in Jae Seok, so yes, sorry about that, yeah I should have noticed it. Okay,.

A

So yeah, if you have, were generic questions, it's even if you're a student, this might be too often the development increased, because it has a much bigger explosion. Okay, so here, for example, it would seem ablution generated for ablution pipeline development, okay, login tutorial, okay yeah. So here you should read over it to developers mailing list and refer you to conquer Italy. The results.

A

The original ocean developer mailing list.

A

Yeah, it's probably dropped this question and I'm sorry. It was me who missed a bit.

B

Okay, so things should.

A

B

A

And yeah, thanks again for submitting tissues and for working on this area.

H

A

From blows from JSOC team, there is Craig Rodriguez, who is one of the mentors he's particularly interested, so yeah I think that he might be able to answer.

A

Okay, so yep, if there is no response, please pick me I hope to get it processed.

A

But yeah, if you have development, related questions, something like hardcore, etc asking the developer. My name list is probably the best recommendation.

A

Okay, are they any other questions.

B

A

A

So you just told we will have two sessions tomorrow. One session use common mental meeting. Another one is another colonization, and yet next week the applications open. It doesn't change anything specifically for us because we will be still doing business as usual. All these meetings, but yeah. If you need to move it back from mentors Kristin, he stated I think them in the chats because everybody is busy. But here it's our joint interest to provide feedback to you as a part of application process so that you can get better proposals and we can.

A

We can just provide some feedback initiatives so that running better to community bonding. We are more ready and everybody can understand what would be the scope.

A

Okay, so thanks everybody and here I think.

A

Also broadcast.