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Boats and Streams - Aptitude Questions and Answers

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I've started playing with Git and have come across the terms "upstream" and "downstream". I've seen these before but never understood them fully. In terms of source control, you're " downstream " when you copy clone, checkout, etc from a repository.

Information flowed "downstream" to you. When you make changes, you usually want to send them back " upstream " so they make it into that repository so that everyone pulling from the same source is working with all the same changes.

This is mostly a social issue of how everyone can coordinate their work rather than a technical requirement of source control.

You want to get your changes into the main project so you're not tracking divergent lines of development. Sometimes you'll read about package or release managers the people, not the tool talking about submitting changes to "upstream".

That usually means they had to adjust the original sources Upstream Downstream Problems With Solutions so they could create a package for their. They don't want Upstream Downstream Problems With Solutions Vpn to keep making those changes, so if they send them "upstream" to the original source, they shouldn't have to deal with the same issue in the next release. When you read in git tag man page :. One important aspect of git is it is upstream downstream problems with solutions for, and being distributed largely means there is no inherent "upstream" or "downstream" in the.

Those notions are always relative between two repos and depends on the way data flows:. The DVCS Distributed Version Upstream downstream problems with solutions for System twist is: you have no idea what downstream actually is, beside your upstream downstream problems with solutions for repo relative to the remote repos you have declared.

In term of " flow of data ", your repo is at the bottom "downstream" of a flow coming from upstream repos "pull from" and going back to the same or other upstream repos "push to".

It means you are pulling from an "upstream" repo where a rebase took placeand you the "downstream" repo is stuck with the consequence lots of duplicate commits, because the branch rebased upstream recreated the commits of the same branch you have locally.

That is bad because for one "upstream" repo, there can be many downstream repos i. Again, with the "flow of data" analogy, in a DVCS, one bad command "upstream" can have a " ripple upstream downstream problems with solutions for " downstream.

Note: this is not limited to data. It also applies to parametersas git commands like the "porcelain" ones often call internally other git commands the "plumbing" ones.

See rev-parse man page :. Many git porcelainish commands take mixture of flags i. This command is used to distinguish between. The term upstream also has some unambiguous meaning as comes to the suite of GIT tools, especially relative to tracking. It will print an error message otherwise:. Just issue :. For every branch that is up to date or upstream downstream problems with solutions for pushed, add upstream tracking reference, used by argument-less git-pull 1 and other commands.

For more information, see branch. Defines, together with branch. It defaults to origin if no remote is configured. Generally speaking, upstream is where you cloned from the origin.

Downstream is any project that integrates your work with other works. There is, alas, another use of "upstream" that the other answers here are not getting at, namely to refer to the parent-child relationship of commits within a repo. Scott Chacon in the Pro Git book is particularly prone to this, and the results are unfortunate. Do not imitate this way of speaking. He wants to say that commit B is the only child of the only child of Why this direction should be called "upstream" rather than "downstream", or why the geometry of such a pure straight-line graph should be described "directly upstream", is completely unclear and probably arbitrary.

The man page for git-merge does a far better job of explaining this relationship when it says that "the current branch head is an ancestor of the named commit. Indeed, Chacon himself appears to use "downstream" later to mean exactly the same thing, when he speaks of rewriting all child commits of a deleted commit:.

You must rewrite all the commits downstream from 6df76 to upstream downstream problems with solutions for remove this file from your Git history. Basically he seems not to have any clear idea what he means by "upstream" and "downstream" when referring to the history of commits over time.

This use is informal, then, and not to be encouraged, as it is just confusing. It is perfectly clear that every commit except one has at least one parent, and that parents of parents are thus ancestors; and in the other direction, commits have children and descendants.

That's accepted terminology, and describes the directionality of the graph unambiguously, so that's the way to talk when you want upstream downstream problems with solutions for describe how commits relate to one another within the graph geometry of a repo.

Do not use "upstream" or "downstream" loosely in this situation. The man page does go on to describe a situation where the use of "upstream" is legitimate: fast-forwarding often happens when "you upstream downstream problems with solutions for tracking an upstream repository, you have committed no local changes, and now you want to update to a newer upstream revision.

But in the man page there is a remote repository; there is no remote repository in Chacon's cited example of fast-forwarding, just a couple of locally created branches. Stack Overflow for Teams � Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn. Asked 10 years, 11 months ago. Active 10 months ago. Viewed k times. ThomasMcLeod 6, 4 4 gold badges 37 37 silver badges 71 71 bronze badges. Related: What does 'upstream' mean?

Add a comment. Active Oldest Votes. DilithiumMatrix I would say upstream and downstream are adjectives � Crt Jun 9 '17 at They are adjectives when they are used as modifiers, but those terms are often used as nouns. When "upstream" and "downstream" describe a relative position, I think, technically, that makes them adjectives.

This is just a comment on what I understand, not correcting. MycrofD words can be used as adjectives and nouns depending on the context upstream downstream problems with solutions for reggaeguitar Sep 21 '18 at When you read in git tag man page : One important aspect of git is it is distributed, and being distributed largely means there is no inherent "upstream" or "downstream" in the.

Those notions are always relative between two repos and depends on the way data flows: If "yourRepo" has declared "otherRepo" as a remote one, then : you are pulling from upstream "otherRepo" "otherRepo" is "upstream from you", and you are "downstream for otherRepo". Basically: In term of " flow of data ", your repo is at the bottom "downstream" of a flow coming from upstream repos "pull from" and going back to the same or other upstream repos "push to".

See rev-parse man page : Many git porcelainish commands take mixture of flags i. Abu Nafee Ibna Zahid 1 1 gold badge 5 5 silver badges 17 17 bronze badges. VonC VonC 1. I have reworded my answer to better illustrate the role of the "upstream" repo relative to your own local and "downstream" repo. Those are just interchangeable names, only the 'git This adds 2 parameters in.

Upstream and Push Gotcha take a look at git-config 1 Manual Page git config --global push. Peter Host Peter Host 1, 11 11 silver badges 10 10 bronze badges. Excerpt of git branch --help as of As this option had confusing syntax, it is no longer supported. Please use --track or --set-upstream-to instead. That's a bit of informal terminology. As far upstream downstream problems with solutions for Git is concerned, every other repository is just a remote.

The terms are not restricted to Git repositories. For instance, Ubuntu is a Debian derivative, so Debian is upstream for Ubuntu. Lii 9, 6 upstream downstream problems with solutions for gold badges 53 53 silver badges 73 73 bronze badges. Upstream Called Harmful There is, alas, another use of "upstream" that the other answers here are not getting at, namely to refer to the parent-child relationship of commits within a repo.

Indeed, Chacon himself appears to use "downstream" later to mean exactly the same thing, when he speaks of rewriting all child commits of a deleted commit: You must rewrite all the commits downstream from 6df76 to fully remove this file from your Git history Basically he seems not to have any clear idea what he means by "upstream" and "downstream" when referring to the history of commits over time.

The git-rebase man page also suffers from this overloading: the commit that is checked out before rebasing is termed the "upstream". This, too, may have affected Chacon's usage. Good point. Would be kind of helpful to gather common "git-terminology". Especially for newbies or ppl contributing to git.

Would have saved me good time getting used to the wording of the git man pages. SebNag something like this? Came here from the git-rebase docs because I was totally confused why a commit ref would be called "upstream" there in fact, I was doubting myself as I haven't seen this terminology.

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The person was still alive. But they were struggling to keep their head above water. In that moment, the townspeople sprung into action.

The town rejoiced! Until the following day when the next body appeared in the river. Fortunately, they had a solution to the problem. It took a great amount of effort, but they saved the next victim. As the weeks went on, more and more bodies appeared in the river. Not just one a day, but three�five�ten people who needed saving each day. So Downstream devised more powerful solutions. They built boats and formed a town Coast Guard.

They built a school to teach these coast guards how to navigate the treacherous river waters. They built a new hospital right along the shore to treat the survivors from the river.

The Downstreamers grew proud of their support systems. Sure, they invest a massive amount of resources into these rescue efforts. Why are these bodies in the water in the first place? The symptoms of a challenge are what grab your attention. The source of a challenge is whatever created those symptoms in the first place.

In Downstream, they were great at treating the symptoms of their problem. Bodies in the river. They created robust defense mechanisms to deal with a problem that kept building over time. But they never got to the root cause of their problem. What was causing so many people to fall into the river in the first place?

Was there a bridge in disrepair? Were unaware tourists swimming in an area with fast currents? Downstream could have saved countless resources by first going upstream to understand the source of the problem. After all, the symptoms are what grab your attention in the first place.

Treating symptoms without treating the source is like trying to cool a pot of boiling water by adding ice cubes instead of turning off the burner. In other parts of life, it often takes more consideration and effort to treat the source of a problem. But you reap the benefits of this short-term effort in the long run. If you fail to treat the source for long enough, your symptom treatments might become the source of new problems.

For example, you might have an energy problem, and are feeling symptoms of fatigue and grogginess. So you treat your grogginess by having a couple cups of coffee throughout the day.

But the caffeine stays in your system. And your sleep quality suffers as well. Which makes you feel less grounded and more impulsive�and the spiral continues.

Sometimes, there are many sources to a problem. Other times, a symptom will be multiple steps downstream from the true source.

It reminds me of this example. So they both, without hesitation, jump into the river and they pull this kid out. Of course, they turn around and pull this child out, and then another and another and this keeps going. So guys maybe we have a bit if an upstream problem ourselves. You could easily spend all your time downstream trying to work out how to look after the people but what can you do upstream to stop these things happening?

You would think children drowning would draw you in. All it has to do is deliver a point about something simple that can enter the language of the organisation so it becomes a metaphor for a problem that is happening.

And the young man goes on and on berating the older priest all the way to the monastery about carrying the woman. I touched on it but this idea of why there is this convention�you used it in the priest story�the priests.

Part of not using names is so you can telegraph to your audience that this is not real. So, you move from relaying a parable to lying and that completely removes the impact and reduces your credibility.

Your credibility just goes out the window. So a parable�less than a minute. By the way, the shortest story we looked at was 4 seconds.

It was 7 seconds and gave a good insight into her character. You immediately knew she was a Texan and a bit about her personality. Back to the parable�you asked what I thought of the story. Maybe you will. Probably not a lot. He called it requisite quality: good enough to get the job done.

In the opening, we gave you a pretty good idea of where you would use it. Whenever you see a situation and you want to call it out�this is a nice little story to tell. Given your quality definition, what do you think would be your score out of 10 here?

It falls into a totally different category: parable versus an event. Not a great story but you can get a lot of bang for a very brief period of time. I could see the look of disdain on your face.

I was thinking of my wife and I was imagining that and for some reason, that was easier to tell. In that scenario which one of you would be running upstream? It felt clunky the first time I told it but less clunky the next time. And it reiterates the point we make that you need to practise your stories, tell them out loud and they get better and better. One I heard a while ago that is potentially useful.

Forget that bit.

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