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typo fixes

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Anthony Elizondo 2016-09-19 16:21:58 -04:00 committed by GitHub
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docs/proposals/federation.md
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@ -295,7 +295,7 @@ initial implementation targeting single cloud provider only.
Up to this point, this use case ("Unavailability Zones") seems materially different from all the others above. It does not require dynamic cross-cluster service migration (we assume that the service is already running in more than one cluster when the failure occurs). Nor does it necessarily involve cross-cluster service discovery or location affinity. As a result, I propose that we address this use case somewhat independently of the others (although I strongly suspect that it will become substantially easier once we've solved the others). Up to this point, this use case ("Unavailability Zones") seems materially different from all the others above. It does not require dynamic cross-cluster service migration (we assume that the service is already running in more than one cluster when the failure occurs). Nor does it necessarily involve cross-cluster service discovery or location affinity. As a result, I propose that we address this use case somewhat independently of the others (although I strongly suspect that it will become substantially easier once we've solved the others).
All of the above (regarding "Unavailibility Zones") refers primarily All of the above (regarding "Unavailability Zones") refers primarily
to already-running user-facing services, and minimizing the impact on to already-running user-facing services, and minimizing the impact on
end users of those services becoming unavailable in a given cluster. end users of those services becoming unavailable in a given cluster.
What about the people and systems that deploy Kubernetes services What about the people and systems that deploy Kubernetes services
@ -324,7 +324,7 @@ other stateful network service. What is tolerable is typically
application-dependent, primarily influenced by network bandwidth application-dependent, primarily influenced by network bandwidth
consumption, latency requirements and cost sensitivity. consumption, latency requirements and cost sensitivity.
For simplicity, lets assume that all Kubernetes distributed For simplicity, let's assume that all Kubernetes distributed
applications fall into one of three categories with respect to relative applications fall into one of three categories with respect to relative
location affinity: location affinity:
@ -361,7 +361,7 @@ location affinity:
anyway to run effectively, even in a single Kubernetes cluster). anyway to run effectively, even in a single Kubernetes cluster).
From a fault isolation point of view, there are also opposites of the From a fault isolation point of view, there are also opposites of the
above. For example a master database and it's slave replica might above. For example, a master database and its slave replica might
need to be in different availability zones. We'll refer to this a need to be in different availability zones. We'll refer to this a
anti-affinity, although it is largely outside the scope of this anti-affinity, although it is largely outside the scope of this
document. document.
@ -463,7 +463,7 @@ such events include:
1. A low capacity event in a cluster (or a cluster failure). 1. A low capacity event in a cluster (or a cluster failure).
1. A change of scheduling policy ("we no longer use cloud provider X"). 1. A change of scheduling policy ("we no longer use cloud provider X").
1. A change of resource pricing ("cloud provider Y dropped their 1. A change of resource pricing ("cloud provider Y dropped their
prices - lets migrate there"). prices - let's migrate there").
Strictly Decoupled applications can be trivially moved, in part or in Strictly Decoupled applications can be trivially moved, in part or in
whole, one pod at a time, to one or more clusters (within applicable whole, one pod at a time, to one or more clusters (within applicable
@ -569,7 +569,7 @@ prefers the Decoupled Hierarchical model for the reasons stated below).
single Monolithic multi-zone cluster might be simpler by virtue of single Monolithic multi-zone cluster might be simpler by virtue of
being only "one thing to manage", however in practise each of the being only "one thing to manage", however in practise each of the
underlying availability zones (and possibly cloud providers) has underlying availability zones (and possibly cloud providers) has
it's own capacity, pricing, hardware platforms, and possibly its own capacity, pricing, hardware platforms, and possibly
bureaucratic boundaries (e.g. "our EMEA IT department manages those bureaucratic boundaries (e.g. "our EMEA IT department manages those
European clusters"). So explicitly allowing for (but not European clusters"). So explicitly allowing for (but not
mandating) completely independent administration of each mandating) completely independent administration of each