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Add link to issues referenced in nodeaffinity.md and podaffinity.md

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xiangpengzhao 2016-06-28 04:08:11 -04:00
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11
docs/design/nodeaffinity.md
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@ -211,7 +211,7 @@ Users should not start using `NodeAffinity` until the full implementation has
been in Kubelet and the master for enough binary versions that we feel been in Kubelet and the master for enough binary versions that we feel
comfortable that we will not need to roll back either Kubelet or master to a comfortable that we will not need to roll back either Kubelet or master to a
version that does not support them. Longer-term we will use a programatic version that does not support them. Longer-term we will use a programatic
approach to enforcing this (#4855). approach to enforcing this ([#4855](https://github.com/kubernetes/kubernetes/issues/4855)).
## Implementation plan ## Implementation plan
@ -234,7 +234,7 @@ longer satisfies `RequiredDuringSchedulingRequiredDuringExecution` (see [this co
We assume Kubelet publishes labels describing the node's membership in all of We assume Kubelet publishes labels describing the node's membership in all of
the relevant scheduling domains (e.g. node name, rack name, availability zone the relevant scheduling domains (e.g. node name, rack name, availability zone
name, etc.). See #9044. name, etc.). See [#9044](https://github.com/kubernetes/kubernetes/issues/9044).
## Extensibility ## Extensibility
@ -268,10 +268,11 @@ Are there any other fields we should convert from `map[string]string` to
## Related issues ## Related issues
The review for this proposal is in #18261. The review for this proposal is in [#18261](https://github.com/kubernetes/kubernetes/issues/18261).
The main related issue is #341. Issue #367 is also related. Those issues The main related issue is [#341](https://github.com/kubernetes/kubernetes/issues/341).
reference other related issues. Issue [#367](https://github.com/kubernetes/kubernetes/issues/367) is also related.
Those issues reference other related issues.
<!-- BEGIN MUNGE: GENERATED_ANALYTICS --> <!-- BEGIN MUNGE: GENERATED_ANALYTICS -->

47
docs/design/podaffinity.md
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@ -430,8 +430,8 @@ foreach node A of {N}
In this section we discuss three issues with RequiredDuringScheduling In this section we discuss three issues with RequiredDuringScheduling
anti-affinity: Denial of Service (DoS), co-existing with daemons, and anti-affinity: Denial of Service (DoS), co-existing with daemons, and
determining which pod(s) to kill. See issue #18265 for additional discussion of determining which pod(s) to kill. See issue [#18265](https://github.com/kubernetes/kubernetes/issues/18265)
these topics. for additional discussion of these topics.
### Denial of Service ### Denial of Service
@ -501,8 +501,9 @@ A cluster administrator may wish to allow pods that express anti-affinity
against all pods, to nonetheless co-exist with system daemon pods, such as those against all pods, to nonetheless co-exist with system daemon pods, such as those
run by DaemonSet. In principle, we would like the specification for run by DaemonSet. In principle, we would like the specification for
RequiredDuringScheduling inter-pod anti-affinity to allow "toleration" of one or RequiredDuringScheduling inter-pod anti-affinity to allow "toleration" of one or
more other pods (see #18263 for a more detailed explanation of the toleration more other pods (see [#18263](https://github.com/kubernetes/kubernetes/issues/18263)
concept). There are at least two ways to accomplish this: for a more detailed explanation of the toleration concept).
There are at least two ways to accomplish this:
* Scheduler special-cases the namespace(s) where daemons live, in the * Scheduler special-cases the namespace(s) where daemons live, in the
sense that it ignores pods in those namespaces when it is sense that it ignores pods in those namespaces when it is
@ -562,12 +563,12 @@ that trigger killing of P? More generally, how long should the system wait
before declaring that P's affinity is violated? (Of course affinity is expressed before declaring that P's affinity is violated? (Of course affinity is expressed
in terms of label selectors, not for a specific pod, but the scenario is easier in terms of label selectors, not for a specific pod, but the scenario is easier
to describe using a concrete pod.) This is closely related to the concept of to describe using a concrete pod.) This is closely related to the concept of
forgiveness (see issue #1574). In theory we could make this time duration be forgiveness (see issue [#1574](https://github.com/kubernetes/kubernetes/issues/1574)).
configurable by the user on a per-pod basis, but for the first version of this In theory we could make this time duration be configurable by the user on a per-pod
feature we will make it a configurable property of whichever component does the basis, but for the first version of this feature we will make it a configurable
killing and that applies across all pods using the feature. Making it property of whichever component does the killing and that applies across all pods
configurable by the user would require a nontrivial change to the API syntax using the feature. Making it configurable by the user would require a nontrivial
(since the field would only apply to change to the API syntax (since the field would only apply to
RequiredDuringSchedulingRequiredDuringExecution affinity). RequiredDuringSchedulingRequiredDuringExecution affinity).
## Implementation plan ## Implementation plan
@ -602,7 +603,7 @@ Do so in a way that addresses the "determining which pod(s) to kill" issue.
We assume Kubelet publishes labels describing the node's membership in all of We assume Kubelet publishes labels describing the node's membership in all of
the relevant scheduling domains (e.g. node name, rack name, availability zone the relevant scheduling domains (e.g. node name, rack name, availability zone
name, etc.). See #9044. name, etc.). See [#9044](https://github.com/kubernetes/kubernetes/issues/9044).
## Backward compatibility ## Backward compatibility
@ -612,7 +613,7 @@ Users should not start using `Affinity` until the full implementation has been
in Kubelet and the master for enough binary versions that we feel comfortable in Kubelet and the master for enough binary versions that we feel comfortable
that we will not need to roll back either Kubelet or master to a version that that we will not need to roll back either Kubelet or master to a version that
does not support them. Longer-term we will use a programmatic approach to does not support them. Longer-term we will use a programmatic approach to
enforcing this (#4855). enforcing this ([#4855](https://github.com/kubernetes/kubernetes/issues/4855)).
## Extensibility ## Extensibility
@ -673,23 +674,27 @@ pod to name the data rather than the node.
## Related issues ## Related issues
The review for this proposal is in #18265. The review for this proposal is in [#18265](https://github.com/kubernetes/kubernetes/issues/18265).
The topic of affinity/anti-affinity has generated a lot of discussion. The main The topic of affinity/anti-affinity has generated a lot of discussion. The main
issue is #367 but #14484/#14485, #9560, #11369, #14543, #11707, #3945, #341, issue is [#367](https://github.com/kubernetes/kubernetes/issues/367)
but [#14484](https://github.com/kubernetes/kubernetes/issues/14484)/[#14485](https://github.com/kubernetes/kubernetes/issues/14485),
# 1965, and #2906 all have additional discussion and use cases. [#9560](https://github.com/kubernetes/kubernetes/issues/9560), [#11369](https://github.com/kubernetes/kubernetes/issues/11369),
[#14543](https://github.com/kubernetes/kubernetes/issues/14543), [#11707](https://github.com/kubernetes/kubernetes/issues/11707),
[#3945](https://github.com/kubernetes/kubernetes/issues/3945), [#341](https://github.com/kubernetes/kubernetes/issues/341),
[#1965](https://github.com/kubernetes/kubernetes/issues/1965), and [#2906](https://github.com/kubernetes/kubernetes/issues/2906)
all have additional discussion and use cases.
As the examples in this document have demonstrated, topological affinity is very As the examples in this document have demonstrated, topological affinity is very
useful in clusters that are spread across availability zones, e.g. to co-locate useful in clusters that are spread across availability zones, e.g. to co-locate
pods of a service in the same zone to avoid a wide-area network hop, or to pods of a service in the same zone to avoid a wide-area network hop, or to
spread pods across zones for failure tolerance. #17059, #13056, #13063, and spread pods across zones for failure tolerance. [#17059](https://github.com/kubernetes/kubernetes/issues/17059),
[#13056](https://github.com/kubernetes/kubernetes/issues/13056), [#13063](https://github.com/kubernetes/kubernetes/issues/13063),
and [#4235](https://github.com/kubernetes/kubernetes/issues/4235) are relevant.
# 4235 are relevant. Issue [#15675](https://github.com/kubernetes/kubernetes/issues/15675) describes connection affinity, which is vaguely related.
Issue #15675 describes connection affinity, which is vaguely related. This proposal is to satisfy [#14816](https://github.com/kubernetes/kubernetes/issues/14816).
This proposal is to satisfy #14816.
## Related work ## Related work