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bgrant0607's profile
Brian Grant
Brian Grant
Brian Grant
@bgrant0607

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Brian Grant

@bgrant0607

Google Cloud. Kubernetes Steering Committee emeritus, K8s SIG Architecture co-Chair emeritus, CNCF TOC member emeritus

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github.com/bgrant0607
Joined June 2014

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    1. Brian Grant‏ @bgrant0607 28 Mar 2019
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      Kubernetes Borg/Omega history topic 5: Asynchronous controllers. Borgmaster had synchronous, transactional, edge-triggered state machines. We had challenges scaling, evolving, and extending them.

      4 replies 23 retweets 71 likes
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    2. Brian Grant‏ @bgrant0607 28 Mar 2019
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      High-cardinality resource instances could exceed what could be done in a single transaction. Addition of new states broke clients. Unobserved changes could cause unexpected state transitions. Adding new resource types was hard, and would have had to be added to monolithic files.

      1 reply 0 retweets 3 likes
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    3. Brian Grant‏ @bgrant0607 28 Mar 2019
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      As a result, when new teams worked on new functionality, such as batch scheduling and autoscaling, they built it into external components, which were asynchronous. Ingestion of status from nodes (Borglets) was asynchronous, as well. Omega embraced asynchronous controllers

      1 reply 0 retweets 2 likes
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    4. Brian Grant‏ @bgrant0607 28 Mar 2019
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      Omega represented desired state and observed state in separate records in its transactional Paxos store. This made it harder to assemble a picture of what was going on. In Kubernetes, we decided to represent status in the same object as spec, in v1beta3:http://issues.k8s.io/1225 

      3 replies 0 retweets 5 likes
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    5. Jimmy Zelinskie‏ @jimmyzelinskie 28 Mar 2019
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      Replying to @bgrant0607

      It's represented as the same object, but Status is a subresource (with its own storage in etcd) is it not?

      1 reply 0 retweets 0 likes
      Brian Grant‏ @bgrant0607 28 Mar 2019
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      Replying to @jimmyzelinskie

      It is a subresource, to prevent spec and status changes from accidentally stepping on each other and to enable distinct ACLs, but they don't have separate storage yet. Updating 2 resources in etcd2 (e.g. BoundPod) was painful.http://issues.k8s.io/8625 

      9:00 PM - 28 Mar 2019
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