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This page is woefully out of date. There is an ongoing discussion to either remove this page altogether or commit to better maintenance, but for right now it's probably better to add the note than not.
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| ### Fault tolerance demo | ||
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| CockroachDB {{ site.data.products.advanced }} includes a [built-in fault tolerance demo]({% link {{ page.version.version }}/demo-cockroachdb-resilience.md %}#run-a-guided-demo-in-cockroachdb-cloud) that allows you to monitor query execution during a simulated failure and recovery. The fault tolerance demo is in Preview. |
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I noticed that "is in Preview" is similar to a line in the Folders section below but preview is not capitalized there. Also, should add the link? ({% link {{ page.version.version }}/cockroachdb-feature-availability.md %})
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| This page guides you through a simple demonstration of how CockroachDB remains available during, and recovers after, failure. Starting with a 6-node local cluster with the default 3-way replication, you'll run a sample workload, terminate a node to simulate failure, and see how the cluster continues uninterrupted. You'll then leave that node offline for long enough to watch the cluster repair itself by re-replicating missing data to other nodes. You'll then prepare the cluster for 2 simultaneous node failures by increasing to 5-way replication, then take two nodes offline at the same time, and again see how the cluster continues uninterrupted. | ||
| This page describes how to see a hands-on demonstration of how CockroachDB's fault-tolerant design allows services to remain available during a failure and recovery. |
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super nit: Multiple uses of "how" close together sounds a bit awkward here. How to see ... how . I don't have any suggestions for improvements however
| CockroachDB {{ site.data.products.cloud }} {{ site.data.products.advanced }} includes a built-in fault tolerance demo in the {{ site.data.products.cloud }} Console that automatically runs a sample workload and simulates a node failure on your cluster, showing real-time metrics of query latency and failure rate during the outage and recovery. | ||
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| {{ site.data.alerts.callout_info }} | ||
| The CockroachDB {{ site.data.products.cloud }} fault tolerance demo is in [Preview]({% link {{ page.version.version }}/cockroachdb-feature-availability.md %}). |
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Not for this PR but it seems like we should have prebuilt macros for each of visibilities. Its annoying that we'd have to add the version and availability to each place we use this. Ideally we could do this and have it link up correctly.
fault tolerance demo is in {{site.data.visibility.preview}}.
| - A [CockroachDB {{ site.data.products.advanced }} cluster]({% link cockroachcloud/create-an-advanced-cluster.md %}) with at least three nodes. | ||
| - All nodes are healthy. | ||
| - The cluster's CPU utilization is below 30%. | ||
| - The cluster does not a custom [replication zone configuration]({% link {{ page.version.version }}/configure-replication-zones.md %}). |
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We dropped this one.
There are some others but I don't think most of them are worth listing.
The one additional that I think we should consider is around the cluster being in an unlocked state. For example if they are already undergoing cluster disruption or they are scaling their cluster or the cluster is under maintenance, they won't be able to run the demo. Anything that has locked the cluster will prevent the demo from starting. The messaging we show the user in this case is:
The fault tolerance demo cannot be run because this cluster is currently in a locked state. Try again once the cluster is available.
| - The cluster's CPU utilization is below 30%. | ||
| - The cluster does not a custom [replication zone configuration]({% link {{ page.version.version }}/configure-replication-zones.md %}). | ||
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| To run the fault tolerance demo, open the {{ site.data.products.cloud }} Console and navigate to **Actions > Fault tolerance demo**. Follow the prompts to check that your cluster is eligible and begin the demo. |
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Follow the prompts to check that your cluster is eligible
I wonder if this will be confusing? There aren't really any visible prompts to check eligibility since we run them automatically when you try to start the demo.
| To start using your CockroachDB {{ site.data.products.advanced }} cluster, refer to: | ||
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| - [Connect to your cluster]({% link cockroachcloud/connect-to-your-cluster.md %}) | ||
| - Run the [fault tolerance demo]({% link {{ site.versions["stable"] }}/demo-cockroachdb-resilience.md %}#run-a-guided-demo-in-cockroachdb-cloud) |
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I noticed that the headline that results in this page anchor is using the macro {{ site.data.products.cloud }} but it's hard coded here in the anchor. It means that if we ever changed cloud, the anchor would break. This is obviously unlikely and perhaps we'd check by some automated link scanner but it suggests that the current system for linking we have within pages is lacking. It would be better if we had some layer of indirection for each headline that would allow us to change its name without changing it's id. Then we use the id to look up the current name and generate the anchor on the fly. Obviously we wouldn't do any of that in this PR. Just food for thought.
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https://cockroachlabs.atlassian.net/browse/DOC-11437