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Support polling specific Vitess cells#124

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timvaillancourt merged 11 commits intomasterfrom
vitess-cell-support
Jul 23, 2020
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Support polling specific Vitess cells#124
timvaillancourt merged 11 commits intomasterfrom
vitess-cell-support

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@timvaillancourt timvaillancourt commented Jul 20, 2020

This PR adds support for polling MySQL replicas from a specific Vitess "cell"

This change is backwards compatible with the current logic that fetches replicas from any Vitess cell. This change resolves duplicated Freno probing when Freno is deployed with a share domain and many Vitess cells

@timvaillancourt timvaillancourt requested a review from gtowey July 20, 2020 14:58
drogart
drogart approved these changes Jul 20, 2020
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Can't really comment on the go lang, but at a high level this change seems fine. Should bring vitess behavior into parity with non-vitess ways of checking health. Thanks!

shlomi-noach
shlomi-noach approved these changes Jul 20, 2020
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makes sense on the vitess side of things. Also, hello!

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timvaillancourt commented Jul 20, 2020

makes sense on the vitess side of things. Also, hello!

Thanks for the review @shlomi-noach 👋

@timvaillancourt timvaillancourt temporarily deployed to production July 20, 2020 15:52 Inactive
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timvaillancourt commented Jul 20, 2020 •
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@shlomi-noach / @drogart / @tomkrouper: can anyone foresee a need for a single Freno leader to poll more than one Vitess cell?

If so I might make the new config field Cells/VitessCells (an array) vs Cell/VitessCell (a string)

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shlomi-noach commented Jul 21, 2020

@shlomi-noach / @drogart / @tomkrouper: can anyone foresee a need for a single Freno leader to poll more than one Vitess cell?

I think the answer lies within your specific deployment layout. Will you always have a freno representative in every vitess cell (that you care about)? Could there be a situation where one freno needs to "adopt" an experimental new cell (e.g. cloud)?

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timvaillancourt commented Jul 21, 2020

@shlomi-noach / @drogart / @tomkrouper: can anyone foresee a need for a single Freno leader to poll more than one Vitess cell?

I think the answer lies within your specific deployment layout. Will you always have a freno representative in every vitess cell (that you care about)? Could there be a situation where one freno needs to "adopt" an experimental new cell (e.g. cloud)?

Agreed, thanks @shlomi-noach! For our use case there will probably always be 1 x Freno leader per Vitess cell, but I suppose making the setting more flexible now is better than later

I'll update this PR to accept an array/slice of cells to poll in case this is useful for someone 👍

@timvaillancourt timvaillancourt changed the title Support polling a specific Vitess cell Support polling specific Vitess cells Jul 21, 2020
@timvaillancourt timvaillancourt temporarily deployed to staging July 21, 2020 17:01 Inactive
@timvaillancourt timvaillancourt temporarily deployed to staging July 22, 2020 15:39 Inactive
@timvaillancourt timvaillancourt temporarily deployed to staging July 22, 2020 18:33 Inactive
@timvaillancourt timvaillancourt temporarily deployed to staging July 23, 2020 09:02 Inactive
@timvaillancourt timvaillancourt deployed to production/role=mysqlutil&site=ac4-iad&environment=production July 23, 2020 10:15 Active
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@timvaillancourt timvaillancourt merged commit b497e3d into master Jul 23, 2020
@timvaillancourt timvaillancourt deleted the vitess-cell-support branch July 23, 2020 10:22
@timvaillancourt timvaillancourt mentioned this pull request Aug 1, 2020
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@timvaillancourt timvaillancourt mentioned this pull request Aug 14, 2020
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@drogart drogart drogart approved these changes

@gtowey gtowey Awaiting requested review from gtowey

@tomkrouper tomkrouper Awaiting requested review from tomkrouper

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@shlomi-noach shlomi-noach shlomi-noach approved these changes

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