Log when DB queries return large numbers of rows #2338
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@andy-paine thanks for the PR. Is there an associated capi-release PR to allow configuration of the |
Co-authored-by: andy-paine <andy.paine@engineerbetter.com>
Threshold acts as both a way to avoid polluting logs with queries that only produce a few rows as well as a way to toggle this behaviour off so it only affects users who opt-in
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Allow configuring of the threshold above which large queries should be logged See cloudfoundry/cloud_controller_ng#2338
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Rebased this branch and added a CAPI PR cloudfoundry/capi-release#200 now 🙂 |
Ensure that extra logs will only be emitted when user opts in by providing threshold
The format of these logs is slightly different between mysql and postgres but they seem functionally the same so we can just test for either type of quoting
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A short explanation of the proposed change
Add some extra logging for when DB queries return a large number of rows including a configuration flag which can both toggle the feature off as well as set a threshold for when to log.
An explanation of the use cases your change solves
We've seen some DB queries return large numbers of rows which CC then has to parse/marshal which can be particularly slow. By adding some additional logging when queries return lots of data we can hopefully identify specific requests that cause large numbers or rows to be handled.
We've also looked at using pg_stat_statments but by using the existing Steno logger in CC we can identify a specific request as our users submit error reports about slow endpoints including the VCAP request ID.
Links to any other associated PRs
Slow service plan visibilities caused by large numbers of returned rows - #2215
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