Add realtime health stats to vtctld /api/keyspace/ks/tablets API #6569
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Signed-off-by: Tim Vaillancourt <timvaillancourt@github.com>
Signed-off-by: Tim Vaillancourt <timvaillancourt@github.com>
Signed-off-by: Tim Vaillancourt <timvaillancourt@github.com>
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Signed-off-by: Tim Vaillancourt <timvaillancourt@github.com>
deepthi
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Signed-off-by: Tim Vaillancourt <timvaillancourt@github.com>
@deepthi thanks for the review 🙇 |
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(A continuation of #6524, abandoned due to
git rebaseissues 🤞)This PR adds realtime health stats to the vtctld
/api/keyspace/<ks>/tablets/<shard>HTTP API endpoint. This extends the PR @shlomi-noach made in #4232The tablet health metrics are needed for
github.com/github/frenoto understand if avttabletis ready for probes for replication lag. In today's implementation that looks for any tablet-type ==REPLICAit is possible for an unhealthyvttablet(replication isSTOP SLAVE'd, mysqld crashed, etc) to continue to be probed by Freno because it is unable to detect tablet health from the current API endpointThis PR also adds a
cellandcells(CSV list) query parameter for filtering the output by Vitess Cell. Let me know if you'd prefer this to be part of the URL path vs a query param. This is useful when you're only interested in grabbing specific cellsExample
GETcalls:GET /api/keyspace/<ks>/tablets/?cell=cell1GET /api/keyspace/<ks>/tablets/?cells=cell1,cell2GET /api/keyspace/<ks>/tablets/<shard>?cell=cell1GET /api/keyspace/<ks>/tablets/<shard>?cells=cell1,cell2Lastly, this PR adds unit tests for
GET /api/keyspace/<ks>/tablets/I've made this a work in progress PR for @sougou / @shlomi-noach / @deepthi to review. After we agree on the approach I can complete the unit testing, add suggestions, etccc @sougou / @shlomi-noach / @deepthi / @tomkrouper / @drogart