Improve dist diagnostics #5013
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Improve dist diagnostics #5013
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* Monitor nodes membership in mem3_distribution and log unexpected `nodedown` reasons. * Enhance mem3_distribution gen_sever to keep track of the last few events for each node. This can help detect nodes flapping or disconnecting often. * Expose the last few events from mem3_distribution in the .../_system endpoint, besides the already existing dist packet stats metrics. * Add `ping_nodes(...)` debug function. Use it to ping all connected nodes. This can help detect a still connected but slow network connection. * Add `dead_nodes(...)` debug function. Use it to detect a partitioned cluster, where some nodes may not be connected to each other.
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Monitor nodes membership in mem3_distribution and log unexpected
nodedownreasons.Enhance mem3_distribution gen_sever to keep track of the last few events for each node. This can help detect nodes flapping or disconnecting often.
Expose the last few events from mem3_distribution in the .../_system endpoint, besides the already existing dist packet stats metrics.
Add
ping_nodes(...)debug function. Use it to ping all connected nodes. This can help detect a still connected but slow network connection.Add
dead_nodes(...)debug function. Use it to detect a partitioned cluster, where some nodes may not be connected to each other.