csi: retry controller client RPCs on next controller #8561
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tgross
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The documentation encourages operators to run multiple controller plugin instances for HA, but the client RPCs don't take advantage of this by retrying when the RPC fails in cases when the plugin is unavailable (because the node has drained or the alloc has failed but we haven't received an updated fingerprint yet). This changeset tries all known controllers on ready nodes before giving up, and adds tests that exercise the client RPC routing and retries.
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langmartin
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Aug 6, 2020
| return nil, fmt.Errorf("failed to find clients running controller plugin %q", pluginID) | ||
| } | ||
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| rand.Shuffle(len(clientIDs), func(i, j int) { |
This was referenced Aug 7, 2020
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Part of a fix for #8080, #8100, #8232 as summarized in #8232 (comment). Will help mitigate #8285, #8145, #8057. (1 of 4 PRs)
The documentation encourages operators to run multiple controller plugin
instances for HA, but the client RPCs don't take advantage of this by retrying
when the RPC fails in cases when the plugin is unavailable (because the node
has drained or the alloc has failed but we haven't received an updated
fingerprint yet).
This changeset tries all known controllers before giving up, and adds tests
that exercise the client RPC routing and retries.