Backwards compatible replication status to state transition#10167
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deepthi merged 14 commits intovitessio:mainfrom Apr 29, 2022
Merged
Backwards compatible replication status to state transition#10167deepthi merged 14 commits intovitessio:mainfrom
deepthi merged 14 commits intovitessio:mainfrom
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It was NOT backwards compatible. Signed-off-by: Matt Lord <mattalord@gmail.com>
Signed-off-by: Matt Lord <mattalord@gmail.com>
We are only appending the last io_thread_connecting field Signed-off-by: Matt Lord <mattalord@gmail.com>
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Signed-off-by: Matt Lord <mattalord@gmail.com>
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Signed-off-by: Matt Lord <mattalord@gmail.com>
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Signed-off-by: Matt Lord <mattalord@gmail.com>
Signed-off-by: Manan Gupta <manan@planetscale.com>
… compatible Signed-off-by: Manan Gupta <manan@planetscale.com>
… the upgrade Signed-off-by: Manan Gupta <manan@planetscale.com>
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I think this all Looks good now! Maybe it is better we get a review from @deepthi too before merging
Signed-off-by: Manan Gupta <manan@planetscale.com>
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LGTM! Thanks for all the help, @GuptaManan100 ! ❤️ |
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lgtm.
Apologies for missing the compatibility issue on the earlier PR.
| LastSqlError: s.LastSQLError, | ||
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| // We need to be able to send gRPC response messages from v14 and newer tablets to |
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Description
It turns out that this was NOT fully backwards compatible: https://github.com/vitessio/vitess/pull/9853/files
Later ERS related upgrade/downgrade tests added in #10148 showed this. The problem was that a v14
vtctl(client:vtctlclient->vtctldorvtctl) would send an RPC to a v13vttablet(server) and thevttabletwould respond with the v13ReplicationStatusResponsemessage that does not have theIoStatusorSqlStatusfields in it so the v14vtctlwould process that response and consider the IO and SQL statuses as Unknown and be unable to proceed with some actions (such as reparenting). In order to support a v14vtctlwith v13vttablets, when processing the RPC response we need to check for an IO and SQL state of Unknown and revert to using the binary IO and SQL thread running values (the older tablets cannot tell us if the IO state was connecting).In order to support correct RPC communication between v13 and v14 we must also leave the old fields in place so that it's a clean upgrade from v13 to v14 — and the v14
vtctlwill process the olderio_thread_runningandsql_thread_runningReplicationStatusResponsefields — while adding the new fields for v14+vttabletsand clients to use. This way in v15+ we can remove the old fields and complete the transition for smooth upgrades.Related Issue(s)
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