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Fix: Errant GTID detection on the replicas when they set replication source #16833

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@GuptaManan100 GuptaManan100 commented Sep 24, 2024

Description

This PR adds errant GTID detection logic in setReplicationSourceLocked call. The intent is that we want to prevent any replica that has an errant GTID from even joining the replication stream. This is because we want to prevent this replica from sending semi-sync ACKs, which can land us into some really annoying and hard to deal with situations.

To do the errant GTID detection, the tablets first query their own position and then ask the primary for its position. Then they compare the two to see if they have an errant GTID or not. If they do, they fail the RPC without setting the new source.

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  • "Backport to:" labels have been added if this change should be back-ported to release branches
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vitess-bot bot commented Sep 24, 2024

Review Checklist

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@vitess-bot vitess-bot bot added NeedsBackportReason If backport labels have been applied to a PR, a justification is required NeedsDescriptionUpdate The description is not clear or comprehensive enough, and needs work NeedsIssue A linked issue is missing for this Pull Request NeedsWebsiteDocsUpdate What it says labels Sep 24, 2024
@github-actions github-actions bot added this to the v21.0.0 milestone Sep 24, 2024
@GuptaManan100 GuptaManan100 added Type: Enhancement Logical improvement (somewhere between a bug and feature) Component: Cluster management and removed NeedsDescriptionUpdate The description is not clear or comprehensive enough, and needs work NeedsWebsiteDocsUpdate What it says NeedsIssue A linked issue is missing for this Pull Request NeedsBackportReason If backport labels have been applied to a PR, a justification is required labels Sep 26, 2024
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codecov bot commented Sep 26, 2024

Codecov Report

Attention: Patch coverage is 56.89655% with 25 lines in your changes missing coverage. Please review.

Project coverage is 69.45%. Comparing base (969e018) to head (b2e5b20).
Report is 6 commits behind head on main.

Files with missing lines Patch % Lines
go/vt/vttablet/tabletmanager/rpc_replication.go 0.00% 13 Missing ⚠️
go/vt/vttablet/tabletmanager/tm_init.go 65.21% 8 Missing ⚠️
go/vt/vttablet/tabletmanager/restore.go 0.00% 4 Missing ⚠️
Additional details and impacted files
@@            Coverage Diff             @@
##             main   #16833      +/-   ##
==========================================
+ Coverage   69.41%   69.45%   +0.03%     
==========================================
  Files        1570     1571       +1     
  Lines      202945   203033      +88     
==========================================
+ Hits       140880   141020     +140     
+ Misses      62065    62013      -52     

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