binlog loop back sync #884
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allow when the column number of downstream table mismatch with current schema. For the case bidirectional replication, we will execute the DDL at one side, for add or drop column the column number will mismatch. cluster A <-> cluster B drop column of table t at cluster A some DML of table t at cluster B will miss the column dropped compared to cluster A
In the AA dual activity scenario, there is data write (DML) on both sides. The data of tidb cluster on both sides needs to be synchronized with each other，but avoid loopback synchronization，and ddl is only writed one side. add three variables in drainer.toml as identification to confirm need sync ddl or not and need set sync mark identification or not and sync identification id to Avoid loopback synchronization add configuration item loopback-control (true/false) set mark table identification or not and filter txn by mark table ddl-sync (true/false) sync ddl to downstream DB or not channel-id (integer) sync identification id，avoid loopback synchronization Co-authored-by: Nihao123451 <37206498+Nihao123451@users.noreply.github.com>
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/run-all-tests |
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@suzaku @freemindLi PTAL |
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/run-all-tests |
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LGTM |
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What problem does this PR solve?
cherry pick #879 #867
What is changed and how it works?
cherry pick #879 #867
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