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The replication thread delay in milliseconds on a replica server if innodb_thread_concurrency  is reached. 

• innodb_rollback_on_timeout 

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InnoDB  rolls back only the last statement on a transaction timeout by default. If --innodb-rollback- on-timeout  is specified, a transaction timeout causes InnoDB  to abort and roll back the entire transaction. 

For more information, see Section 15.21.4, “InnoDB Error Handling” . 

• innodb_rollback_segments 

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innodb_rollback_segments  defines the number of rollback segments allocated to each undo tablespace and the global temporary tablespace for transactions that generate undo records. The number of transactions that each rollback segment supports depends on the InnoDB  page size and the number of undo logs assigned to each transaction. For more information, see Section 15.6.6, “Undo Logs” . 

For related information, see Section 15.3, “InnoDB Multi-Versioning” . For information about undo tablespaces, see Section 15.6.3.4, “Undo Tablespaces” . 

• innodb_saved_page_number_debug 

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