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https://dev.mysql.com/doc/refman/9.7/en/group-replication-fault-tolerance.html
MySQL Group Replication builds on an implementation of the Paxos distributed algorithm to provide distributed coordination between servers. As such, it requires a majority of servers to be active to reach quorum and thus make a decision. This has ...
https://dev.mysql.com/doc/refman/9.7/en/group-replication-network-partitioning.html
The group needs to achieve consensus whenever a change that needs to be replicated happens. This is the case for regular transactions but is also required for group membership changes and some internal messaging that keeps the group consistent.
https://dev.mysql.com/doc/refman/9.7/en/group-replication-performance-xcom-cache-increase.html
If a member is absent for a period that is not long enough for it to be expelled from the group, it can reconnect and start participating in the group again by retrieving missed transactions from another member's XCom message cache. However, if the ...
https://dev.mysql.com/doc/refman/9.7/en/group-replication-primary-election-component.html
On failover, when in single-primary mode, use replication group member most-up-to-date status as a criterion for selection of the new primary. URN: file://component_group_replication_elect_prefers_most_updated Prior to installing the Group ...
https://dev.mysql.com/doc/refman/9.7/en/group-replication-probes-and-statistics.html
The monitoring mechanism works by having each member deploying a set of probes to collect information about its work queues and throughput. It then propagates that information to the group periodically to share that data with the other members.
https://dev.mysql.com/doc/refman/9.7/en/group-replication-responses-failure-partition.html
By default, members that find themselves in a minority due to a network partition do not automatically leave the group. You can use the system variable group_replication_unreachable_majority_timeout to set a number of seconds for a member to wait ...
https://dev.mysql.com/doc/refman/9.7/en/group-replication-single-primary-mode.html
In single-primary mode (group_replication_single_primary_mode=ON) the group has a single primary server that is set to read/write mode. All the other members in the group are set to read-only mode (with super_read_only=ON). All other servers that ...
https://dev.mysql.com/doc/refman/9.7/en/group-replication-summary.html
Group Replication is a technique that can be used to implement fault-tolerant systems. A replication group is a set of servers, each of which has a complete copy of the data (a shared-nothing replication scheme), which interact with each other ...
https://dev.mysql.com/doc/refman/9.7/en/group-replication-understanding-consistency-guarantees.html
In terms of distributed consistency guarantees, either in normal or failure repair operations, Group Replication has always been an eventual consistency system. This means that as soon as the incoming traffic slows down or stops, all group members ...
https://dev.mysql.com/doc/refman/9.7/en/handler.html
HANDLER tbl_name OPEN [ [AS] alias] HANDLER tbl_name READ index_name { = | <= | >= | < | > } (value1,value2,...) [ WHERE where_condition ] [LIMIT ... ] HANDLER tbl_name READ index_name { FIRST | NEXT | PREV | LAST } [ WHERE where_condition ] [LIMIT ...