replica connected, and configured correctly to send semi-sync ACKs. Vitess configures the semi-sync timeout to essentially an unlimited number so that it will never fallback to asyncronous replication. This lock, and an ephemeral file in that subdirectory (it is associated with a lease, whose TTL can be set with the -topo_etcd_lease_duration flag, defaults to 30 seconds). The ephemeral file with the lowest The usual default values of MySQL are sufficient. However, it is important to verify that the wait_timeout (28800) has not been changed. If this value was changed to be too short, then MySQL could prematurely

ate NoOp query_prealloc_size NoOp sql_buffer_result NoOp transaction_alloc_block_size NoOp wait_timeout NoOp 22 System variable Handled audit_log_read_buffer_size NotSupported auto_increment_increment div_precision_increment CheckAndIgnore innodb_lock_wait_timeout CheckAndIgnore interactive_timeout CheckAndIgnore lc_time_names CheckAndIgnore lock_wait_timeout CheckAndIgnore max_allowed_packet CheckAndIgnore max_sort_length CheckAndIgnore max_user_connections CheckAndIgnore net_read_timeout CheckAndIgnore net_retry_count CheckAndIgnore net_write_timeout CheckAndIgnore session_track_gtids CheckAndIgnore session_track_schema”

The two parameters are set to 0 by default. raftstore.raft-min-election-timeout-ticks: 1000 raftstore.raft-max-election-timeout-ticks: 1020 PD parameters • The PD metadata information records the topology are evicted before stopping the instance. The default timeout time is 5 minutes (300 seconds). The instance is directly stopped after this timeout time. • To perform the upgrade immediately without evicting stance are evicted before stopping the instance. You can set --transfer �→ -timeout to a larger value, for example, --transfer-timeout 3600 (unit: second). Offline upgrade 1. Before the offline upgrade, you

snapshot files when snapshot files cannot be garbage collected #10813 – Fix a panic issue caused by timeout when processing Coprocessor requests #10852 – Fix a memory leak caused by monitoring data of statistics of library nsl – Block the infinite wait of wait index when writing pressure is heavy (a default timeout of 5 minutes is added), which prevents TiFlash from waiting too long for data replication to provide of connection attempts 60 �→ exceeds the value, the backend server is considered unavailable. timeout connect 2s # The maximum time to wait for a �→ connection attempt to a backend server to succeed

the interval of the inspection. If the latency exceeds this value, this inspection is marked as timeout. The default value is 500ms. 32 Configuration file Configuration item Change type Description �→ duration �→ Modified Indicates the longest inactive duration allowed for a peer. A peer with timeout is marked as down, and PD tries to delete it later. The default value is changed from 5m to 10m. The two parameters are set to 0 by default. raftstore.raft-min-election-timeout-ticks: 1000 raftstore.raft-max-election-timeout-ticks: 1020 PD parameters • The PD metadata information records the topology

ate NoOp query_prealloc_size NoOp sql_buffer_result NoOp transaction_alloc_block_size NoOp wait_timeout NoOp audit_log_read_buffer_size NotSupported auto_increment_increment NotSupported auto_increment_offset div_precision_increment CheckAndIgnore innodb_lock_wait_timeout CheckAndIgnore interactive_timeout CheckAndIgnore lc_time_names CheckAndIgnore lock_wait_timeout CheckAndIgnore max_allowed_packet CheckAndIgnore max_sort_length CheckAndIgnore max_user_connections CheckAndIgnore net_read_timeout CheckAndIgnore net_retry_count CheckAndIgnore net_write_timeout CheckAndIgnore session_track_gtids CheckAndIgnore session_track_schema”

ate NoOp query_prealloc_size NoOp sql_buffer_result NoOp transaction_alloc_block_size NoOp wait_timeout NoOp audit_log_read_buffer_size NotSupported auto_increment_increment NotSupported auto_increment_offset CheckAndIgnore innodb_lock_wait_timeout CheckAndIgnore interactive_timeout CheckAndIgnore lc_time_names CheckAndIgnore 25 System variable Handled lock_wait_timeout CheckAndIgnore max_allowed_packet max_sort_length CheckAndIgnore max_user_connections CheckAndIgnore net_read_timeout CheckAndIgnore net_retry_count CheckAndIgnore net_write_timeout CheckAndIgnore session_track_gtids CheckAndIgnore session_track_schema”

ate NoOp query_prealloc_size NoOp sql_buffer_result NoOp transaction_alloc_block_size NoOp wait_timeout NoOp audit_log_read_buffer_size NotSupported auto_increment_increment NotSupported auto_increment_offset div_precision_increment CheckAndIgnore innodb_lock_wait_timeout CheckAndIgnore interactive_timeout CheckAndIgnore lc_time_names CheckAndIgnore lock_wait_timeout CheckAndIgnore max_allowed_packet CheckAndIgnore max_sort_length CheckAndIgnore max_user_connections CheckAndIgnore net_read_timeout CheckAndIgnore net_retry_count CheckAndIgnore net_write_timeout CheckAndIgnore session_track_gtids CheckAndIgnore session_track_schema”

number of connection attempts �→ exceeds the value, the backend server is considered unavailable. timeout connect 2s # The maximum time to wait for a �→ connection attempt to a backend server to succeed if the server is located on the same LAN as �→ HAProxy. timeout client 30000s # The maximum inactivity time on the �→ client side. timeout server 30000s # The maximum inactivity time on the �→ server number of connection attempts �→ exceeds the value, the backend server is considered unavailable. timeout connect 2s # The maximum time to wait for a �→ connection attempt to a backend server to succeed

statistics before timeout. 33 Variable name Change type Description tidb_stats_load_pseudo_timeout �→ Newly added Controls when syn- chronously loading statistics reaches timeout, whether SQL fails PREDICATE COLUMNS information to the mysql. �→ column_stats_usage system table every 100 * stats-lease. When the query pat- tern of your business is stable, you can use the ANALYZE TABLE TableName PREDICATE #1798 * Fix the issue of replication stop caused by the incorrect configuration of config.Metadata.Timeout #3352 – TiDB Data Migration (DM) * Fix the issue that the CREATE VIEW statement interrupts data