a system variable, the user connection will be marked as needing reserved connections, and for all sub-sequent calls to Vitess, connection pooling is turned off for this particular session. This only applies to a registered flavor implementation. This approach will retain backward compatibility. • Track sub-flavor: Since we want to support file:position based tracking even if GTID is turned on, we need the requests have been popping up that will benefit from multiple instances of Tablet- Server (or its sub-components) co-existing within the same process. The following features drive this refactor, in order

a system variable, the user connection will be marked as needing reserved connections, and for all sub-sequent calls to Vitess, connection pooling is turned off for this particular session. This only applies to a registered flavor implementation. This approach will retain backward compatibility. • Track sub-flavor: Since we want to support file:position based tracking even if GTID is turned on, we need the requests have been popping up that will benefit from multiple instances of Tablet- Server (or its sub-components) co-existing within the same process. The following features drive this refactor, in order

to a registered flavor implementation. This approach will retain backward compatibility. • Track sub-flavor: Since we want to support file:position based tracking even if GTID is turned on, we need the requests have been popping up that will benefit from multiple instances of Tablet- Server (or its sub-components) co-existing within the same process. The following features drive this refactor, in order QueryService. All those places can now explore the benefit of instantiating a TabletServer or its sub-components. Features This section describes the use cases and their features. An important prerequisite:

that. 49 Who runs the migration Some migrations are executed by the scheduler itself, some by a sub-process, and some implicitly by vreplication, as follows: • CREATE TABLE migrations are executed by a system variable, the user connection will be marked as needing reserved connections, and for all sub-sequent calls to Vitess, connection pooling is turned off for this particular session. This only applies to a registered flavor implementation. This approach will retain backward compatibility. • Track sub-flavor: Since we want to support file:position based tracking even if GTID is turned on, we need the

distributed one in each cell. The local cells typically have 3 or 5 servers, in different server racks / sub-networks for higher resilience. For our integration tests, we use a single ZK server that serves both We use the following paths for Zookeeper specific data, in addition to the regular files: • Locks sub-directory: locks/ (for instance: keyspaces//Keyspace/locks/ for a keyspace) • Master election individual caller process is: – It contains more information about the caller: principal, component, sub-component. – It is provided by the application layer. – It is not authenticated. – It is exposed in

distributed one in each cell. The local cells typically have 3 or 5 servers, in different server racks / sub-networks for higher resilience. For our integration tests, we use a single ZK server that serves both We use the following paths for Zookeeper specific data, in addition to the regular files: • Locks sub-directory: locks/ (for instance: keyspaces//Keyspace/locks/ for a keyspace) • Master election individual caller process is: – It contains more information about the caller: principal, component, sub-component. – It is provided by the application layer. – It is not authenticated. – It is exposed in

to break down their tasks into small sub-tasks. For example, instead of deleting 1,000,000 rows, an application should only delete 50 at a time. Between these sub-tasks, the application should check in distributed one in each cell. The local cells typically have 3 or 5 servers, in different server racks / sub-networks for higher resilience. For our integration tests, we use a single ZK server that serves both We use the following paths for Zookeeper specific data, in addition to the regular files: • Locks sub-directory: locks/ (for instance: keyspaces//Keyspace/locks/ for a keyspace) • Master election

distributed one in each cell. The local cells typically have 3 or 5 servers, in different server racks / sub-networks for higher resilience. For our integration tests, we use a single ZK server that serves both We use the following paths for Zookeeper specific data, in addition to the regular files: • Locks sub-directory: locks/ (for instance: keyspaces//Keyspace/locks/ for a keyspace) • Master election individual caller process is: – It contains more information about the caller: principal, component, sub-component. – It is provided by the application layer. – It is not authenticated. – It is exposed in