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TiCDC Glossary

This glossary provides TiCDC-related terms and definitions. These terms appears in TiCDC logs, monitoring metrics, configurations, and documents.

For TiDB-related terms and definitions, refer to TiDB glossary.

C

Capture

A single TiCDC instance on which the replication task of the cluster runs. Multiple captures form a TiCDC cluster.

Changed data

The data to be written to TiCDC from the upstream TiDB cluster, including the DML-caused data changes and the DDL-caused table schema changes.

Changefeed

An incremental replication task in TiCDC, which outputs the data change logs of several tables in a TiDB cluster to the designated downstream.

O

Owner

A capture of a special role that manages the TiCDC cluster and schedules replication tasks of the cluster. An owner is elected by captures and there is at most one owner at any time.

P

Processor

TiCDC replication tasks allocate data tables on TiCDC instances, and the processor refers to the replication processing unit of these tables. Processor tasks include pulling, sorting, restoring, and distributing changed data.