Redis
| Function | Description |
|---|---|
Full Data Migration and Incremental Data Sync | Synchronize data by executing the PSYNC command, with optional historical data initialization. |
Position Resetting | Initialize historical data again by modifying the position. |
Supported Deployment | Support single node, Sentinel, and Redis sharded cluster. |
Supported Commands | Currently support the following commands (continuously expanding):
|
Advanced Functions
| Function | Description |
|---|---|
Cache Expiration Time | Allow setting the cache expiration time (in seconds) for data after it is written to Redis. |
Bidirectional Redis Synchronization | Support full data migration and incremental data synchronization in which the circular data replication is prevented. See Redis Bidirectional Data Synchronization. |
Supported Commands for Redis Bidirectional Synchronization | Currently, the following commands are supported in bidirectional synchronization (continuously expanding):
|
Limits
| Limit | Description |
|---|---|
Failover Compatibility | Redis 3.x, due to its use of an earlier version of PSYNC, has poor failover compatibility and carries a risk of data loss. |
Replication Backlog Configuration | The default Redis replication parameter repl-backlog-size is too small. If there is significant data synchronization latency, it may trigger a FULL SYNC for full initialization. It is recommended to increase the value of this parameter. |
Prerequisites
| Prerequisite | Description |
|---|---|
Command Preparation | The PSYNC command can be executed (may not be supported by managed cloud services). |
Port Preparation | Allow the migration and sync node (Worker) to connect to the Redis port and Sentinel port (if available). |
Parameters
| Parameter | Description |
|---|---|
dbHeartbeatIntervalSec | Interval for sending the PING command. |
deCycle | Enable event filtering in bidirectional data synchronization, which filters out the specific events to prevent circular data replication in the Incremental stage. |
deCycleMode | Bidirectional data synchronization event filter modes: GET_KEY represents query marking mode, and DEL_KEY represents delete marking mode. |
enableDbMapping | Enable Redis DB mapping. Make sure that the number of DBs in the source and target instances are equal. |
deCycleEventExpireSec | Expiration time for the specific events to prevent circular data replication written to the target instance; <0 means the events won‘t expired. |
extractorQueueSize | Queue size for temporarily stored Redis events. |
inputStreamBufferSize | Buffer size of byte streams for receiving Redis response. |
connAndSoTimeoutMs | TCP connection parameter SO_TIMEOUT. |
receiveBufferSize | TCP connection parameter SO_RCVBUF. |
sendBufferSize | TCP connection parameter SO_SNDBUF. |
isSentinel | true represents Redis Sentinel Cluster, while false represents Single Node or Sharded Cluster. |
sentinelUser | Username for connecting to Sentinel. |
sentinelPassword | Password for connecting to Sentinel. |
sentinelMasterName | Master Name specified in the Redis Sentinel configuration. |
Tips: To modify the general parameters, see General Parameters and Functions.
Prerequisites
| Prerequisite | Description |
|---|---|
Port Preparation | Allow the migration and sync node (Worker) to connect to the Redis port and Sentinel port (if available). |
Parameters
| Parameter | Description |
|---|---|
isSentinel | true represents Redis Sentinel Cluster, while false represents Single Node or Sharded Cluster. |
sentinelUser | Username for connecting to Sentinel. |
sentinelPassword | Password for connecting to Sentinel. |
sentinelMasterName | Master Name specified in the Redis Sentinel configuration. |
secondsToExpire | Use the set command to specify the expiration time of data written to the Target; -1 means no limit. |
Tips: To modify the general parameters, see General Parameters and Functions.