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Updated on 2024-02-08 GMT+08:00
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From Kvrocks to GeminiDB Redis API

RocksDB is a persistent key-value store, single-node DB engine developed by Facebook based on LevelDB. It has powerful sequential read/write and random write performance. Compared with LevelDB, RocksDB has many optimizations. Its performance is greatly improved and the problem that LevelDB proactively restricts write operations is solved. As a DB engine, RocksDB does not provide the C/S network structure. It must be deployed on the same server as your services.

GeminiDB Redis API uses RocksDB as the storage engine and is compatible with the Redis protocol, meeting the usage requirements of RocksDB. In addition, RocksDB has been customized to allow storage to be scaled in seconds, making it easy to migrate RocksDB workloads to the Redis ecosystem. You do not need to migrate data during scaling.

This section describes how to migrate data from RocksDB to GeminiDB Redis API.

Migration Principles

  • Use the self-developed migration tool rocksdb-port to deploy RocksDB on the same server as your services, prepare the configuration file, and start the migration task to automatically complete full and incremental migration.
  • The full migration process is efficient. It takes a snapshot of the RocksDB data, scans the entire database, packs the data into a format that can be identified by GeminiDB Redis API, and then sends the data to GeminiDB Redis API.
  • During incremental migration, the WAL file of RocksDB and the RocksDB operations are parsed, and the keys in the WAL file are sharded and sent by multiple threads.

Precautions

  • The migration tool needs to be deployed on the source DB, which consumes certain performance. You can modify the configuration file to control the performance.
  • During the migration, the source data file of RocksDB is read-only. There is no risk of data damage.
  • Services do not need to be stopped during the migration.
  • If a fault occurs during the migration, clear the GeminiDB Redis instance and restart the migration.

Procedure

To migrate data from RocksDB to GeminiDB Redis API, choose Service Tickets > Create Service Ticket in the upper right corner of the management console and contact technical support.

Parent topic: Data Migration