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Hi Nick,

you are right. There is no rosbag implementation for ROS 2 yet, but we are currently on it. SQlite3 will be used as the underlying default storage format and we've done some benchmarking of it here: https://github.com/ros2/rosbag2/tree/master/rosbag2_storage_evaluation

However, we are providing a plugin interface with the new implementation, which allows users to add different storage formats underneath in case SQlite3 does not meet their performance requirements.

Does that help?