Managing code and data in multi-cluster environments

A method, comprising:

• executing, by one or more computer systems in a cluster, a broker that controls serving of queries to storage nodes providing a distributed database in the cluster;
• monitoring, by the broker, states reported by the storage nodes to a synchronization service;
• when a first storage node in the cluster reports a change from a not-ready state to a ready state to the synchronization service, comparing, by the broker, one or more attributes associated with the change on the first storage node with expected values of the one or more attributes;
• and
• when the one or more attributes on all of the storage nodes match the expected values, triggering, by the broker, serving of the queries to the storage nodes in the cluster.

A non-transitory computer-readable storage medium storing instructions that when executed by a computer cause the computer to perform a method, the method comprising:

• executing a synchronization service that coordinates actions for managing code and data among clusters in a multi-cluster environment, wherein the actions comprise creating a database image in a distributed database, copying the database image, and loading the database image;
• upon receiving one or more issuances of a first action from schedulers of actions in the clusters, storing a single instance of the first action in an action list provided by the synchronization service;
• upon receiving one or more subsequent issuances of a second action from the schedulers, storing a single instance of the second action after the single instance of the first action in the action list;
• and
• upon receiving a change in state for a storage node in a cluster within the multi-cluster environment, providing the change in state to one or more brokers that control traffic to the storage node within the cluster.