gRPC 9 FAILED_PRECONDITION vs 14 UNAVAILABLE
Both gRPC 9 (FAILED_PRECONDITION) and 14 (UNAVAILABLE) belong to the gRPC Status Codes category. 9 indicates that the operation was rejected because the system is not in a state required for the operation's execution. For example, deleting a non-empty directory. Meanwhile, 14 means that the service is currently unavailable. This is most likely a transient condition, which can be corrected by retrying with a backoff.
Описание
The operation was rejected because the system is not in a state required for the operation's execution. For example, deleting a non-empty directory.
Когда вы это видите
The request is valid on its own, but the system's current state doesn't allow it — like trying to delete a non-empty directory or update a resource that has been modified concurrently.
Как исправить
Bring the system into the required state before retrying. For example, empty the directory first, or re-read the resource to get the latest version before updating.
Описание
The service is currently unavailable. This is most likely a transient condition, which can be corrected by retrying with a backoff.
Когда вы это видите
The server is overloaded, shutting down, or a network partition occurred. This is the most common code to retry on, as it's explicitly transient.
Как исправить
Retry with exponential backoff. If persistent, check the server health, load balancer configuration, and network connectivity between client and server.
Ключевые различия
gRPC 9: The operation was rejected because the system is not in a state required for the operation's execution. For example, deleting a non-empty directory.
gRPC 14: The service is currently unavailable. This is most likely a transient condition, which can be corrected by retrying with a backoff.
You encounter 9 when the request is valid on its own, but the system's current state doesn't allow it — like trying to delete a non-empty directory or update a resource that has been modified concurrently.
You encounter 14 when the server is overloaded, shutting down, or a network partition occurred. This is the most common code to retry on, as it's explicitly transient.
Когда что использовать
For 9 (FAILED_PRECONDITION): Bring the system into the required state before retrying. For example, empty the directory first, or re-read the resource to get the latest version before updating. For 14 (UNAVAILABLE): Retry with exponential backoff. If persistent, check the server health, load balancer configuration, and network connectivity between client and server.