Package org.apache.hadoop.io.retry

Annotation Interface AtMostOnce

@Inherited
@Retention(RUNTIME)
@Target(METHOD)
@Evolving
public @interface AtMostOnce

Used to mark certain methods of an interface with at-most-once semantics. Server must guarantee that methods are executed at most once, by keeping a retry cache. The previous response must be returned when duplicate requests are received. Because of these guarantee, a client can retry this request on failover and other network failure conditions.