public static ServiceInstanceID.ServiceInstanceRelationDefine analysisRelationId(String entityId) {
            String[] parts = entityId.split(Const.RELATION_ID_PARSER_SPLIT);
            if (parts.length != 2) {
                throw new RuntimeException("Illegal Service Instance Relation entity id");
            }
            return new ServiceInstanceID.ServiceInstanceRelationDefine(parts[0], parts[1]);
        }
@return service instance relation ID object decoded from {@link #buildRelationId(ServiceInstanceRelationDefine)}
result
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/IDManager.java