Spring Can we use ConcurrentHashMap to add BeanDefinition to ConcurrentMap instead of set

My project has one hundred thousand beans+ to initialize into spring. However every time it needs several imnutes to complete its work. I found ClassPathBeanDefinitionScanner.doScan 's code which does work one by one. So I have a question, because it use Set to collect, can we use ConcurrentHashMap instead of it? That map's value just can use any Object such as new Object to fill it like Set inner code.

My spring version : 5.1.19. Below is that current release code:

My Suggestion is that:

`protected Set doScan(String... basePackages) { Assert.notEmpty(basePackages, "At least one base package must be specified"); Set beanDefinitions = new LinkedHashSet<>();

    ConcurrentHashMap<BeanDefinition,Object> candidates = new ConcurrentHashMap<BeanDefinition, Object>();
    Arrays.stream(basePackages).parallel().map(x->{
        return   findCandidateComponents(basePackage);

    }).forEach(x->{

        candidates.put(x,new Object());
    });

    for (String basePackage : basePackages) {

        for (BeanDefinition candidate : candidates) {
            ScopeMetadata scopeMetadata = this.scopeMetadataResolver.resolveScopeMetadata(candidate);
            candidate.setScope(scopeMetadata.getScopeName());
            String beanName = this.beanNameGenerator.generateBeanName(candidate, this.registry);
            if (candidate instanceof AbstractBeanDefinition) {
                postProcessBeanDefinition((AbstractBeanDefinition) candidate, beanName);
            }
            if (candidate instanceof AnnotatedBeanDefinition) {
                AnnotationConfigUtils.processCommonDefinitionAnnotations((AnnotatedBeanDefinition) candidate);
            }
            if (checkCandidate(beanName, candidate)) {
                BeanDefinitionHolder definitionHolder = new BeanDefinitionHolder(candidate, beanName);
                definitionHolder =
                        AnnotationConfigUtils.applyScopedProxyMode(scopeMetadata, definitionHolder, this.registry);
                beanDefinitions.add(definitionHolder);
                registerBeanDefinition(definitionHolder, this.registry);
            }
        }
    }
    return beanDefinitions;
}`

Comment From: snicoll

Thanks for the suggestion but post-processing bean definitions asynchronously is not possible at the moment. See also #13410