@Override
    public void onShutdown() {
        // Destroy all empty file
        for (final AllocatedResult result : this.blankFiles) {
            if (result.abstractFile != null) {
                result.abstractFile.shutdown(5000, false);
            }
        }
    }
Pre allocate abstractFile service
@author boyan(boyan@antfin.com), hzh (642256541@qq.com)
jraft-extension/java-log-storage-impl/src/main/java/com/alipay/sofa/jraft/storage/service/AllocateFileService.java