使用Python或Java从本地将数据上传到Azure ADLS Gen2

Question

我在Data Lake Gen2中拥有一个Azure存储帐户。我想使用Python（或Java）将数据从本地上传到Lake Gen2文件系统。

我已经找到了有关如何与存储帐户中的文件共享进行交互的示例，但是我仍无法找到如何上传到Lake（而不是文件共享）的示例。我还发现了如何在Gen1
Lakes上执行此操作，但是除了已关闭的Gen2
请求外，什么都没有。

我的问题是，到今天为止，是否可以用Python做到这一点？或者，如何使用Java将文件上传到Gen2
Lake？演示用于上传的API调用的代码片段将受到高度赞赏。

Answer 1

根据官方教程Quickstart: Upload, download, and list blobs with Python，如下所示，如果尚未注册Data Lake
Storage上
的多协议访问的公共预览，则不能直接使用Python的Azure存储SDK在Azure
Data Lake Store Gen 2中进行任何操作。

注意

仅当您在Data Lake Storage上注册多协议访问的公共预览时，本文中介绍的功能才可用于具有分层名称空间的帐户。要查看限制，请参阅已知问题文章。

因此，将数据上传到ADLS Gen2的唯一解决方案是使用ADLS Gen2的REST API，请参阅其参考Azure Data Lake Store REST API。

这是我的示例代码，可以使用Python将数据上传到ADLS Gen2，并且工作正常。

import requests
import json

def auth(tenant_id, client_id, client_secret):
    print('auth')
    auth_headers = {
        "Content-Type": "application/x-www-form-urlencoded"
    }
    auth_body = {
        "client_id": client_id,
        "client_secret": client_secret,
        "scope" : "https://storage.azure.com/.default",
        "grant_type" : "client_credentials"
    }
    resp = requests.post(f"https://login.microsoftonline.com/{tenant_id}/oauth2/v2.0/token", headers=auth_headers, data=auth_body)
    return (resp.status_code, json.loads(resp.text))

def mkfs(account_name, fs_name, access_token):
    print('mkfs')
    fs_headers = {
        "Authorization": f"Bearer {access_token}"
    }
    resp = requests.put(f"https://{account_name}.dfs.core.windows.net/{fs_name}?resource=filesystem", headers=fs_headers)
    return (resp.status_code, resp.text)

def mkdir(account_name, fs_name, dir_name, access_token):
    print('mkdir')
    dir_headers = {
        "Authorization": f"Bearer {access_token}"
    }
    resp = requests.put(f"https://{account_name}.dfs.core.windows.net/{fs_name}/{dir_name}?resource=directory", headers=dir_headers)
    return (resp.status_code, resp.text)

def touch_file(account_name, fs_name, dir_name, file_name, access_token):
    print('touch_file')
    touch_file_headers = {
        "Authorization": f"Bearer {access_token}"
    }
    resp = requests.put(f"https://{account_name}.dfs.core.windows.net/{fs_name}/{dir_name}/{file_name}?resource=file", headers=touch_file_headers)
    return (resp.status_code, resp.text)

def append_file(account_name, fs_name, path, content, position, access_token):
    print('append_file')
    append_file_headers = {
        "Authorization": f"Bearer {access_token}",
        "Content-Type": "text/plain",
        "Content-Length": f"{len(content)}"
    }
    resp = requests.patch(f"https://{account_name}.dfs.core.windows.net/{fs_name}/{path}?action=append&position={position}", headers=append_file_headers, data=content)
    return (resp.status_code, resp.text)

def flush_file(account_name, fs_name, path, position, access_token):
    print('flush_file')
    flush_file_headers = {
        "Authorization": f"Bearer {access_token}"
    }
    resp = requests.patch(f"https://{account_name}.dfs.core.windows.net/{fs_name}/{path}?action=flush&position={position}", headers=flush_file_headers)
    return (resp.status_code, resp.text)

def mkfile(account_name, fs_name, dir_name, file_name, local_file_name, access_token):
    print('mkfile')
    status_code, result = touch_file(account_name, fs_name, dir_name, file_name, access_token)
    if status_code == 201:
        with open(local_file_name, 'rb') as local_file:
            path = f"{dir_name}/{file_name}"
            content = local_file.read()
            position = 0
            append_file(account_name, fs_name, path, content, position, access_token)
            position = len(content)
            flush_file(account_name, fs_name, path, position, access_token)
    else:
        print(result)


if __name__ == '__main__':
    tenant_id = '<your tenant id>'
    client_id = '<your client id>'
    client_secret = '<your client secret>'

    account_name = '<your adls account name>'
    fs_name = '<your filesystem name>'
    dir_name = '<your directory name>'
    file_name = '<your file name>'
    local_file_name = '<your local file name>'

    # Acquire an Access token
    auth_status_code, auth_result = auth(tenant_id, client_id, client_secret)
    access_token = auth_status_code == 200 and auth_result['access_token'] or ''
    print(access_token)

    # Create a filesystem
    mkfs_status_code, mkfs_result = mkfs(account_name, fs_name, access_token)
    print(mkfs_status_code, mkfs_result)

    # Create a directory
    mkdir_status_code, mkdir_result = mkdir(account_name, fs_name, dir_name, access_token)
    print(mkdir_status_code, mkdir_result)

    # Create a file from local file
    mkfile(account_name, fs_name, dir_name, file_name, local_file_name, access_token)

希望能帮助到你。