{"id":36672,"date":"2023-11-27T20:45:44","date_gmt":"2023-09-11T18:28:17","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8apache-beam%e5%ae%9e%e7%8e%b0%e5%b7%a6%e8%bf%9e%e6%8e%a5\/"},"modified":"2024-05-04T11:04:36","modified_gmt":"2024-05-04T03:04:36","slug":"%e4%bd%bf%e7%94%a8apache-beam%e5%ae%9e%e7%8e%b0%e5%b7%a6%e8%bf%9e%e6%8e%a5","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8apache-beam%e5%ae%9e%e7%8e%b0%e5%b7%a6%e8%bf%9e%e6%8e%a5\/","title":{"rendered":"\u4f7f\u7528Apache Beam\u5b9e\u73b0\u5de6\u8fde\u63a5"},"content":{"rendered":"

\u9996\u5148<\/h1>\n

\u867d\u7136\u53d6\u5f97\u4e86PDE\u8d44\u683c\uff0c\u4f46\u7531\u4e8e\u65e0\u6cd5\u4ece\u96f6\u5f00\u59cb\u7f16\u5199\u4ee3\u7801\u5e76\u521b\u5efa\u6d41\u6c34\u7ebf\uff0c\u6240\u4ee5\u6211\u5f00\u59cb\u7ec3\u4e60\u7f16\u7801\u3002Apache Spark\u7684\u8bed\u6cd5\u7c7b\u4f3c\u4e8ePandas\uff0c\u5f88\u5bb9\u6613\u7406\u89e3\uff0c\u4f46\u662f\u6211\u5728Apache Beam\u7684\u72ec\u7279\u8bed\u6cd5\u4e0a\u9047\u5230\u4e86\u56f0\u96be\uff0c\u7279\u522b\u662f\u5728\u5b9e\u73b0Left Join\u7684\u65b9\u6cd5\u4e0a\uff0cBeam\u5e76\u6ca1\u6709\uff08\u53ef\u80fd\u53ea\u662f\u6211\u6ca1\u6709\u627e\u5230\uff09\u5b9e\u73b0\uff0c\u56e0\u6b64\u6211\u51b3\u5b9a\u5c06\u8fd9\u7bc7\u6587\u7ae0\u4fdd\u5b58\u4e0b\u6765\u3002<\/p>\n

\u73af\u5883<\/h1>\n
[tool.poetry]<\/span>\r\nname<\/span> =<\/span> \"beam\"<\/span>\r\nversion<\/span> =<\/span> \"0.1.0\"<\/span>\r\ndescription<\/span> =<\/span> \"\"<\/span>\r\nauthors<\/span> =<\/span> [<\/span>\"Kamegrueon\"<\/span>]<\/span>\r\n\r\n[tool.poetry.dependencies]<\/span>\r\npython<\/span> =<\/span> \"^3.9\"<\/span>\r\njupyter<\/span> =<\/span> \"^1.0.0\"<\/span>\r\napache-beam<\/span> =<\/span> \"^2.46.0\"<\/span>\r\n\r\n[build-system]<\/span>\r\nrequires<\/span> =<\/span> [<\/span>\"poetry-core\"<\/span>]<\/span>\r\nbuild-backend<\/span> =<\/span> \"poetry.core.masonry.api\"<\/span>\r\n<\/code><\/pre>\n
\u5df2\u5b9e\u65bd\u7684\u4ee3\u7801<\/h1>\n
\u6211\u5df2\u7ecf\u4e0a\u4f20\u4e86\u4ee3\u7801\u5230 Git\u3002<\/p>\n
 <\/p>\n
\u89e3\u91ca<\/h2>\n
\u5de6\u8fde\u63a5\uff08Left Join\uff09\u7c7b<\/h3>\n
# Apache Beam\u306ePTransform\u3092\u7d99\u627f\u3057\u3066\u3001LeftJoin\u3068\u3044\u3046\u65b0\u3057\u3044PTransform\u3092\u4f5c\u6210\u3059\u308b\r\n<\/span>class<\/span> LeftJoin<\/span>(<\/span>beam<\/span>.<\/span>PTransform<\/span>):<\/span>\r\n  def<\/span> __init__<\/span>(<\/span>self<\/span>,<\/span> right_pcoll<\/span>:<\/span> PCollection<\/span>,<\/span> join_key<\/span>:<\/span> str<\/span>,<\/span> join_cols<\/span>:<\/span> Union<\/span>[<\/span>list<\/span>[<\/span>str<\/span>],<\/span> None<\/span>]<\/span>=<\/span>None<\/span>):<\/span>\r\n    self<\/span>.<\/span>right_pcoll<\/span> =<\/span> right_pcoll<\/span>\r\n    self<\/span>.<\/span>join_key<\/span> =<\/span> join_key<\/span>\r\n    self<\/span>.<\/span>join_cols<\/span> =<\/span> join_cols<\/span>\r\n  \r\n   # PTransform\u3092\u62e1\u5f35\u3059\u308b\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9\r\n<\/span>  def<\/span> expand<\/span>(<\/span>self<\/span>,<\/span> pcoll<\/span>:<\/span> PCollection<\/span>):<\/span>\r\n    return <\/span>(<\/span> pcoll<\/span> |<\/span> beam<\/span>.<\/span>FlatMap<\/span>(<\/span>\r\n              fn<\/span>=<\/span>left_join<\/span>,<\/span> # \u5de6\u30c6\u30fc\u30d6\u30eb\u306e\u5404\u884c\u3068\u53f3\u30c6\u30fc\u30d6\u30eb\u306e\u30c7\u30fc\u30bf\u3092\u7d50\u5408\u3059\u308b\u305f\u3081\u306bleft_join\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\r\n<\/span>              right_element<\/span>=<\/span>AsList<\/span>(<\/span>self<\/span>.<\/span>right_pcoll<\/span>),<\/span> # \u53f3\u30c6\u30fc\u30d6\u30eb\u306e\u30c7\u30fc\u30bf\u3092AsList\u3067\u30ea\u30b9\u30c8\u5316\u3059\u308b\r\n<\/span>              join_key<\/span>=<\/span>self<\/span>.<\/span>join_key<\/span>,<\/span> # \u7d50\u5408\u306b\u4f7f\u7528\u3059\u308b\u30ad\u30fc\r\n<\/span>              join_cols<\/span>=<\/span>self<\/span>.<\/span>join_cols<\/span> # \u53f3\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u7d50\u5408\u3057\u305f\u3044\u30ab\u30e9\u30e0\u306e\u30ea\u30b9\u30c8\u3001None\u306e\u5834\u5408\u306f\u5168\u3066\u306e\u30ab\u30e9\u30e0\u3092\u4f7f\u7528\u3059\u308b\r\n<\/span>  ))<\/span>\r\n<\/code><\/pre>\n
\u4e0d\u4f7f\u7528ParDo Transform\uff0c\u800c\u662f\u901a\u8fc7\u7ee7\u627fPTransform\u6765\u521b\u5efa\u7c7b\u3002
\n\u539f\u56e0\u662f\u5728\u53c2\u8003\u7684\u4ee3\u7801\u4e2d\u662f\u8fd9\u6837\u5b9e\u73b0\u7684\uff0c\u4f46\u662f\u4ec5\u4ec5\u901a\u8fc7\u751f\u6210\u4e0e\u666e\u901aParDo Transform\u76f8\u540c\u7684\u7c7b\u5e76\u4e0d\u80fd\u6b63\u5e38\u8fd0\u884cbeam.AsList\u65b9\u6cd5\uff0c\u4f1a\u51fa\u73b0\u9519\u8bef\u3002<\/p>\n
\u5de6\u8fde\u63a5\u51fd\u6570<\/h3>\n
# \u5de6\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u3068\u53f3\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\u3059\u308b\u95a2\u6570\r\n<\/span>def<\/span> left_join<\/span>(<\/span>left_element<\/span>:<\/span> dict<\/span>,<\/span> right_element<\/span>:<\/span> list<\/span>[<\/span>dict<\/span>],<\/span> join_key<\/span>:<\/span> str<\/span>,<\/span> join_cols<\/span>:<\/span> Union<\/span>[<\/span>list<\/span>[<\/span>str<\/span>],<\/span> None<\/span>]):<\/span>\r\n    # \u6307\u5b9a\u3055\u308c\u305f\u30ab\u30e9\u30e0\u3092\u62bd\u51fa\r\n<\/span>    right_elem<\/span>:<\/span> list<\/span>[<\/span>dict<\/span>]<\/span> =<\/span> extract_join_cols<\/span>(<\/span>right_element<\/span>,<\/span> join_key<\/span>,<\/span> join_cols<\/span>)<\/span>\r\n    for<\/span> right<\/span> in<\/span> right_elem<\/span>:<\/span>\r\n      # join_key\u304c\u4e00\u81f4\u3059\u308b\u5834\u5408\u306f\u7d50\u5408\u3057\u3001yield\u3067\u8fd4\u3059\r\n<\/span>      if<\/span> left_element<\/span>[<\/span>join_key<\/span>]<\/span> ==<\/span> right<\/span>[<\/span>join_key<\/span>]:<\/span>\r\n        yield<\/span> {<\/span>**<\/span>left_element<\/span>,<\/span> **<\/span>right<\/span>}<\/span>\r\n        return<\/span>\r\n      \r\n    # join_key\u304c\u4e00\u81f4\u3057\u306a\u3044\u5834\u5408\u3001\u7a7a\u306e\u30c7\u30fc\u30bf\u3092\u8ffd\u52a0\u3057\u3066\u7d50\u5408\u3059\u308b\r\n<\/span>    empty_keys<\/span>:<\/span> list<\/span>[<\/span>str<\/span>]<\/span> =<\/span> list<\/span>(<\/span>filter<\/span>(<\/span>lambda<\/span> x<\/span>:<\/span> x<\/span> !=<\/span> join_key<\/span>,<\/span> right_elem<\/span>[<\/span>0<\/span>].<\/span>keys<\/span>()))<\/span>\r\n    yield<\/span> {<\/span>**<\/span>left_element<\/span>,<\/span> **<\/span>{<\/span> key<\/span>:<\/span> ''<\/span> for<\/span> key<\/span> in<\/span> empty_keys<\/span> }}<\/span>\r\n<\/code><\/pre>\n
\u5b9e\u73b0extract_join_cols\u51fd\u6570\uff0c\u4ee5\u4fbf\u53ea\u80fd\u8fde\u63a5\u53f3\u8868\u7684\u4efb\u610f\u5217\uff08\u540e\u8ff0\uff09\u3002\u5982\u679c\u5de6\u8868\u548c\u53f3\u8868\u7684\u952e\u5339\u914d\uff0c\u5219\u5c06\u53f3\u8868\u5408\u5e76\u5230\u5de6\u8868\u4e2d\uff1b\u5982\u679c\u4e0d\u5339\u914d\uff0c\u5219\u5c06\u7a7a\u503c\u5408\u5e76\u3002\u5982\u679c\u53f3\u8868\u6709\u591a\u4e2a\u5339\u914d\u884c\uff0c\u5219\u53ea\u5408\u5e76\u7b2c\u4e00\u4e2a\u5339\u914d\u884c\u3002<\/p>\n
\u63d0\u53d6\u8fde\u63a5\u5217\u51fd\u6570<\/h3>\n
def<\/span> extract_join_cols<\/span>(<\/span>right_element<\/span>:<\/span> list<\/span>[<\/span>dict<\/span>],<\/span> join_key<\/span>:<\/span> str<\/span>,<\/span> join_cols<\/span>:<\/span> Union<\/span>[<\/span>list<\/span>[<\/span>str<\/span>],<\/span> None<\/span>]):<\/span>\r\n    if<\/span> join_cols<\/span> is<\/span> not<\/span> None<\/span>:<\/span>\r\n      # \u30ea\u30b9\u30c8\u5185\u5305\u8868\u8a18\u3092\u7528\u3044\u3066\u6307\u5b9a\u3055\u308c\u305f\u30ab\u30e9\u30e0\u3060\u3051\u3092\u53d6\u5f97\u3057\u3001\u65b0\u3057\u3044\u30ea\u30b9\u30c8\u3092\u4f5c\u6210\r\n<\/span>      extract_right_element<\/span>:<\/span> list<\/span>[<\/span>dict<\/span>]<\/span> =<\/span> [<\/span>\r\n        {<\/span> k<\/span>:<\/span> v<\/span> for<\/span> k<\/span>,<\/span> v<\/span> in<\/span> dic<\/span>.<\/span>items<\/span>()<\/span> if<\/span> k<\/span> in<\/span> [<\/span> *<\/span>join_cols<\/span>,<\/span> join_key<\/span> ]}<\/span> for<\/span> dic<\/span> in<\/span> right_element<\/span>\r\n      ]<\/span>\r\n      return<\/span> extract_right_element<\/span>\r\n    # \u6307\u5b9a\u3055\u308c\u305f\u30ab\u30e9\u30e0\u304c\u306a\u3051\u308c\u3070\u305d\u306e\u307e\u307e\u8fd4\u3059\r\n<\/span>    return<\/span> right_element<\/span>\r\n<\/code><\/pre>\n
\u901a\u8fc7\u4f7f\u7528\u5217\u8868\u5185\u5305\u8868\u8fbe\u5f0f\uff0c\u53ef\u4ee5\u4ece\u53f3\u8868\u7684\u5217\u8868\u4e2d\u63d0\u53d6\u51fa\u7684\u5b57\u5178\u5bf9\u8c61\u4e2d\u83b7\u53d6\u952e\u548c\u503c\uff0c\u5e76\u4ec5\u63d0\u53d6\u6307\u5b9a\u7684join_cols\u5217\u548cjoin_key\u5217\uff0c\u7136\u540e\u751f\u6210\u5305\u542b\u5b57\u5178\u7684\u5217\u8868\u3002
\n\u5982\u679c\u6ca1\u6709\u6307\u5b9ajoin_cols\uff0c\u5219\u9ed8\u8ba4\u4e3aNone\uff0c\u56e0\u6b64\uff0c\u5982\u679c\u6ca1\u6709\u6307\u5b9a\uff0c\u5219\u65e0\u9700\u8fdb\u884c\u4efb\u4f55\u5904\u7406\u5e76\u8fd4\u56de\u3002<\/p>\n
\u8f93\u51fa\u7ed3\u679c<\/h3>\n
\u5728\u4e2d\u56fd\uff0c\u53ea\u9700\u8981\u4e00\u79cd\u9009\u62e9\uff1a\u8fdb\u884c\u4ee5\u4e0b\u5185\u5bb9\u7684\u4e2d\u6587\u672c\u5730\u5316\u3002<\/p>\n
left_pcoll<\/span> =<\/span> p<\/span> |<\/span> \"<\/span>Create Left PCollection<\/span>\"<\/span> >><\/span> beam<\/span>.<\/span>Create<\/span>([<\/span>\r\n    {<\/span>'<\/span>join_key<\/span>'<\/span>:<\/span> 1<\/span>,<\/span> '<\/span>left_value_1<\/span>'<\/span>:<\/span> '<\/span>a<\/span>'<\/span>,<\/span> '<\/span>left_value_2<\/span>'<\/span>:<\/span> '<\/span>b<\/span>'<\/span>},<\/span>\r\n    {<\/span>'<\/span>join_key<\/span>'<\/span>:<\/span> 2<\/span>,<\/span> '<\/span>left_value_1<\/span>'<\/span>:<\/span> '<\/span>c<\/span>'<\/span>,<\/span> '<\/span>left_value_2<\/span>'<\/span>:<\/span> '<\/span>d<\/span>'<\/span>},<\/span>\r\n    {<\/span>'<\/span>join_key<\/span>'<\/span>:<\/span> 2<\/span>,<\/span> '<\/span>left_value_1<\/span>'<\/span>:<\/span> '<\/span>e<\/span>'<\/span>,<\/span> '<\/span>left_value_2<\/span>'<\/span>:<\/span> '<\/span>f<\/span>'<\/span>},<\/span>\r\n    {<\/span>'<\/span>join_key<\/span>'<\/span>:<\/span> 3<\/span>,<\/span> '<\/span>left_value_1<\/span>'<\/span>:<\/span> '<\/span>g<\/span>'<\/span>,<\/span> '<\/span>left_value_2<\/span>'<\/span>:<\/span> '<\/span>h<\/span>'<\/span>}<\/span>\r\n])<\/span>\r\n    \r\n# \u53f3\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u6210\u3059\u308b\r\n<\/span>right_pcoll<\/span> =<\/span> p<\/span> |<\/span> \"<\/span>Create Right PCollection<\/span>\"<\/span> >><\/span> beam<\/span>.<\/span>Create<\/span>([<\/span>\r\n    {<\/span>'<\/span>join_key<\/span>'<\/span>:<\/span> 1<\/span>,<\/span> '<\/span>right_value<\/span>'<\/span>:<\/span> '<\/span>A<\/span>'<\/span>,<\/span> '<\/span>not_join_value<\/span>'<\/span>:<\/span> \"<\/span>D<\/span>\"<\/span>},<\/span>\r\n    {<\/span>'<\/span>join_key<\/span>'<\/span>:<\/span> 2<\/span>,<\/span> '<\/span>right_value<\/span>'<\/span>:<\/span> '<\/span>B<\/span>'<\/span>,<\/span> '<\/span>not_join_value<\/span>'<\/span>:<\/span> \"<\/span>E<\/span>\"<\/span>},<\/span>\r\n    {<\/span>'<\/span>join_key<\/span>'<\/span>:<\/span> 4<\/span>,<\/span> '<\/span>right_value<\/span>'<\/span>:<\/span> '<\/span>C<\/span>'<\/span>,<\/span> '<\/span>not_join_value<\/span>'<\/span>:<\/span> \"<\/span>F<\/span>\"<\/span>}<\/span>\r\n])<\/span>\r\n<\/code><\/pre>\n
\u51fa\u53bb<\/p>\n
{<\/span>'<\/span>join_key<\/span>'<\/span>:<\/span> 1<\/span>,<\/span> '<\/span>left_value_1<\/span>'<\/span>:<\/span> '<\/span>a<\/span>'<\/span>,<\/span> '<\/span>left_value_2<\/span>'<\/span>:<\/span> '<\/span>b<\/span>'<\/span>,<\/span> '<\/span>right_value<\/span>'<\/span>:<\/span> '<\/span>A<\/span>'<\/span>}<\/span>\r\n{<\/span>'<\/span>join_key<\/span>'<\/span>:<\/span> 2<\/span>,<\/span> '<\/span>left_value_1<\/span>'<\/span>:<\/span> '<\/span>c<\/span>'<\/span>,<\/span> '<\/span>left_value_2<\/span>'<\/span>:<\/span> '<\/span>d<\/span>'<\/span>,<\/span> '<\/span>right_value<\/span>'<\/span>:<\/span> '<\/span>B<\/span>'<\/span>}<\/span>\r\n{<\/span>'<\/span>join_key<\/span>'<\/span>:<\/span> 2<\/span>,<\/span> '<\/span>left_value_1<\/span>'<\/span>:<\/span> '<\/span>e<\/span>'<\/span>,<\/span> '<\/span>left_value_2<\/span>'<\/span>:<\/span> '<\/span>f<\/span>'<\/span>,<\/span> '<\/span>right_value<\/span>'<\/span>:<\/span> '<\/span>B<\/span>'<\/span>}<\/span>\r\n{<\/span>'<\/span>join_key<\/span>'<\/span>:<\/span> 3<\/span>,<\/span> '<\/span>left_value_1<\/span>'<\/span>:<\/span> '<\/span>g<\/span>'<\/span>,<\/span> '<\/span>left_value_2<\/span>'<\/span>:<\/span> '<\/span>h<\/span>'<\/span>,<\/span> '<\/span>right_value<\/span>'<\/span>:<\/span> ''<\/span>}<\/span>\r\n<\/code><\/pre>\n
\u8bf7\u63d0\u4f9b\u76f8\u5173\u7684\u8d44\u6599<\/h1>\n
\u53c2\u8003\u8d44\u6599\u7684\u5f15\u7528<\/p>\n
\u8bf7\u63d0\u4f9b\u6587\u732e\u6765\u6e90<\/p>\n
\u5f15\u6587<\/p>\n
\u53c2\u8003\u4e66\u76ee<\/p>\n
 <\/p>\n
\u6700\u540e<\/h1>\n
\u6211\u5728\u5bfb\u627e\u548c\u5b9e\u65bd\u4fe1\u606f\u65f6\u9047\u5230\u4e86\u4e00\u4e9b\u56f0\u96be\uff0c\u4f46\u6211\u89c9\u5f97\u4e0e\u5176\u5728Apache Beam\u4e2d\u8fdb\u884c\u8fde\u63a5\uff0c\u4e0d\u5982\u5148\u5c06\u5176\u5bfc\u5165\u5230Bigquery\u7b49\u4e2d\u518d\u8fdb\u884c\u8f6c\u6362\u66f4\u5bb9\u6613\uff08\u5bf9\u4e8e\u5904\u7406\u901f\u5ea6\u4e5f\u662f\u5982\u6b64\uff09\u3002
\n\u4e0d\u8fc7\uff0c\u5728\u5b9e\u65bd\u8fc7\u7a0b\u4e2d\uff0c\u6211\u611f\u89c9\u5bf9PCollection\u548cPTransform\u7b49\u65b9\u9762\u7684\u77e5\u8bc6\u6709\u4e86\u76f8\u5f53\u5927\u7684\u63d0\u9ad8\uff0c\u6240\u4ee5\u6211\u8ba4\u4e3a\u8fd9\u4e2a\u6311\u6218\u662f\u503c\u5f97\u7684\u3002
\n\u63a5\u4e0b\u6765\u6211\u4f1a\u5c1d\u8bd5\u5728Dataflow\u4e0a\u8fd0\u884c\u800c\u4e0d\u662f\u5728\u672c\u5730\u6d4b\u8bd5\u662f\u5426\u6b63\u5e38\u5de5\u4f5c\u3002
\n\u5982\u679c\u6709\u4eba\u60f3\u4f7f\u7528Beam\u5b9e\u73b0LeftJoin\uff0c\u5e0c\u671b\u8fd9\u4e2a\u9879\u76ee\u80fd\u5bf9\u4ed6\u4eec\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n
PS\uff1a\u81ea\u4ece\u63a5\u89e6 TypeScript \u540e\uff0c\u6ca1\u6709\u7c7b\u578b\u4f1a\u8ba9\u6211\u611f\u89c9\u5f88\u4e0d\u8212\u670d\uff0c\u54c8\u54c8\u3002<\/p>\n
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