{"id":46890,"date":"2023-07-10T01:24:22","date_gmt":"2023-08-11T00:25:53","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%a6%82%e4%bd%95%e5%9c%a8structuredstreaming%e4%b8%ad%e5%8f%8d%e6%98%a0join%e9%9d%99%e6%80%81dataframe%e7%9a%84%e6%9b%b4%e6%96%b0\/"},"modified":"2024-04-30T12:47:18","modified_gmt":"2024-04-30T04:47:18","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8structuredstreaming%e4%b8%ad%e5%8f%8d%e6%98%a0join%e9%9d%99%e6%80%81dataframe%e7%9a%84%e6%9b%b4%e6%96%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%a6%82%e4%bd%95%e5%9c%a8structuredstreaming%e4%b8%ad%e5%8f%8d%e6%98%a0join%e9%9d%99%e6%80%81dataframe%e7%9a%84%e6%9b%b4%e6%96%b0\/","title":{"rendered":"\u5982\u4f55\u5728StructuredStreaming\u4e2d\u53cd\u6620JOIN\u9759\u6001Dataframe\u7684\u66f4\u65b0"},"content":{"rendered":"<h1>\u9996\u5148<\/h1>\n<p>\u5728Structured Streaming\u4e2d\uff0c\u6211\u4eec\u6b63\u5728\u901a\u8fc7Kafka\u63a5\u6536\u6d41\u6570\u636e\u5e76\u4e0e\u5b58\u50a8\u5728HDFS\u4e0a\u7684\u8868\u8fdb\u884cJOIN\u64cd\u4f5c\u3002\u6211\u4eec\u4f7f\u7528\u6bcf\u5929\u4e00\u6b21\u7684\u6279\u5904\u7406\u6765\u66f4\u65b0HDFS\u4e0a\u7684\u8868\u3002<\/p>\n<p>\u7531\u4e8e\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u5c06\u8868\u683c\u66f4\u65b0\u53cd\u6620\u5230\u6d41\u7ed3\u679c\u4e2d\u611f\u5230\u56f0\u96be\uff0c\u6240\u4ee5\u6211\u4eec\u5206\u4eab\u8fd9\u4e2a\u7ecf\u9a8c\u3002<\/p>\n<p>\u9996\u5148\u5148\u58f0\u660e\u4e00\u4e0b\uff0c\u8fd9\u6b21\u7684\u5e16\u5b50\u5e76\u6ca1\u6709\u767e\u5206\u4e4b\u767e\u7684\u81ea\u4fe1\uff0c\u6240\u4ee5\u8bf7\u81ea\u884c\u8d1f\u8d23\u53c2\u8003\u3002\u76f8\u53cd\uff0c\u5982\u679c\u6709\u66f4\u597d\u7684\u65b9\u6cd5\uff0c\u8bf7\u6307\u51fa\u6765\u3002<\/p>\n<p>\u7136\u800c\uff0c\u76ee\u524d\u4e3a\u6b62\uff0c\u6211\u4eec\u80fd\u591f\u6b63\u786e\u5904\u7406\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n<h1>\u501f\u9274\u7684\u8d44\u8baf<\/h1>\n<p>Spark\u7684\u90ae\u4ef6\u5217\u8868\u7531databricks\u7684\u4eba\u56de\u7b54\u95ee\u9898\uff0c\u6240\u4ee5\u6211\u76f8\u4fe1\u6ca1\u6709\u95ee\u9898\u3002\u4f46\u662f\uff0c\u56e0\u4e3a\u662f2017\u5e743\u6708\u7684\u4fe1\u606f\uff0c\u53ef\u80fd\u6709\u70b9\u8fc7\u65f6\u3002<\/p>\n<p>\u5728\u90a3\u8fb9\u8ba8\u8bba\u4e86\u4e00\u4e0b\uff0c\u4ed6\u4eec\u6b63\u5728\u4f7f\u7528StructuredStreaming\u5c06Kafka\u7684\u6d41\u6570\u636e\u548cS3\u7684\u6570\u636e\u8fdb\u884cJOIN\u5904\u7406\uff0c\u4f46S3\u6bcf\u5468\u66f4\u65b0\u4e00\u6b21\uff0c\u8981\u5982\u4f55\u5c06\u5176\u53cd\u6620\u51fa\u6765\u3002\u6700\u540e\u5f97\u51fa\u7684\u7ed3\u8bba\u662f\u9700\u8981\u6309\u7167\u4ee5\u4e0b\u6b65\u9aa4\u8fdb\u884c\u64cd\u4f5c\uff0c\u6362\u53e5\u8bdd\u8bf4\uff0c\u5c31\u662f\u8981\u91cd\u65b0\u5f00\u59cb\u505a\u6574\u4e2a\u5904\u7406\u7684\u8fc7\u7a0b\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">static DataFrame\u3092\u518d\u4f5c\u6210\u3059\u308b\uff08\u4f8b\u3067\u306fS3\uff09<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">streaming DataFrame\u3092\u518d\u4f5c\u6210\u3059\u308b\uff08\u4f8b\u3067\u306fKafka\uff09<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">query\u3092restart<\/ul>\n<p>\u5982\u679c\u53ef\u4ee5\u5bb9\u5fcd10\u79d2\u7684\u5ef6\u8fdf\uff0c\u800c\u65e0\u9700\u6574\u4e2a\u5e94\u7528\u7a0b\u5e8f\u91cd\u542f\u7684\u8bdd\uff0c\u90a3\u5c31\u6ca1\u6709\u95ee\u9898\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u5bf9\u539f\u6587\u7684\u4e2d\u6587\u7ffb\u8bd1\uff1a\u5173\u4e8e\u5982\u4f55\u91cd\u542f\u67e5\u8be2\uff0c\u4f60\u53ef\u4ee5\u53c2\u8003\u5728GitHub\u4e0a\u63d0\u4f9b\u7684\u4e00\u4e2a\u793a\u4f8b\u4ee3\u7801\uff0c\u8be5\u4ee3\u7801\u5728&#8221;How to Shutdown a Spark Streaming Job Gracefully&#8221;\u4e00\u6587\u4e2d\u4ecb\u7ecd\u3002\u867d\u7136\u8fd9\u7bc7\u6587\u7ae0\u662f\u57282017\u5e742\u6708\u53d1\u5e03\u7684\uff0c\u6709\u70b9\u65e7\u4e86\uff0c\u4f46\u7531\u4e8e\u662fdatabricks\u7684\u4eba\u53d1\u5e03\u7684\uff0c\u6240\u4ee5\u5e94\u8be5\u662f\u53ef\u4fe1\u7684\u3002<\/p>\n<p>\u53ea\u4e0d\u8fc7\uff0c\u7531\u4e8e\u4f7f\u7528\u7684\u662fSpark Streaming\uff0c\u6240\u4ee5\u9700\u8981\u5c06\u5176\u8f6c\u6362\u4e3aStructured Streaming\u7684API\u3002<br \/>\n\u6211\u4eec\u901a\u8fc7\u4ee5\u4e0b\u4e24\u79cd\u65b9\u6cd5\u8fdb\u884c\u4e86\u5b9e\u73b0\uff0c\u5e76\u4e14\u90fd\u8fdb\u884c\u4e86\u5b9e\u9645\u7684\u8fd0\u884c\u786e\u8ba4\u3002<\/p>\n<h1>\u5b9a\u671f\u91cd\u65b0\u542f\u52a8 de<\/h1>\n<p>\u6211\u7684\u7f16\u7a0b\u8bed\u8a00\u662fPython\u3002<\/p>\n<pre class=\"post-pre\"><code>\r\n<span class=\"k\">def<\/span> <span class=\"nf\">launch<\/span><span class=\"p\">():<\/span>\r\n\r\n    <span class=\"n\">kafkaDataFrame<\/span> <span class=\"o\">=<\/span> <span class=\"n\">spark<\/span><span class=\"p\">.<\/span><span class=\"n\">readStream<\/span><span class=\"p\">.<\/span><span class=\"nb\">format<\/span><span class=\"p\">(<\/span><span class=\"s\">\"kafka\"<\/span><span class=\"p\">)<\/span> \\\r\n                        <span class=\"p\">.<\/span><span class=\"n\">option<\/span><span class=\"p\">(<\/span><span class=\"s\">\"kafka.bootstrap.servers\"<\/span><span class=\"p\">,<\/span><span class=\"s\">\"......\"<\/span><span class=\"p\">)<\/span> \\\r\n                        <span class=\"p\">.<\/span><span class=\"n\">option<\/span><span class=\"p\">(<\/span><span class=\"s\">\"subscribe\"<\/span><span class=\"p\">,<\/span> <span class=\"s\">\"....\"<\/span><span class=\"p\">)<\/span> \\\r\n                        <span class=\"p\">.<\/span><span class=\"n\">load<\/span><span class=\"p\">()<\/span>\r\n\r\n    <span class=\"n\">thresholdDataFrame<\/span> <span class=\"o\">=<\/span> <span class=\"n\">spark<\/span><span class=\"p\">.<\/span><span class=\"n\">read<\/span><span class=\"p\">.<\/span><span class=\"nb\">format<\/span><span class=\"p\">(<\/span><span class=\"s\">\"parquet\"<\/span><span class=\"p\">)<\/span> \\\r\n                            <span class=\"p\">.<\/span><span class=\"n\">load<\/span><span class=\"p\">(<\/span><span class=\"s\">\"hdfs:\/\/....\"<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"c1\"># persist\u3059\u308b\r\n<\/span>    <span class=\"n\">thresholdDataFrame<\/span><span class=\"p\">.<\/span><span class=\"n\">persist<\/span><span class=\"p\">()<\/span>\r\n\r\n    <span class=\"c1\"># \u3044\u308d\u3044\u308d\u51e6\u7406\r\n<\/span>\r\n    <span class=\"c1\"># \u3044\u308d\u3044\u308d\u51e6\u7406\u5f8c\u3001JOIN\r\n<\/span>    <span class=\"n\">withThreshold<\/span> <span class=\"o\">=<\/span> <span class=\"n\">kafkaDataFrame<\/span> \\\r\n                    <span class=\"p\">.<\/span><span class=\"n\">join<\/span><span class=\"p\">(<\/span>\r\n                        <span class=\"n\">thresholdDataFrame<\/span><span class=\"p\">,<\/span>\r\n                        <span class=\"p\">(<\/span><span class=\"n\">hour<\/span><span class=\"p\">(<\/span><span class=\"n\">col<\/span><span class=\"p\">(<\/span><span class=\"s\">\"window.start\"<\/span><span class=\"p\">))<\/span> <span class=\"o\">==<\/span> <span class=\"n\">thresholdDataFrame<\/span><span class=\"p\">.<\/span><span class=\"n\">hour<\/span><span class=\"p\">)<\/span>\r\n                        <span class=\"o\">&amp;<\/span>\r\n                        <span class=\"p\">....<\/span>\r\n                    <span class=\"p\">)<\/span> \\\r\n                    <span class=\"p\">.<\/span><span class=\"n\">select<\/span><span class=\"p\">(...)<\/span>\r\n\r\n\r\n    <span class=\"n\">kafkaQuery<\/span> <span class=\"o\">=<\/span> <span class=\"n\">withThreshold<\/span> \\\r\n                    <span class=\"p\">.<\/span><span class=\"n\">selectExpr<\/span><span class=\"p\">(<\/span><span class=\"s\">\"to_json(struct(*)) AS value\"<\/span><span class=\"p\">)<\/span> \\\r\n                    <span class=\"p\">.<\/span><span class=\"n\">writeStream<\/span> \\\r\n                    <span class=\"p\">.<\/span><span class=\"n\">outputMode<\/span><span class=\"p\">(<\/span><span class=\"s\">\"append\"<\/span><span class=\"p\">)<\/span> \\\r\n                    <span class=\"p\">.<\/span><span class=\"nb\">format<\/span><span class=\"p\">(<\/span><span class=\"s\">\"kafka\"<\/span><span class=\"p\">)<\/span> \\\r\n                    <span class=\"p\">.......<\/span>\r\n                    <span class=\"p\">.<\/span><span class=\"n\">start<\/span><span class=\"p\">()<\/span>\r\n\r\n\r\n    <span class=\"n\">isStopped<\/span> <span class=\"o\">=<\/span> <span class=\"bp\">False<\/span>\r\n    <span class=\"c1\"># \u534a\u65e5\u306b\u4e00\u5ea6restart\u3059\u308b\r\n<\/span>    <span class=\"n\">checkIntervalSeconds<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">12<\/span> <span class=\"o\">*<\/span> <span class=\"mi\">60<\/span> <span class=\"o\">*<\/span> <span class=\"mi\">60<\/span>\r\n\r\n    <span class=\"k\">print<\/span><span class=\"p\">(<\/span><span class=\"s\">\"calling awaitTermination\"<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"n\">isStopped<\/span> <span class=\"o\">=<\/span> <span class=\"n\">kafkaQuery<\/span><span class=\"p\">.<\/span><span class=\"n\">awaitTermination<\/span><span class=\"p\">(<\/span><span class=\"n\">checkIntervalSeconds<\/span><span class=\"p\">)<\/span>\r\n\r\n    <span class=\"k\">if<\/span> <span class=\"n\">isStopped<\/span><span class=\"p\">:<\/span>\r\n        <span class=\"k\">print<\/span><span class=\"p\">(<\/span><span class=\"s\">\"confirmed! The streaming context is stopped. Exiting application...\"<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"k\">else<\/span><span class=\"p\">:<\/span>\r\n        <span class=\"k\">print<\/span><span class=\"p\">(<\/span><span class=\"s\">\"Streaming App is still running. Timeout...\"<\/span><span class=\"p\">)<\/span>\r\n\r\n    <span class=\"k\">if<\/span> <span class=\"ow\">not<\/span> <span class=\"n\">isStopped<\/span><span class=\"p\">:<\/span>\r\n        <span class=\"k\">print<\/span><span class=\"p\">(<\/span><span class=\"s\">\"stopping kafkaQuery right now\"<\/span><span class=\"p\">)<\/span>\r\n        <span class=\"n\">kafkaQuery<\/span><span class=\"p\">.<\/span><span class=\"n\">stop<\/span><span class=\"p\">()<\/span>\r\n        <span class=\"k\">print<\/span><span class=\"p\">(<\/span><span class=\"s\">\"kafkaQuery is stopped!!!!!!!\"<\/span><span class=\"p\">)<\/span>\r\n        <span class=\"k\">print<\/span><span class=\"p\">(<\/span><span class=\"s\">\"restarting query!!!!!!!\"<\/span><span class=\"p\">)<\/span>\r\n        <span class=\"n\">launch<\/span><span class=\"p\">()<\/span>\r\n\r\n\r\n<\/code><\/pre>\n<p>\u8fd9\u91cc\u53ea\u662f\u6709\u4e00\u4e9b\u4e0d\u663e\u773c\u7684\u8ff7\u4eba\u4e4b\u5904\uff0c\u6211\u82b1\u4e864\u30015\u4e2a\u5c0f\u65f6\u3002<\/p>\n<p>\u4e00\u65e6\u7406\u89e3\u4e86\uff0c\u975e\u5e38\u7b80\u5355\uff0cawaitTermination\u7684Scala API\u9700\u8981\u6307\u5b9a\u6beb\u79d2\uff0c\u800cPython\u7684API\u5219\u9700\u8981\u6307\u5b9a\u79d2\u3002<\/p>\n<p>\u6211\u53ea\u770b\u8fc7Scala\u7684\u6587\u6863\uff0c\u6240\u4ee5\u6ca1\u6709\u6ce8\u610f\u5230\u8fd9\u4e00\u70b9\uff0c\u6211\u8bd5\u56fe\u5c06\u5176\u8bbe\u7f6e\u4e3a1\u5206\u949f\u4f5c\u4e3a\u6d4b\u8bd5\uff0c\u4f46\u6ca1\u6709\u4efb\u4f55\u8fd4\u56de\u7ed3\u679c\uff0c\u6240\u4ee5\u6211\u653e\u5f03\u4e86\uff0c\u5e76\u4e14\u65e0\u5948\u5730\u60f3\u5230\u4e86\u4e0b\u4e00\u7ae0\u4e2d\u5f15\u53d1\u5f02\u5e38\u7684\u65b9\u6cd5\u3002<\/p>\n<p>\u800c\u4e14\uff0c\u8001\u5b9e\u8bf4\uff0c\u5728\u5199\u8fd9\u7bc7\u6587\u7ae0\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6211\u6ce8\u610f\u5230\u4e86\u4e0a\u9762\u6240\u63d0\u5230\u7684\u5dee\u5f02\u7b11\u51fa\u58f0\u6765\u3002<\/p>\n<h1>\u5728\u66f4\u65b0\u65f6\u5f15\u53d1\u5f02\u5e38\uff0c\u5e76\u5728catch\u4e2d\u91cd\u65b0\u542f\u52a8\u3002<\/h1>\n<pre class=\"post-pre\"><code>\r\n<span class=\"k\">def<\/span> <span class=\"nf\">launch<\/span><span class=\"p\">():<\/span>\r\n\r\n    <span class=\"n\">kafkaDataFrame<\/span> <span class=\"o\">=<\/span> <span class=\"n\">spark<\/span><span class=\"p\">.<\/span><span class=\"n\">readStream<\/span><span class=\"p\">.<\/span><span class=\"nb\">format<\/span><span class=\"p\">(<\/span><span class=\"s\">\"kafka\"<\/span><span class=\"p\">)<\/span> \\\r\n                        <span class=\"p\">.<\/span><span class=\"n\">option<\/span><span class=\"p\">(<\/span><span class=\"s\">\"kafka.bootstrap.servers\"<\/span><span class=\"p\">,<\/span><span class=\"s\">\"......\"<\/span><span class=\"p\">)<\/span> \\\r\n                        <span class=\"p\">.<\/span><span class=\"n\">option<\/span><span class=\"p\">(<\/span><span class=\"s\">\"subscribe\"<\/span><span class=\"p\">,<\/span> <span class=\"s\">\"....\"<\/span><span class=\"p\">)<\/span> \\\r\n                        <span class=\"p\">.<\/span><span class=\"n\">load<\/span><span class=\"p\">()<\/span>\r\n\r\n    <span class=\"n\">thresholdDataFrame<\/span> <span class=\"o\">=<\/span> <span class=\"n\">spark<\/span><span class=\"p\">.<\/span><span class=\"n\">read<\/span><span class=\"p\">.<\/span><span class=\"nb\">format<\/span><span class=\"p\">(<\/span><span class=\"s\">\"parquet\"<\/span><span class=\"p\">)<\/span> \\\r\n                            <span class=\"p\">.<\/span><span class=\"n\">load<\/span><span class=\"p\">(<\/span><span class=\"s\">\"hdfs:\/\/....\"<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"c1\"># persist\u3057\u306a\u3044\uff01\uff01\uff01\uff01\r\n<\/span>    <span class=\"c1\"># thresholdDataFrame.persist()\r\n<\/span>\r\n    <span class=\"c1\"># \u3044\u308d\u3044\u308d\u51e6\u7406\r\n<\/span>\r\n    <span class=\"c1\"># \u3044\u308d\u3044\u308d\u51e6\u7406\u5f8c\u3001JOIN\r\n<\/span>    <span class=\"c1\"># ...\r\n<\/span>    <span class=\"c1\"># ...\r\n<\/span>\r\n    <span class=\"k\">try<\/span><span class=\"p\">:<\/span>\r\n        <span class=\"n\">kafkaQuery<\/span><span class=\"p\">.<\/span><span class=\"n\">awaitTermination<\/span><span class=\"p\">()<\/span>\r\n    <span class=\"k\">except<\/span> <span class=\"n\">StreamingQueryException<\/span> <span class=\"k\">as<\/span> <span class=\"n\">e<\/span><span class=\"p\">:<\/span>\r\n        <span class=\"c1\"># \u304a\u305d\u3089\u304f\u4e0d\u8981\u3060\u304c\u5ff5\u306e\u305f\u3081\r\n<\/span>        <span class=\"n\">kafkaQuery<\/span><span class=\"p\">.<\/span><span class=\"n\">stop<\/span><span class=\"p\">()<\/span>\r\n        <span class=\"c1\"># \u30d0\u30c3\u30c1\u51e6\u7406\u306b\u3088\u3063\u3066thresholdDataFrame\u304c\u66f4\u65b0\u3055\u308c\u305f\u5834\u5408\u30ea\u30b9\u30bf\u30fc\u30c8\r\n<\/span>        <span class=\"k\">if<\/span> <span class=\"n\">re<\/span><span class=\"p\">.<\/span><span class=\"n\">search<\/span><span class=\"p\">(<\/span><span class=\"sa\">r<\/span><span class=\"s\">\"java\\.io\\.FileNotFoundException.*part.*parquet\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">traceback<\/span><span class=\"p\">.<\/span><span class=\"n\">format_exc<\/span><span class=\"p\">()):<\/span>\r\n            <span class=\"k\">print<\/span><span class=\"p\">(<\/span><span class=\"s\">\"===================================================\"<\/span><span class=\"p\">)<\/span>\r\n            <span class=\"k\">print<\/span><span class=\"p\">(<\/span><span class=\"s\">\"detected static dataframe was updated!\"<\/span><span class=\"p\">)<\/span>\r\n            <span class=\"k\">print<\/span><span class=\"p\">(<\/span><span class=\"s\">\"restarting query\"<\/span><span class=\"p\">)<\/span>\r\n            <span class=\"k\">print<\/span><span class=\"p\">(<\/span><span class=\"s\">\"===================================================\"<\/span><span class=\"p\">)<\/span>\r\n            <span class=\"n\">launch<\/span><span class=\"p\">()<\/span>\r\n\r\n<\/code><\/pre>\n<p>\u8fd9\u662f\u4e00\u4e2a\u6709\u70b9\u68d8\u624b\u7684\u65b9\u6cd5\u3002<\/p>\n<p>\u5982\u679cthresholdDataFrame\u5f15\u7528\u7684HDFS\u6587\u4ef6\u4f7f\u7528mode(&#8220;overwrite&#8221;)\u6307\u5b9a\u4e86\u8def\u5f84\u6765\u8fdb\u884c\u8986\u76d6\u64cd\u4f5c\uff0c\u90a3\u4e48\u5728\u66f4\u65b0\u65f6\uff0c\u5982\u679c\u6ca1\u6709\u8c03\u7528persist\u65b9\u6cd5\u6765\u5bf9\u5df2\u52a0\u8f7d\u7684dataframe\u8fdb\u884c\u6301\u4e45\u5316\uff0c\u5c06\u4f1a\u53d1\u751f\u4ee5\u4e0b\u5f02\u5e38\u3002<\/p>\n<pre class=\"post-pre\"><code>Caused by: org.apache.spark.SparkException: Job aborted due to stage failure: Task 1 in stage 22.0 failed 1 times, most recent failure: Lost task 1.0 in stage 22.0 (TID 1440, localhost, executor driver): java.io.FileNotFoundException: File does not exist: hdfs:\/\/server\/path\/to\/part-00034-afcdb8cd-0d97-4a47-81fa-99540fdc6f0c-c000.snappy.parquet\r\nIt is possible the underlying files have been updated. You can explicitly invalidate the cache in Spark by running 'REFRESH TABLE tableName' command in SQL or by recreating the Dataset\/DataFrame involved.\r\n        at org.apache.spark.sql.execution.datasources.FileScanRDD$$anon$1.org$apache$spark$sql$execution$datasources$FileScanRDD$$anon$$readCurrentFile(FileScanRDD.scala:127)\r\n        at org.apache.spark.sql.execution.datasources.FileScanRDD$$anon$1.nextIterator(FileScanRDD.scala:177)\r\n<\/code><\/pre>\n<p>\u9019\u500b\u4f8b\u5916\u4e0d\u50c5\u50c5\u9069\u7528\u65bcStructuredStreaming\u3002<\/p>\n<pre class=\"post-pre\"><code>df=spark.read.parquet(\"hdfs:\/\/server\/path\/to\")\r\n# \u4ed6\u306e\u30bf\u30fc\u30df\u30ca\u30eb\u3067hdfs:\/\/server\/path\/to\u3092\u4e0a\u66f8\u304d\u3059\u308b\r\ndf.show()\r\n<\/code><\/pre>\n<p>\u5373\u4f7f\u8fdb\u884c\u7c7b\u4f3c\u5904\u7406\uff0c\u4e5f\u4f1a\u53d1\u751f\u76f8\u540c\u7684\u5f02\u5e38\u3002\u8fd9\u53ef\u80fd\u662f\u56e0\u4e3aRDD\u5904\u7406\u4e2d\u7684\u6587\u4ef6\u8bfb\u53d6\u88ab\u5ef6\u8fdf\u4e86\uff0c\u4f46\u5b9e\u9645\u4e0a\u5728spark.read\u7684\u65f6\u5019\uff0c\u5b83\u5df2\u7ecf\u5c06\u6587\u4ef6\u8def\u5f84\u7b49\u5143\u6570\u636e\u4f5c\u4e3a\u7f13\u5b58\u4fe1\u606f\u4fdd\u7559\u4e86\u4e0b\u6765\u3002<\/p>\n<p>\u5982\u679c\u60f3\u8981\u907f\u514d\u8fd9\u4e2a\u4f8b\u5916\u60c5\u51b5\uff0c\u53ea\u9700\u8981\u5728\u5199\u5165\u65f6\u4f7f\u7528mode(&#8220;append&#8221;)\uff0c\u4f46\u8fd9\u6837\u505a\u6587\u4ef6\u6240\u8868\u793a\u7684\u610f\u4e49\u4e5f\u4f1a\u53d1\u751f\u53d8\u5316\u3002<\/p>\n<p>\u53e6\u5916\uff0c\u5982\u679c\u8c03\u7528df.persist\uff0c\u5b83\u4f1a\u5c06\u5b9e\u9645\u6570\u636e\u521d\u59cb\u5316\u5e76\u6301\u4e45\u5316\uff0c\u8fd9\u6837\u5c31\u4e0d\u4f1a\u53d1\u751f\u5f02\u5e38\u3002<\/p>\n<p>\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u4f1a\u9006\u5411\u5229\u7528\u8fd9\u4e2a\u7279\u6027\uff0c\u6709\u610f\u8bf1\u53d1\u5e76\u6355\u83b7\u5f02\u5e38\uff0c\u5e76\u5728\u4ec5\u5f53\u53d1\u751f\u4e86\u7531\u4e8eHDFS\u6587\u4ef6\u66f4\u65b0\u800c\u5bfc\u81f4\u7684\u5f02\u5e38\u65f6\u5c1d\u8bd5\u91cd\u65b0\u542f\u52a8\u3002<\/p>\n<h1>\u54ea\u79cd\u66f4\u597d\uff1f<\/h1>\n<p>\u5c3d\u7ba1\u540e\u4e00\u79cd\u65b9\u6cd5\u53ef\u4ee5\u7acb\u5373\u5728\u6279\u91cf\u66f4\u65b0\u65f6\u8fdb\u884c\u53cd\u6620\uff0c\u4f46\u4ece\u8bbe\u8ba1\u89d2\u5ea6\u6765\u770b\u5e76\u4e0d\u53ef\u53d6\uff0c\u4e0d\u80fd\u4f7f\u7528persist\uff0c\u57fa\u672c\u4e0a\u9009\u62e9\u524d\u4e00\u79cd\u65b9\u6cd5\u5c31\u597d\u4e86\u5427\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9996\u5148 \u5728Structured Streaming\u4e2d\uff0c\u6211\u4eec\u6b63\u5728\u901a\u8fc7Kafka\u63a5\u6536\u6d41\u6570\u636e\u5e76\u4e0e\u5b58\u50a8\u5728HDFS\u4e0a\u7684\u8868\u8fdb [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-46890","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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