{"id":47147,"date":"2023-03-08T07:18:00","date_gmt":"2023-11-19T17:25:53","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e5%af%b9avro%e8%bf%9b%e8%a1%8c%e4%ba%86%e8%b0%83%e6%9f%a5\/"},"modified":"2024-04-29T17:53:01","modified_gmt":"2024-04-29T09:53:01","slug":"%e6%88%91%e5%af%b9avro%e8%bf%9b%e8%a1%8c%e4%ba%86%e8%b0%83%e6%9f%a5","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e5%af%b9avro%e8%bf%9b%e8%a1%8c%e4%ba%86%e8%b0%83%e6%9f%a5\/","title":{"rendered":"\u6211\u5bf9Avro\u8fdb\u884c\u4e86\u8c03\u67e5"},"content":{"rendered":"<p>\u6211\u505a\u4e86\u4e00\u4e9b\u5173\u4e8eApache Avro\u7684\u8c03\u67e5\u3002\u7531\u4e8e\u6709\u5f88\u591a\u5730\u65b9\u6211\u4e0d\u592a\u7406\u89e3\uff0c\u6240\u4ee5\u5982\u679c\u6709\u4efb\u4f55\u6307\u6b63\u6216\u8bc4\u8bba\uff0c\u8bf7\u52a1\u5fc5\u7559\u8a00\u3002<\/p>\n<h1>1. 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Buffers\u4e4b\u95f4\u7684\u5dee\u5f02\uff0c\u5341\u5206\u6613\u4e8e\u7406\u89e3\u3002<\/p>\n<p>\u5173\u4e8eC\u3001C++\u3001C#\u3001Java\u3001PHP\u3001Python\u548cRuby\uff0c\u5b98\u65b9\u90fd\u6709\u76f8\u5e94\u7684\u5e93\u53ef\u7528\uff0c\u4f46\u662f\u6839\u636e\u8bed\u8a00\u7684\u4e0d\u540c\uff0c\u5bf9\u4e8e(\u7279\u522b\u662f\u65b0\u529f\u80fd\u65b9\u9762\u7684)\u652f\u6301\u7a0b\u5ea6\u4f3c\u4e4e\u7565\u6709\u5dee\u5f02\u3002\u6211\u8ba4\u4e3aGo\u8bed\u8a00\u4e3b\u8981\u4f7f\u7528linkedin\/goavro\u3002\u4ee5\u4e0b\u8bf4\u660e\u662f\u4ee5Java\u4e3a\u57fa\u7840\u7684\u3002<\/p>\n<h1>2. \u4e3b\u8981\u529f\u80fd<\/h1>\n<h2>2.1 \u6570\u636e\u6a21\u5f0f\u5b9a\u4e49<\/h2>\n<p>\u5728avsc\u6587\u4ef6\u4e2d\u5b9a\u4e49\u6a21\u5f0f\u3002\u63d0\u4f9b\u4e86\u4ee5\u4e0b\u6570\u636e\u7c7b\u578b\uff0c\u53ef\u4ee5\u7ec4\u5408\u6765\u5b9a\u4e49\u5b57\u6bb5\u3002\u5c3d\u7ba1\u7a0d\u65e7\uff0c\u4f46\u53c2\u8003Oracle NoSQL\u6570\u636e\u5e93\u8d77\u6b65\u6307\u5357\u7684\u7b2c7\u7ae0Avro\u6a21\u5f0f\u7684\u65e5\u6587\u6587\u6863\u3002<\/p>\n<div>\n<div class=\"post-table\">\u7a2e\u985e\u30c7\u30fc\u30bf\u578bPrimitive Typesnull, boolean, int, long, float, double, bytes, stringComplex Typesrecord, enum, array, maps, union, fixedLogical TypesDecimal, Date, Time, Timestamp, Duration<\/div>\n<\/div>\n<p>Logical Type\u662f\u4e00\u79cd\u6d3e\u751f\u7c7b\u578b\uff0c\u5b83\u4ee5Primitive Type\u4f5c\u4e3a\u7269\u7406\u5f62\u5f0f\u8fdb\u884c\u5e8f\u5217\u5316\u3002<\/p>\n<p>\u9664\u4e86\u53ef\u4ee5\u4f7f\u7528JSON\u683c\u5f0f\u6765\u63cf\u8ff0\u6a21\u5f0f\u4e4b\u5916\uff0c\u8fd8\u53ef\u4ee5\u901a\u8fc7IDL\u6765\u521b\u5efa\u6a21\u5f0f\u3002\u4f7f\u7528IDL\u53ef\u4ee5\u4f7f\u7528import\u7b49\u529f\u80fd\u3002<\/p>\n<h3>2.1.1 \u793a\u4f8b\u6a21\u5f0f\u7684\u4f8b\u5b50<\/h3>\n<p>\u4ecehttp:\/\/avro.apache.org\/docs\/current\/spec.html\u83b7\u53d6<\/p>\n<pre class=\"post-pre\"><code>{\"namespace\": \"example.avro\",\r\n \"type\": \"record\",\r\n \"name\": \"User\",\r\n \"fields\": [\r\n     {\"name\": \"name\", \"type\": \"string\"},\r\n     {\"name\": \"favorite_number\",  \"type\": [\"int\", \"null\"]},\r\n     {\"name\": \"favorite_color\", \"type\": [\"string\", \"null\"]}\r\n ]\r\n<\/code><\/pre>\n<h3>2.1.2 \u4ee5 IDL \u8fdb\u884c\u6a21\u5f0f\u5b9a\u4e49\u7684\u793a\u4f8b<\/h3>\n<p>\u4eceAvroHubTool\u6839\u636eAvro IDL\u5408\u6210Avro schema\u3002<\/p>\n<p>(Note: The provided link appears to be written in Japanese, not Chinese.)<\/p>\n<pre class=\"post-pre\"><code>@namespace(\"avro.examples.baseball\")\r\nprotocol Baseball {\r\n   import schema \"name.avsc\";\r\n   import schema \"coache.avsc\";\r\n   import schema \"position.avsc\";\r\n   import schema \"player.avsc\";\r\n\r\n   record Team {\r\n       Player player;\r\n       Coache  coache;\r\n  }\r\n}\r\n<\/code><\/pre>\n<h3>2.1.3 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class=\"post-table\">\u4e92\u63db\u6027\u306e\u7a2e\u985e\u8aac\u660e\u524d\u65b9\u4e92\u63db\u65b0\u3057\u3044\u30b9\u30ad\u30fc\u30de\u3067\u4f5c\u3089\u308c\u305f\u30c7\u30fc\u30bf\u3092\u53e4\u3044\u30b9\u30ad\u30fc\u30de\u3067\u8aad\u3080\u5f8c\u65b9\u4e92\u63db\u53e4\u3044\u30b9\u30ad\u30fc\u30de\u3067\u4f5c\u6210\u3055\u308c\u305f\u30c7\u30fc\u30bf\u3092\u65b0\u3057\u3044\u30b9\u30ad\u30fc\u30de\u3067\u8aad\u3080<\/div>\n<\/div>\n<p>\u4e3a\u4e86\u4fdd\u6301\u524d\u5411\u517c\u5bb9\u6027\uff0c\u5728\u5411\u6a21\u5f0f\u4e2d\u6dfb\u52a0\u5217\u65f6\u9700\u8981\u6307\u5b9a\u9ed8\u8ba4\u503c\u3002<\/p>\n<h2>2.2 \u6570\u636e\u683c\u5f0f<\/h2>\n<p>Avro\u63d0\u4f9b\u4e86\u4e09\u79cd\u6570\u636e\u683c\u5f0f\uff0c\u53ef\u4ee5\u6839\u636e\u7528\u9014\u8fdb\u884c\u9009\u62e9\u3002\u7531\u4e8e\u8bfb\u5199\u6570\u636e\u9700\u8981\u6a21\u5f0f\uff0c\u56e0\u6b64\u9700\u8981\u8003\u8651\u5934\u90e8\u5f00\u9500\u548c\u6a21\u5f0f\u7ba1\u7406\u6765\u8fdb\u884c\u51b3\u7b56\u3002<\/p>\n<div>\n<div class=\"post-table\">\u7a2e\u985e\u5185\u5bb9\u8aac\u660e\u30b9\u30ad\u30fc\u30de\u306e\u904b\u7528Binary Encoding\u30d0\u30a4\u30ca\u30ea\u306e\u30c7\u30fc\u30bf\u306e\u307f\u3001\u30d8\u30c3\u30c0\u306a\u3057BinaryEncoder\u3092\u4f7f\u3046\u3002\u5358\u7d14\u306a\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3068\u3057\u3066\u306e\u307f\u4f7f\u7528\u3059\u308b\u5834\u5408\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3084\u30c8\u30d4\u30c3\u30af\u3068\u30b9\u30ad\u30fc\u30de\u3092\u898f\u7d04\u3067\u5bfe\u5fdc\u4ed8\u3051\u3066\u304a\u304f\u3002\u30b9\u30ad\u30fc\u30de\u66f4\u65b0\u6642\u306f\u5168\u4f53\u3067\u540c\u671f\u3092\u3068\u3063\u3066\u5bfe\u5fdc\u304c\u5fc5\u8981Object Container Files\u30d8\u30c3\u30c0\u306b\u30b9\u30ad\u30fc\u30de\u5b9a\u7fa9\u3092\u542b\u3080DataFileWriter\u3092\u4f7f\u3046\u3002\u30d5\u30a1\u30a4\u30eb\u3067\u306e\u30c7\u30fc\u30bf\u4ea4\u63db\u7528\u57cb\u3081\u8fbc\u307e\u308c\u3066\u3044\u308b\u30b9\u30ad\u30fc\u30de\u3092\u305d\u306e\u307e\u307e\u5229\u7528\u53ef\u80fdSingle-Object Encoding\u30d8\u30c3\u30c0\u306b\u30b9\u30ad\u30fc\u30de\u306e\u30d5\u30a3\u30f3\u30ac\u30fc\u30d7\u30ea\u30f3\u30c8\u3092\u542b\u3080BinaryMessageEncoder\u3092\u4f7f\u3046\u3002Kafka\u306a\u3069\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u30f3\u30b0\u7528\u30d5\u30a3\u30f3\u30ac\u30fc\u30d7\u30ea\u30f3\u30c8\u3092\u4f7f\u7528\u3057\u3066\u30b9\u30ad\u30fc\u30de\u3092\u89e3\u6c7a\u3059\u308b<\/div>\n<\/div>\n<p>Object Container Files\uff08OCF\uff09\u7684\u683c\u5f0f\u53ef\u4ee5\u8fdb\u884cdeflate\/snappy\u538b\u7f29\u3002\u6b64\u5916\uff0c\u5b83\u8fd8\u88abBigQuery\u3001RedShift\u3001Spark\u7b49\u652f\u6301\u3002\u60a8\u8fd8\u53ef\u4ee5\u52a0\u8f7dAmazon 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\u7528\u4e8e\u5e8f\u5217\u5316\u7684\u4e3b\u8981\u7c7b<\/h2>\n<p>\u57fa\u672c\u4e0a\uff0c\u53ef\u4ee5\u4f7f\u7528DatumWriter\u7684\u4efb\u4f55\u5b50\u7c7b\u4ee5\u53caEncoder\u6216FileWriter\u8fdb\u884c\u5e8f\u5217\u5316\u3002\u5e8f\u5217\u5316\u7684\u793a\u4f8b\u8bf7\u53c2\u8003Getting Started (Java)\u3002\u5728\u53cd\u5e8f\u5217\u5316\u4e2d\uff0c\u4f7f\u7528\u76f8\u5e94\u7684Reader\/Decoder\u3002<\/p>\n<p>\u8fd9\u4e2a\u7ae0\u8282\u662f\u300aOracle NoSQL Database\u5165\u95e8\u6307\u5357\u300b\u7684\u7b2c8\u7ae0\uff0c\u867d\u7136\u7565\u5fae\u9648\u65e7\uff0c\u4f46\u6709\u5173Avro\u7ed1\u5b9a\u7684\u65e5\u8bed\u6587\u6863\u53ef\u5728\u8fd9\u91cc\u627e\u5230\u3002<\/p>\n<div>\n<div class=\"post-table\">packageclass\/Interface\u8aac\u660eorg.apache.avro.ioDatumWriter(IF)\u30b9\u30ad\u30fc\u30de\u306b\u5f93\u3063\u3066\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092Encoder\u306b\u66f8\u304d\u51fa\u3059org.apache.avro.ioSpecificDatumWriter\u30b9\u30ad\u30fc\u30de\u304b\u3089\u81ea\u52d5\u751f\u6210\u3055\u308c\u305f\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u30b7\u30ea\u30a2\u30e9\u30a4\u30baorg.apache.avro.ioGenericDatumWriter\u30af\u30e9\u30b9\u306e\u81ea\u52d5\u751f\u6210\u3092\u4f7f\u308f\u305a\u306b\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3059\u308borg.apache.avro.ioReflectDatumWriter\u65e2\u5b58\u306e\u30af\u30e9\u30b9\u3092\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3059\u308borg.apache.avro.ioEncoder(IF)\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5024\u3092\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3059\u308borg.apache.avro.ioBinaryEncoder\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5024\u3092\u30d0\u30a4\u30ca\u30ea\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3059\u308borg.apache.avro.fileDataFileWriterDatumWriter\u3092Object 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