{"id":36437,"date":"2023-09-03T05:47:01","date_gmt":"2024-02-27T13:37:40","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/apache-spark-%e5%85%b3%e4%ba%8e%e5%88%86%e5%8c%ba%e7%9a%84%e5%86%85%e5%ae%b9\/"},"modified":"2024-04-30T21:20:12","modified_gmt":"2024-04-30T13:20:12","slug":"apache-spark-%e5%85%b3%e4%ba%8e%e5%88%86%e5%8c%ba%e7%9a%84%e5%86%85%e5%ae%b9","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/apache-spark-%e5%85%b3%e4%ba%8e%e5%88%86%e5%8c%ba%e7%9a%84%e5%86%85%e5%ae%b9\/","title":{"rendered":"Apache Spark – \u5173\u4e8e\u5206\u533a\u7684\u5185\u5bb9 –"},"content":{"rendered":"

\u9996\u5148<\/h1>\n

\u9019\u7bc7\u6587\u7ae0\u8a66\u5716\u901a\u904e\u8209\u4f8b\u4f86\u7e3d\u7d50Apache Spark\u7684\u5206\u5340\u6982\u5ff5\u3002
\n\u6709\u95dcApache Spark\u7684\u6982\u8ff0\uff0c\u8acb\u53c3\u95b1”Apache Spark \u9032\u884c\u5206\u6563\u8655\u7406\u5165\u9580”\u3002<\/p>\n

\u901a\u8fc7\u4f8b\u9898\u6765\u4e86\u89e3\u5206\u533a\u7684\u6982\u5ff5\u548c\u64cd\u4f5c\u65b9\u6cd5\u3002<\/h1>\n

\u4ee5\u4e0b\u662f\u7528Apache Spark\u6f14\u793a\u5206\u5e03\u5904\u7406\u7684\u793a\u4f8b\u56fe\u89e3\u3002
\n\u9996\u5148\u4ecb\u7ecd\u4e86\u4f7f\u7528\u7684\u51fd\u6570\u8bf4\u660e\uff0c\u63a5\u7740\u662f\u5904\u7406\u7684\u56fe\u50cf\uff0c\u6700\u540e\u6309\u6e90\u4ee3\u7801\u7684\u987a\u5e8f\u8fdb\u884c\u4ecb\u7ecd\u3002
\n\u4ecb\u7ecd\u4e86\u4f7f\u7528\u4e0d\u540c\u5206\u533a\u65b9\u5f0f\u7684\u4e09\u4e2a\u4f8b\u5b50\uff1a
\n– filter\u51fd\u6570\u7684\u4f8b\u5b50
\n– flatmap\u51fd\u6570\u7684\u4f8b\u5b50
\n– reduceByKey\u51fd\u6570\u7684\u4f8b\u5b50<\/p>\n

filter\u51fd\u6570\u7684\u793a\u4f8b<\/h2>\n

\u5728\u8fdb\u884c\u8981\u7d20\u5355\u4f4d\u8f6c\u6362\u65f6\uff0c\u53ef\u4f7f\u7528map()\u548cfilter\u7b49\u65b9\u6cd5\u3002<\/p>\n

\n
\u95a2\u6570\u8aac\u660emap()\u5f15\u6570\u306b\u95a2\u6570\u3092\u4e00\u3064\u53d6\u308a\u3001\u305d\u306e\u95a2\u6570\u3092RDD\u5185\u306e\u5404\u8981\u7d20\u306b\u9069\u5fdc\u3057\u3001\u305d\u306e\u7d50\u679c\u3092\u65b0\u3057\u3044\u5024\u3068\u3059\u308bRDD\u3092\u8fd4\u3059filter()\u5f15\u6570\u306b\u95a2\u6570\u3092\u4e00\u3064\u53d6\u308a\u3001\u305d\u306e\u30d5\u30a3\u30eb\u30bf\u95a2\u6570\u304c\u771f\u306b\u306a\u308b\u8981\u7d20\u3060\u3051\u3092\u542b\u3080RDD\u3092\u8fd4\u3059<\/div>\n<\/div>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n

\u6e90\u4ee3\u7801\u5728\u8fd9\u91cc<\/p>\n

package<\/span> other<\/span>;<\/span>\r\n\r\nimport<\/span> org.apache.spark.api.java.JavaRDD<\/span>;<\/span>\r\nimport<\/span> org.apache.spark.api.java.JavaSparkContext<\/span>;<\/span>\r\n\r\n\/**\r\n * Created by hirokinaganuma on 2016\/10\/11.\r\n *\/<\/span>\r\npublic<\/span> class<\/span> Sample02<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> throws<\/span> Exception<\/span> {<\/span>\r\n        String<\/span> master<\/span>;<\/span>\r\n        if<\/span> (<\/span>args<\/span>.<\/span>length<\/span> ><\/span> 0<\/span>)<\/span> {<\/span>\r\n            master<\/span> =<\/span> args<\/span>[<\/span>0<\/span>];<\/span>\r\n        }<\/span> else<\/span> {<\/span>\r\n            master<\/span> =<\/span> \"local\"<\/span>;<\/span>\r\n        }<\/span>\r\n        JavaSparkContext<\/span> sc<\/span> =<\/span> new<\/span> JavaSparkContext<\/span>(<\/span>master<\/span>,<\/span> \"basicavg\"<\/span>,<\/span> System<\/span>.<\/span>getenv<\/span>(<\/span>\"SPARK_HOME\"<\/span>),<\/span> System<\/span>.<\/span>getenv<\/span>(<\/span>\"JARS\"<\/span>));<\/span>\r\n        JavaRDD<\/span><<\/span>String<\/span>><\/span> input<\/span> =<\/span> sc<\/span>.<\/span>textFile<\/span>(<\/span>\"bin\/input\/*.txt\"<\/span>);<\/span>\r\n        JavaRDD<\/span><<\/span>String<\/span>><\/span> result<\/span> =<\/span> input<\/span>.<\/span>filter<\/span>(<\/span>s<\/span>-><\/span> !<\/span>s<\/span>.<\/span>contains<\/span>(<\/span>\"Triangle\"<\/span>));<\/span>\r\n        result<\/span>.<\/span>saveAsTextFile<\/span>(<\/span>\"bin\/output\/output02\"<\/span>);<\/span>\r\n        sc<\/span>.<\/span>stop<\/span>();<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
Rectangle\r\nCircle\r\nTriangle\r\n<\/code><\/pre>\n
Circle\r\nRectangle\r\nTriangle\r\n<\/code><\/pre>\n
Triangle\r\nRectangle\r\n<\/code><\/pre>\n
RDD\u662f\u4e00\u79cd\u5206\u5e03\u5f0f\u96c6\u5408\uff0c\u53ef\u4ee5\u4fdd\u5b58\u5927\u91cf\u7684\u6570\u636e\u5143\u7d20\u3002RDD\u662f\u8bbe\u8ba1\u7528\u4e8e\u5728\u7531\u591a\u53f0\u673a\u5668\u7ec4\u6210\u7684\u96c6\u7fa4\u4e0a\u8fdb\u884c\u5206\u5e03\u5f0f\u5904\u7406\u7684\uff0c\u5728\u5185\u90e8\u88ab\u5212\u5206\u4e3a\u591a\u4e2a\u5757\uff0c\u79f0\u4e3apartition\u3002\u5728Spark\u4e2d\uff0cpartition\u6210\u4e3a\u5206\u5e03\u5f0f\u5904\u7406\u7684\u5355\u4f4d\u3002\u901a\u8fc7\u5728\u6bcf\u4e2apartition\u4e0a\u5728\u591a\u53f0\u673a\u5668\u4e0a\u8fdb\u884c\u5904\u7406\uff0c\u53ef\u4ee5\u5904\u7406\u65e0\u6cd5\u5728\u5355\u4e2a\u673a\u5668\u4e0a\u5904\u7406\u7684\u6570\u636e\u3002<\/p>\n
\u5c06\u88ab\u5206\u5272\u7684\u6587\u4ef6\u4f5c\u4e3a\u4e00\u4e2aRDD\u6765\u5904\u7406\uff0c\u53ea\u9700\u7f16\u5199input.filter(s -> !s.contains(“Triangle”))\uff0c\u5373\u53ef\u5b9e\u73b0\u65e0\u9700\u5206\u5e03\u5f0f\u610f\u8bc6\u7684\u7f16\u7a0b\u3002<\/p>\n
flatMap\u51fd\u6570\u7684\u793a\u4f8b<\/h2>\n
\u6b64\u51fd\u6570\u662f\u4ece\u4e00\u4e2a\u5143\u7d20\u751f\u6210\u591a\u4e2a\u5143\u7d20\u7684\u4e00\u5bf9\u591a\u5173\u7cfb\u8f6c\u6362\uff0c\u800c\u4e0d\u662f\u50cf filter \u548c map \u51fd\u6570\u4e00\u6837\u662f\u4e00\u5bf9\u4e00\u7684\u5173\u7cfb\u3002<\/p>\n
\n
\u95a2\u6570\u8aac\u660eflatMap()\u5f15\u6570\u306b\u95a2\u6570\u3092\u4e00\u3064\u53d6\u308a\u3001\u305d\u306e\u95a2\u6570\u3092RDD\u5185\u306e\u5404\u8981\u7d20\u306b\u9069\u5fdc\u3057\u3066\u547c\u3070\u308c\u308b\u304c\u3001\u3053\u306e\u95a2\u6570\u306f\u305d\u306e\u7d50\u679c\u3092\u8fd4\u3059Iterator\u3092\u8fd4\u3057\u307e\u3059\u3002\u305d\u308c\u3089\u306eIterator\u5168\u3066\u304b\u3089\u8fd4\u3055\u308c\u305f\u8981\u7d20\u3092\u5024\u3068\u3059\u308bRDD\u3092\u6700\u512a\u7684\u306b\u8fd4\u3057\u307e\u3059<\/div>\n<\/div>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
\u6e90\u4ee3\u7801\u5728\u8fd9\u91cc\u3002<\/p>\n
import<\/span> org.apache.spark.api.java.JavaRDD<\/span>;<\/span>\r\nimport<\/span> org.apache.spark.api.java.JavaSparkContext<\/span>;<\/span>\r\nimport<\/span> org.apache.spark.api.java.function.FlatMapFunction<\/span>;<\/span>\r\n\r\nimport<\/span> java.util.Arrays<\/span>;<\/span>\r\n\r\n\/**\r\n * Created by hirokinaganuma on 2016\/10\/11.\r\n *\/<\/span>\r\npublic<\/span> class<\/span> Sample03<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> throws<\/span> Exception<\/span> {<\/span>\r\n        String<\/span> master<\/span>;<\/span>\r\n        if<\/span> (<\/span>args<\/span>.<\/span>length<\/span> ><\/span> 0<\/span>)<\/span> {<\/span>\r\n            master<\/span> =<\/span> args<\/span>[<\/span>0<\/span>];<\/span>\r\n        }<\/span> else<\/span> {<\/span>\r\n            master<\/span> =<\/span> \"local\"<\/span>;<\/span>\r\n        }<\/span>\r\n        JavaSparkContext<\/span> sc<\/span> =<\/span> new<\/span> JavaSparkContext<\/span>(<\/span>master<\/span>,<\/span> \"basicavg\"<\/span>,<\/span> System<\/span>.<\/span>getenv<\/span>(<\/span>\"SPARK_HOME\"<\/span>),<\/span> System<\/span>.<\/span>getenv<\/span>(<\/span>\"JARS\"<\/span>));<\/span>\r\n        JavaRDD<\/span><<\/span>String<\/span>><\/span> input<\/span> =<\/span> sc<\/span>.<\/span>textFile<\/span>(<\/span>\"bin\/input\/flatmap\/*.txt\"<\/span>);<\/span>\r\n        JavaRDD<\/span><<\/span>String<\/span>><\/span> result<\/span> =<\/span> input<\/span>.<\/span>flatMap<\/span>(<\/span>\r\n                new<\/span> FlatMapFunction<\/span><<\/span>String<\/span>,<\/span> String<\/span>>()<\/span> {<\/span>\r\n                    public<\/span> Iterable<\/span><<\/span>String<\/span>><\/span> call<\/span>(<\/span>String<\/span> x<\/span>)<\/span> {<\/span>\r\n                        return<\/span> Arrays<\/span>.<\/span>asList<\/span>(<\/span>x<\/span>.<\/span>split<\/span>(<\/span>\" \"<\/span>));<\/span>\r\n                    }<\/span>\r\n                }<\/span>\r\n        );<\/span>\r\n        result<\/span>.<\/span>saveAsTextFile<\/span>(<\/span>\"bin\/output\/output03\"<\/span>);<\/span>\r\n        sc<\/span>.<\/span>stop<\/span>();<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
I am from Fukuoka\r\nHello Apache Spark\r\n<\/code><\/pre>\n
Tokyo Institute of Technology\r\n<\/code><\/pre>\n
reduceByKey\u51fd\u6570\u7684\u793a\u4f8b<\/h2>\n
reduceByKey\u662f\u4e00\u500b\u9700\u8981\u4ee5\u524d\u7684RDD\u4e2d\u7684\u5143\u7d20\u8207\u5176\u4ed6\u5206\u7247\u4e2d\u7684\u5143\u7d20\u9032\u884c\u6574\u5408\u8655\u7406\u7684\u64cd\u4f5c\u3002\u9019\u500b\u8f49\u63db\u91dd\u5c0d\u7684\u662f\u4e00\u500b\u7531\u9375\u503c\u5c0d\u5143\u7d20\u7d44\u6210\u7684RDD\uff0c\u5b83\u5c07\u5177\u6709\u76f8\u540c\u9375\u7684\u5143\u7d20\u9032\u884c\u5408\u4f75\u8655\u7406\u3002Spark\u6309\u7167\u6bcf\u500b\u5206\u7247\u7368\u7acb\u9032\u884c\u5206\u6563\u8655\u7406\uff0c\u6240\u4ee5\u5177\u6709\u76f8\u540c\u9375\u7684\u5143\u7d20\u5fc5\u9808\u5b8c\u5168\u5305\u542b\u5728\u540c\u4e00\u500b\u5206\u7247\u4e2d\u3002\u56e0\u6b64\uff0c\u5728reduce\u64cd\u4f5c\u4e4b\u524d\u9700\u8981\u9032\u884c\u91cd\u5206\u4f48(shuffle)\u3002\u91cd\u5206\u4f48\u64cd\u4f5c\u6839\u64da\u9375\u5c07\u8fd4\u9084\u524d\u7684RDD\u5143\u7d20\u91cd\u65b0\u5206\u914d\u5230\u8f49\u63db\u5f8c\u7684RDD\u5206\u7247\u4e2d\u3002\u56e0\u6b64\uff0c\u91cd\u5206\u4f48\u53ef\u4ee5\u4fdd\u8b49\u5177\u6709\u76f8\u540c\u9375\u7684\u5143\u7d20\u88ab\u5305\u542b\u5728\u540c\u4e00\u500b\u5206\u7247\u4e2d\u3002<\/p>\n
\u5716\u4e2d\u6c92\u6709\u8868\u9054\u51fa\u4f86\uff0c\u4f46\u662f\u5728\u9032\u884c\u91cd\u5206\u4f48\u4e4b\u524d\uff0c\u5728\u6bcf\u500b\u5206\u7247\u5167\u90e8\u57f7\u884c\u4e86reduce\u64cd\u4f5c\uff0c\u4ee5\u6e1b\u5c11\u901a\u4fe1\u6210\u672c\u3002<\/p>\n
\n
\u95a2\u6570\u8aac\u660ereduceByKey()\u5f15\u6570\u306b\u95a2\u6570\u3092\u4e00\u3064\u53d6\u308a\u3001\u305d\u306e\u95a2\u6570\u306f\u540c\u3058\u30ad\u30fc\u306e\u5024\u3092\u7d50\u5408\u3059\u308b\u969b\u306ereduce\u51e6\u7406\u3067\u3042\u308b<\/div>\n<\/div>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
\u6e90\u4ee3\u7801\u5728\u8fd9\u91cc\u3002<\/p>\n
import<\/span> org.apache.spark.api.java.JavaPairRDD<\/span>;<\/span>\r\nimport<\/span> org.apache.spark.api.java.JavaRDD<\/span>;<\/span>\r\nimport<\/span> org.apache.spark.api.java.JavaSparkContext<\/span>;<\/span>\r\nimport<\/span> org.apache.spark.api.java.function.FlatMapFunction<\/span>;<\/span>\r\nimport<\/span> org.apache.spark.api.java.function.Function2<\/span>;<\/span>\r\nimport<\/span> org.apache.spark.api.java.function.PairFunction<\/span>;<\/span>\r\nimport<\/span> scala.Tuple2<\/span>;<\/span>\r\n\r\nimport<\/span> java.util.Arrays<\/span>;<\/span>\r\n\r\n\/**\r\n * Created by hirokinaganuma on 2016\/10\/11.\r\n *\/<\/span>\r\npublic<\/span> class<\/span> Sample04<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> throws<\/span> Exception<\/span> {<\/span>\r\n        String<\/span> master<\/span>;<\/span>\r\n        if<\/span> (<\/span>args<\/span>.<\/span>length<\/span> ><\/span> 0<\/span>)<\/span> {<\/span>\r\n            master<\/span> =<\/span> args<\/span>[<\/span>0<\/span>];<\/span>\r\n        }<\/span> else<\/span> {<\/span>\r\n            master<\/span> =<\/span> \"local\"<\/span>;<\/span>\r\n        }<\/span>\r\n        JavaSparkContext<\/span> sc<\/span> =<\/span> new<\/span> JavaSparkContext<\/span>(<\/span>master<\/span>,<\/span> \"basicavg\"<\/span>,<\/span> System<\/span>.<\/span>getenv<\/span>(<\/span>\"SPARK_HOME\"<\/span>),<\/span> System<\/span>.<\/span>getenv<\/span>(<\/span>\"JARS\"<\/span>));<\/span>\r\n        JavaRDD<\/span><<\/span>String<\/span>><\/span> input<\/span> =<\/span> sc<\/span>.<\/span>textFile<\/span>(<\/span>\"bin\/input\/reducebykey\/*.txt\"<\/span>);<\/span>\r\n        JavaRDD<\/span><<\/span>String<\/span>><\/span> words<\/span> =<\/span> input<\/span>.<\/span>flatMap<\/span>(<\/span>\r\n                new<\/span> FlatMapFunction<\/span><<\/span>String<\/span>,<\/span> String<\/span>>()<\/span> {<\/span>\r\n                    public<\/span> Iterable<\/span><<\/span>String<\/span>><\/span> call<\/span>(<\/span>String<\/span> x<\/span>)<\/span> {<\/span>\r\n                        return<\/span> Arrays<\/span>.<\/span>asList<\/span>(<\/span>x<\/span>.<\/span>split<\/span>(<\/span>\" \"<\/span>));<\/span>\r\n                    }<\/span>\r\n                }<\/span>\r\n        );<\/span>\r\n\r\n        JavaPairRDD<\/span><<\/span>String<\/span>,<\/span> Integer<\/span>><\/span> pairrdd<\/span> =<\/span> words<\/span>.<\/span>mapToPair<\/span>(<\/span>\r\n                new<\/span> PairFunction<\/span><<\/span>String<\/span>,<\/span> String<\/span>,<\/span> Integer<\/span>>(){<\/span>\r\n                    public<\/span> Tuple2<\/span><<\/span>String<\/span>,<\/span> Integer<\/span>><\/span> call<\/span>(<\/span>String<\/span> x<\/span>){<\/span>\r\n                        return<\/span> new<\/span> Tuple2<\/span>(<\/span>x<\/span>,<\/span> 1<\/span>);<\/span>\r\n                    }<\/span>\r\n                }<\/span>\r\n        );<\/span>\r\n\r\n        JavaPairRDD<\/span><<\/span>String<\/span>,<\/span> Integer<\/span>><\/span> output<\/span> =<\/span> pairrdd<\/span>.<\/span>reduceByKey<\/span>(<\/span>new<\/span> Function2<\/span><<\/span>Integer<\/span>,<\/span> Integer<\/span>,<\/span> Integer<\/span>>(){<\/span>\r\n            public<\/span> Integer<\/span> call<\/span>(<\/span>Integer<\/span> x<\/span>,<\/span> Integer<\/span> y<\/span>){<\/span>\r\n                return<\/span> x<\/span>+<\/span>y<\/span>;<\/span>\r\n            }<\/span>\r\n        });<\/span>\r\n\r\n        output<\/span>.<\/span>saveAsTextFile<\/span>(<\/span>\"bin\/output\/output04\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
fish\r\ncat\r\n<\/code><\/pre>\n
cat\r\nfish\r\n<\/code><\/pre>\n
fish\r\n<\/code><\/pre>\n
cat\r\ncat\r\ndog\r\n<\/code><\/pre>\n
Apache Spark\u7684partition\u662f\u4ec0\u4e48\u610f\u601d\uff1f<\/h1>\n
RDD\u662f\u4e00\u79cd\u5206\u5e03\u5f0f\u96c6\u5408\uff0c\u4ee5\u5927\u91cf\u6570\u636e\u4f5c\u4e3a\u5143\u7d20\u3002RDD\u662f\u5728\u7531\u591a\u53f0\u673a\u5668\u7ec4\u6210\u7684\u96c6\u7fa4\u4e0a\u8fdb\u884c\u5206\u5e03\u5f0f\u5904\u7406\u8bbe\u8ba1\u7684\uff0c\u5185\u90e8\u88ab\u5206\u5272\u6210\u4e86\u79f0\u4e3apartition\u7684\u5757\u3002\u5728Spark\u4e2d\uff0cpartition\u6210\u4e3a\u4e86\u5206\u5e03\u5f0f\u5904\u7406\u7684\u5355\u4f4d\u3002\u901a\u8fc7\u5728\u6bcf\u4e2apartition\u4e0a\u591a\u53f0\u673a\u5668\u4e0a\u5904\u7406RDD\uff0c\u53ef\u4ee5\u5904\u7406\u65e0\u6cd5\u5728\u5355\u53f0\u673a\u5668\u4e0a\u5904\u7406\u7684\u6570\u636e\u3002<\/p>\n
\u58eb\u6c14<\/h2>\n
\u5728\u5206\u6563\u8ba1\u7b97\u4e2d\uff0c\u901a\u4fe1\u6210\u672c\u975e\u5e38\u9ad8\uff0c\u6700\u5c0f\u5316\u7f51\u7edc\u6d41\u91cf\u53ef\u4ee5\u5927\u5e45\u63d0\u5347\u6027\u80fd\u3002
\n\u4e3a\u4e86\u51cf\u5c11\u901a\u4fe1\u91cf\uff0c\u9700\u8981\u901a\u8fc7\u63a7\u5236RDD\u7684\u5206\u533a\u6765\u4f18\u5316Spark\u7a0b\u5e8f\u3002<\/p>\n
\u4f8b\u5982\uff0cSpark\u53ef\u4ee5\u901a\u8fc7\u7f16\u7a0b\u6765\u786e\u4fdd\u952e\u7684\u96c6\u5408\u51fa\u73b0\u5728\u96c6\u4e2d\u7684\u8282\u70b9\u4e0a\uff08\u901a\u8fc7reduceByKey()\u8fdb\u884c\u4ecb\u7ecd\uff09\u3002\u7279\u522b\u662f\u5728\u6570\u636e\u96c6\u591a\u6b21\u91cd\u7528\u952e\u64cd\u4f5c\uff08\u5982\u8fde\u63a5\uff09\u7684\u60c5\u51b5\u4e0b\uff0c\u5206\u533a\u662f\u5f88\u6709\u7528\u7684\u3002\u8fd9\u662f\u56e0\u4e3aSpark\u7684\u8bb8\u591a\u64cd\u4f5c\u90fd\u4f1a\u901a\u8fc7\u7f51\u7edc\u8fdb\u884c\u57fa\u4e8e\u952e\u7684\u6d17\u724c\u3002\u5b83\u4eec\u90fd\u53ef\u4ee5\u53d7\u76ca\u4e8e\u5206\u533a\u3002<\/p>\n
\u6570\u636e\u7684\u5206\u533a<\/h2>\n
\u5728Java\u6216Scala\u4e2d\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528partitioner\u5c5e\u6027\u6765\u6307\u5b9aRDD\u7684\u5206\u533a\u65b9\u6cd5\u3002\u5728spark.Partitioner\u5bf9\u8c61\u7684\u503c\u4e2d\uff0c\u60a8\u5c06\u8bbe\u7f6e\u4e00\u4e2a\u6307\u793aRDD\u4e2d\u6bcf\u4e2a\u952e\u7684\u76ee\u6807\u5206\u533a\u7684\u5185\u5bb9\u3002<\/p>\n
\u5f53\u5728\u5206\u533a\u5316\u7684RDD\u4e0a\u6267\u884c\u50cfreduceByKey()\u8fd9\u6837\u7684\u64cd\u4f5c\u65f6\uff0c\u6bcf\u4e2a\u952e\u7684\u6240\u6709\u503c\u90fd\u5728\u5355\u4e2a\u673a\u5668\u4e0a\u672c\u5730\u8ba1\u7b97\uff0c\u5e76\u4e14\u53ea\u6709\u6700\u7ec8\u7684reduce()\u503c\u4f1a\u4ece\u6bcf\u4e2a\u5de5\u4f5c\u8282\u70b9\u8fd4\u56de\u4e3b\u8282\u70b9\uff08\u5982\u524d\u9762\u8bb2\u8fc7\u7684\uff09\u3002<\/p>\n
\u66f4\u8be6\u7ec6\u5730\u8bf4\uff0c\u5728shuffle\u8fc7\u7a0b\u4e2d\uff0c\u5c06\u5177\u6709\u76f8\u540c\u952e\u7684\u5143\u7d20\u5206\u914d\u5230\u540c\u4e00\u4e2apartition\u662fpartitioner\u7684\u5de5\u4f5c\u3002partitioner\u6839\u636e\u8f6c\u6362\u540e\u7684RDD\u7684partition\u6570\u548c\u5206\u914d\u5bf9\u8c61\u952e\u7684\u5185\u5bb9\u6765\u786e\u5b9a\u5206\u914d\u5143\u7d20\u7684\u76ee\u6807partition\u3002\u5728Spark\u4e2d\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u4f7f\u7528\u952e\u7684\u54c8\u5e0c\u503c\u9664\u4ee5\u8f6c\u6362\u540e\u7684RDD\u7684partition\u6570\u6240\u5f97\u7684\u4f59\u6570\u6765\u786e\u5b9a\u5206\u914d\u7684\u76ee\u6807partition\u3002<\/p>\n
\u53e6\u5916\uff0c\u5982\u679c\u8981\u5bf9\u4e24\u4e2aRDD\u8fdb\u884c\u64cd\u4f5c\uff0c\u5e76\u4e14\u4e8b\u5148\u8fdb\u884c\u4e86\u5206\u533a\u5904\u7406\uff0c\u90a3\u4e48\u81f3\u5c11\u4e24\u4e2aRDD\u4e2d\u7684\u4e00\u4e2a\u5c06\u4e0d\u4f1a\u8fdb\u884c\u6d17\u724c\u3002
\n\u6b64\u5916\uff0cSpark\u4f1a\u4e86\u89e3\u6bcf\u4e2a\u64cd\u4f5c\u5bf9\u5206\u533a\u7684\u5185\u90e8\u5f71\u54cd\uff0c\u56e0\u6b64\u4f1a\u81ea\u52a8\u4e3a\u7531\u6570\u636e\u5206\u533a\u64cd\u4f5c\u751f\u6210\u7684RDD\u8bbe\u7f6e\u5206\u533a\u5668\u3002<\/p>\n
\u6301\u7eed\u5b58\u5728\u4f18\u5316<\/h2>\n
\u4f46\u662f\uff0c\u5728\u5bf9RDD\u8fdb\u884c\u5206\u533a\u5e76\u5c06\u751f\u6210\u7684RDD\u7528\u4f5c\u8f6c\u6362\u76ee\u6807\u65f6\uff0c\u5e94\u8be5\u4f7f\u7528persist()\u8fdb\u884c\u6301\u4e45\u5316\u3002\u539f\u56e0\u662f\uff0c\u63a5\u4e0b\u6765\u5bf9RDD\u7684\u64cd\u4f5c\u5c06\u91cd\u65b0\u8bc4\u4f30\u7531\u5206\u533a\u751f\u6210\u7684\u6574\u4e2aRDD\u7cfb\u5217\uff0c\u56e0\u6b64\u5bf9\u5206\u533a\u4e4b\u524d\u7684RDD\u8fdb\u884c\u591a\u6b21\u54c8\u5e0c\u5206\u533a\u662f\u6ca1\u6709\u610f\u4e49\u7684\u3002<\/p>\n
\u8bf7\u53c2\u8003<\/h1>\n
    \n
  • \n
      http:\/\/www.ne.jp\/asahi\/hishidama\/home\/tech\/scala\/spark\/partition.html<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        \n
      • \n
          https:\/\/jaceklaskowski.gitbooks.io\/mastering-apache-spark\/content\/<\/ul>\n<\/li>\n<\/ul>\n
           <\/p>\n
            http:\/\/qiita.com\/Hiroki11x\/items\/4f5129094da4c91955bc<\/ul>\n","protected":false},"excerpt":{"rendered":"
            \u9996\u5148 \u9019\u7bc7\u6587\u7ae0\u8a66\u5716\u901a\u904e\u8209\u4f8b\u4f86\u7e3d\u7d50Apache Spark\u7684\u5206\u5340\u6982\u5ff5\u3002 \u6709\u95dcApache Spark\u7684\u6982\u8ff0\uff0c\u8acb\u53c3 […]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-36437","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nApache Spark - \u5173\u4e8e\u5206\u533a\u7684\u5185\u5bb9 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/apache-spark-\u5173\u4e8e\u5206\u533a\u7684\u5185\u5bb9\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Apache Spark - 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