spark-java+scala 乐字节教育框架+算子

约定不等于承诺〃 2022-11-18 10:51 157阅读 0赞

java  
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![在这里插入图片描述][20210419194612697.png]

# spark简介 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 1]  
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![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 5]

**DAG:先看到行动算子，再画流程图(有向无环图)，再计算**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 6]  
Spark 与 MapReduce 的区别  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 7]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 8]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 9]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 10]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 11]  
RDD不存数据，存储的是计算逻辑  
![在这里插入图片描述][20210413210124386.png]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 12]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 13]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 14]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 15]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 16]

# 4. Transformations 转换算子 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 17]

![filter][]  
![在这里插入图片描述][2021041322235888.png]  
![在这里插入图片描述][2021041322241085.png]  
![在这里插入图片描述][20210413222429336.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 18]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 19]  
![在这里插入图片描述][20210413221635446.png]

java 排序  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 20]  
![在这里插入图片描述][20210418131037702.png]  
**join**  
join只join相同key下的vale，所有join的分区都是跟着父rdd的最大分数走，及两个rdd jion，join后的rdd分区为两个父rdd分区数大的分区数

JavaPairRDD<Integer, String> nameRDD = sc.parallelizePairs(Arrays.asList(
    					new Tuple2<Integer, String>(0, "aa"),
    					new Tuple2<Integer, String>(1, "a"),
    					new Tuple2<Integer, String>(2, "b"),
    					new Tuple2<Integer, String>(3, "c")
    				));
    
    		JavaPairRDD<Integer, Integer> scoreRDD = sc.parallelizePairs(Arrays.asList(
    				new Tuple2<Integer, Integer>(1, 100),
    				new Tuple2<Integer, Integer>(2, 200),
    				new Tuple2<Integer, Integer>(3, 300),
    				new Tuple2<Integer, Integer>(4, 400)
    		));
    
    
    
    		JavaPairRDD<Integer, Tuple2<String, Integer>> join = nameRDD.join(scoreRDD);

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 21]  
rightOuterJoin  
![在这里插入图片描述][20210419195134214.png]  
![在这里插入图片描述][20210419195645666.png]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 22]  
**mapParition**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 23]  
**distance 去重**  
![在这里插入图片描述][20210419202705860.png]

java 代码自己实现distinct  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 24]  
![在这里插入图片描述][20210419202605898.png]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 25]  
mapPartitionWithIndex  
自已知道数据来自哪个分区  
![20210420200443853.png][]

* coalesce减少分区
     * 第二个参数是减少分区的过程中是否产生shuffle，true是产生shuffle，false是不产生shuffle，默认是false.
     * 如果coalesce的分区数比原来的分区数还多，第二个参数设置false，即不产生shuffle,不会起作用。
     * 如果第二个参数设置成true则效果和repartition一样，即coalesce(numPartitions,true) = repartition(numPartitions)

过滤操作之后减少分区

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 26]  
![在这里插入图片描述][20210420200044750.png]

# 5. Action 行动算子 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 27]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 28]  
![在这里插入图片描述][20210414195115679.png]  
![在这里插入图片描述][20210418131121131.png]  
**foreachPartition和 mapParition一样都是以分区为单位进行计算**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 29]  
结果  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 30]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 31]  
结果  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 32]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 33]  
reduce 可以做用在不是看k v格式的RDD

# 6. 控制算子 #

![在这里插入图片描述][20210414195310997.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 34]

## cache ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 35]

测试代码：

import org.apache.spark.SparkConf;
    import org.apache.spark.api.java.JavaRDD;
    import org.apache.spark.api.java.JavaSparkContext;
    
    public class CacheTest { 
    
        public static void main(String[] args) { 
            SparkConf conf = new SparkConf();
            conf.setMaster("local").setAppName("CacheTest");
            JavaSparkContext jsc = new JavaSparkContext(conf);
            JavaRDD<String> lines = jsc.textFile("./data/NASA_access_log_Aug95");
    
            lines = lines.cache();
            long startTime = System.currentTimeMillis();
            long count = lines.count();
            long endTime = System.currentTimeMillis();
            System.out.println("共"+count+ "条数据，"+"初始化时间+cache时间+计算时间="+
                    (endTime-startTime));
    
    
            long countStartTime = System.currentTimeMillis();
            long countrResult = lines.count();
            long countEndTime = System.currentTimeMillis();
            System.out.println("共"+countrResult+ "条数据，"+"计算时间="+ (countEndTime-
                    countStartTime));
    
            jsc.stop();
        }
    }

## persist： ##

![在这里插入图片描述][20210414195459115.png]  
**cache 和 persist 的注意事项：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 36]

## checkpoint ##

**cache和persist是为了提高性能的，checkpoint是为了容错的。**  
![在这里插入图片描述][20210414201904112.png]

![在这里插入图片描述][20210414195633191.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 37]

SparkConf conf = new SparkConf();
    conf.setMaster("local").setAppName("checkpoint");
    JavaSparkContext sc = new JavaSparkContext(conf);
    sc.setCheckpointDir("./checkpoint");
    JavaRDD<Integer> parallelize = sc.parallelize(Arrays.asList(1,2,3));
    parallelize.checkpoint();
    parallelize.count();
    sc.stop();

# 3.集群搭建 #

**一个人行动算子对应一个job，一个Job中有多个task一个task对应一个partition，partiiton数就是所谓并行度，partiiton分区在不同计算节点计算，不同的数据但是相同的逻辑及相同的task。**

# 3.0.Spark-Submit 提交参数 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 38]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 39]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 40]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 41]

## 3.1Standalone 模式两种提交任务方式 ##

Standalone 模式两种提交任务方式

### 1.Standalone-client 模式提交任务方式 ###

提交命令  
不指定默认是client模式

/spark-submit
    --master spark://node1:7077
    --class org.apache.spark.examples.SparkPi
    ../examples/jars/spark-examples_2.11-2.2.1.jar
    1000

或者

./spark-submit
    --master spark://node1:7077
    --deploy-mode client
    --class org.apache.spark.examples.SparkPi
    ../examples/jars/spark-examples_2.11-2.2.1.jar
    100

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 42]

![20210418102202885.png][]

执行原理图解  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 43]  
**提交一个任务就会在client节点启动一个对应Driver**  
![在这里插入图片描述][20210417155526564.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 44]

### 2. Standalone-cluster模式 提交任务方式 ###

提交命令

./spark-submit
    --master spark://node1:7077
    --deploy-mode cluster
    --class org.apache.spark.examples.SparkPi
    ../examples/jars/spark-examples_2.11-2.2.1.jar
    100

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 45]  
执行原理图解  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 46]  
提交一个任务就会在集群中的随机一个节点启动一个对应Driver  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 47]  
![在这里插入图片描述][20210417160357531.png]

## 3.2. Yarn 模式两种提交任务方式 ##

### 1.yarn-client 提交任务方式 ###

提交命令

./spark-submit
    --master yarn
    --class org.apache.spark.examples.SparkPi
    ../examples/jars/spark-examples_2.11-2.2.1.jar
    100

或者

./spark-submit
    --master yarn–client
    --class org.apache.spark.examples.SparkPi
    ../examples/jars/spark-examples_2.11-2.2.1.jar
    100

或者

./spark-submit
    --master yarn
    --deploy-mode client
    --class org.apache.spark.examples.SparkPi
    ../examples/jars/spark-examples_2.11-2.2.1.jar
    100

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 48]

执行原理图解  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 49]  
**提交一个任务就会在client节点启动一个对应的ApplicationMaster和Driver**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 50]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 51]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 52]

### 2. yarn-cluster 提交任务方式 ###

提交命令

./spark-submit
    --master yarn
    --deploy-mode cluster
    --class org.apache.spark.examples.SparkPi
    ../examples/jars/spark-examples_2.11-2.2.1.jar
    100

或者

./spark-submit
    --master yarn-cluster
    --class org.apache.spark.examples.SparkPi
    ../examples/jars/spark-examples_2.11-2.2.1.jar
    100

执行原理图解  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 53]  
**提交一个任务就会在随机的一台NodeManager节点启动一个对用的ApplicationMaster相当于Driver**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 54]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 55]

配置历史数据  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 56]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 57]

# 5. 窄依赖和宽依赖 #

一个application下可以有多个job(一个行动算子对应一个job)，一个job可能分为多个stage，一个stage可能包含多个task。  
job1,job2，job之间运行时串行的，及job1执行完才能执行job2  
stage之间可能串行也可能并行  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 58]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 59]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 60]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 61]  
宽窄依赖图理解  
**RDD分区数不改变就是窄依赖，分区改变就是宽依赖**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 62]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 63]

# 6. Stage #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 64]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 59]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 65]  
**宽依赖的算子可以指定并行度(partiiton数)**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 66]

val conf = new SparkConf()
    conf.setMaster("local").setAppName("pipeline");
    val sc = new SparkContext(conf)
    val rdd = sc.parallelize(Array(1,2,3,4))
    val rdd1 = rdd.map {  x => { 
    println("map--------"+x) x
    }}
    val rdd2 = rdd1.filter {  x => { 
    println("fliter********"+x)
    true
    } }
    rdd2.collect()
    sc.stop()

![在这里插入图片描述][20210419212043507.png]

# 7. Spark 资源调度和任务调度 #

**一个stage一个stak执行不结束这个stage就执行不结束，satage对应的job(任务)就执行不结束，及颗老鼠屎坏了一锅粥。**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 67]  
**Spark 资源调度和任务调度的流程：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 68]  
**执行慢的task，启动一个新的task计算不交默认是关闭的。**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 69]  
**图解 Spark 资源调度和任务调度的流程**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 70]  
**粗粒度资源申请和细粒度资源申请**

**MR是细粒度的，由每个task计算时task自己申请资源，task计算完就释放资源  
Spark是粗粒度的，任务开始的给所有的task申请好资源，所有的task都计算完才释放资源。**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 71]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 72]

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[filter]: /images/20221022/459a653767564515a0d07feb22efe4f3.png
[2021041322235888.png]: /images/20221022/036864501e5e45f7bba50ec5c4d13435.png
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