[Spark][Python]对HDFS 上的文件，采用绝对路径，来读取获得 RDD-低调大师

[Spark][Python]对HDFS 上的文件，采用绝对路径，来读取获得 RDD

2017-12-18 546

对HDFS 上的文件，采用绝对路径，来读取获得 RDD:

In [102]: mydata=sc.textFile("file:/home/training/test.txt")
17/09/24 06:31:04 INFO storage.MemoryStore: Block broadcast_30 stored as values in memory (estimated size 230.5 KB, free 2.4 MB)
17/09/24 06:31:04 INFO storage.MemoryStore: Block broadcast_30_piece0 stored as bytes in memory (estimated size 21.5 KB, free 2.5 MB)
17/09/24 06:31:04 INFO storage.BlockManagerInfo: Added broadcast_30_piece0 in memory on localhost:33950 (size: 21.5 KB, free: 208.6 MB)
17/09/24 06:31:04 INFO spark.SparkContext: Created broadcast 30 from textFile at NativeMethodAccessorImpl.java:-2

In [103]: mydata.take(1)
17/09/24 06:31:09 INFO mapred.FileInputFormat: Total input paths to process : 1
17/09/24 06:31:09 INFO spark.SparkContext: Starting job: runJob at PythonRDD.scala:393
17/09/24 06:31:09 INFO scheduler.DAGScheduler: Got job 17 (runJob at PythonRDD.scala:393) with 1 output partitions
17/09/24 06:31:09 INFO scheduler.DAGScheduler: Final stage: ResultStage 17 (runJob at PythonRDD.scala:393)
17/09/24 06:31:09 INFO scheduler.DAGScheduler: Parents of final stage: List()
17/09/24 06:31:09 INFO scheduler.DAGScheduler: Missing parents: List()
17/09/24 06:31:09 INFO scheduler.DAGScheduler: Submitting ResultStage 17 (PythonRDD[50] at RDD at PythonRDD.scala:43), which has no missing parents
17/09/24 06:31:09 INFO storage.MemoryStore: Block broadcast_31 stored as values in memory (estimated size 4.8 KB, free 2.5 MB)
17/09/24 06:31:09 INFO storage.MemoryStore: Block broadcast_31_piece0 stored as bytes in memory (estimated size 3.0 KB, free 2.5 MB)
17/09/24 06:31:09 INFO storage.BlockManagerInfo: Added broadcast_31_piece0 in memory on localhost:33950 (size: 3.0 KB, free: 208.6 MB)
17/09/24 06:31:09 INFO spark.SparkContext: Created broadcast 31 from broadcast at DAGScheduler.scala:1006
17/09/24 06:31:09 INFO scheduler.DAGScheduler: Submitting 1 missing tasks from ResultStage 17 (PythonRDD[50] at RDD at PythonRDD.scala:43)
17/09/24 06:31:09 INFO scheduler.TaskSchedulerImpl: Adding task set 17.0 with 1 tasks
17/09/24 06:31:09 INFO scheduler.TaskSetManager: Starting task 0.0 in stage 17.0 (TID 17, localhost, partition 0,PROCESS_LOCAL, 2130 bytes)
17/09/24 06:31:09 INFO executor.Executor: Running task 0.0 in stage 17.0 (TID 17)
17/09/24 06:31:09 INFO rdd.HadoopRDD: Input split: file:/home/training/test.txt:0+34
17/09/24 06:31:10 INFO python.PythonRunner: Times: total = 28, boot = 11, init = 16, finish = 1
17/09/24 06:31:10 INFO executor.Executor: Finished task 0.0 in stage 17.0 (TID 17). 2158 bytes result sent to driver
17/09/24 06:31:10 INFO scheduler.DAGScheduler: ResultStage 17 (runJob at PythonRDD.scala:393) finished in 0.344 s
17/09/24 06:31:10 INFO scheduler.DAGScheduler: Job 17 finished: runJob at PythonRDD.scala:393, took 0.750241 s
17/09/24 06:31:10 INFO scheduler.TaskSetManager: Finished task 0.0 in stage 17.0 (TID 17) in 348 ms on localhost (1/1)
17/09/24 06:31:10 INFO scheduler.TaskSchedulerImpl: Removed TaskSet 17.0, whose tasks have all completed, from pool
Out[103]: [u'This is a test 1']

In [104]:

本文转自健哥的数据花园博客园博客，原文链接：http://www.cnblogs.com/gaojian/p/7588750.html，如需转载请自行联系原作者

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原文链接：https://yq.aliyun.com/articles/355511

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[python][spark]wholeTextFiles 读入多个文件的例子

$pwd /home/training/mydir $cat file1.json { "firstName":"Fred", "lastName":"Flintstone", "userid":"123" } $cat file2.json { "firstName":"Barney", "lastName":"Rubble", "userid":"123" } [training@localhost ~]$ hdfs dfs -put /home/training/mydir [training@localhost ~]$ [training@localhost ~]$ hdfs dfs -ls Found 4 items drwxrwxrwx - training supergroup 0 2017-09-23 19:26 .sparkStaging -rw-rw-rw- 1 training supergroup 48 2017-09-25 05:31 cats.txt drwxrwxrwx - training supergroup 0 2017-09-25 15:39 my...

2017-12-19

537

map 就是对一个RDD的各个元素都施加处理，得到一个新的RDD 的过程 [training@localhost ~]$ cat names.txt Year,First Name,County,Sex,Count 2012,DOMINIC,CAYUGA,M,6 2012,ADDISON,ONONDAGA,F,14 2012,ADDISON,ONONDAGA,F,14 2012,JULIA,ONONDAGA,F,15 [training@localhost ~]$ hdfs dfs -put names.txt [training@localhost ~]$ hdfs dfs -cat names.txt Year,First Name,County,Sex,Count 2012,DOMINIC,CAYUGA,M,6 2012,ADDISON,ONONDAGA,F,14 2012,ADDISON,ONONDAGA,F,14 2012,JULIA,ONONDAGA,F,15 [training@localhost ~]$ In [98]: t_names = sc.textFile("n...

2017-12-19

669

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