将json数组加载到pig中

qnzebej0 于 2021-06-02 发布在 Hadoop

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我有一个json文件，格式如下

[
  {
    "id": 2,
    "createdBy": 0,
    "status": 0,
    "utcTime": "Oct 14, 2014 4:49:47 PM",
    "placeName": "21/F, Cunningham Main Rd, Sampangi Rama NagarBengaluruKarnatakaIndia",
    "longitude": 77.5983817,
    "latitude": 12.9832418,
    "createdDate": "Sep 16, 2014 2:59:03 PM",
    "accuracy": 5,
    "loginType": 1,
    "mobileNo": "0000005567"
  },
  {
    "id": 4,
    "createdBy": 0,
    "status": 0,
    "utcTime": "Oct 14, 2014 4:52:48 PM",
    "placeName": "21/F, Cunningham Main Rd, Sampangi Rama NagarBengaluruKarnatakaIndia",
    "longitude": 77.5983817,
    "latitude": 12.9832418,
    "createdDate": "Oct 8, 2014 5:24:42 PM",
    "accuracy": 5,
    "loginType": 1,
    "mobileNo": "0000005566"
  }
]

当我尝试使用jsonloader类将数据加载到pig时，我得到了一个错误，比如输入的意外结束：object的expected close marker

a = LOAD '/user/root/jsoneg/exp.json' USING JsonLoader('id:int,createdBy:int,status:int,utcTime:chararray,placeName:chararray,longitude:double,latitude:double,createdDate:chararray,accuracy:double,loginType:double,mobileNo:chararray');
b = foreach a generate $0,$1,$2;
dump b;

hadoop hdfs JSON bigdata apache-pig

来源：https://stackoverflow.com/questions/26710438/load-json-array-into-pig

1条答案

按热度按时间

7kqas0il1#

以前我也遇到过类似的问题，后来我知道pigjson不支持多行json格式。它总是希望json输入必须是单行的。
我建议您使用elephantbird json加载程序，而不是本机jsonloader。它非常适合jsons格式。
您可以从下面的链接下载jar

http://www.java2s.com/Code/Jar/e/elephant.htm

我将您的输入格式改为单行，并通过elephantbird加载，如下所示

input.json
{"test":[{"id": 2,"createdBy": 0,"status": 0,"utcTime": "Oct 14, 2014 4:49:47 PM","placeName": "21/F, Cunningham Main Rd, Sampangi Rama NagarBengaluruKarnatakaIndia","longitude": 77.5983817,"latitude": 12.9832418,"createdDate": "Sep 16, 2014 2:59:03 PM","accuracy": 5,"loginType": 1,"mobileNo": "0000005567"},{"id": 4,"createdBy": 0,"status": 0,"utcTime": "Oct 14, 2014 4:52:48 PM","placeName": "21/F, Cunningham Main Rd, Sampangi Rama NagarBengaluruKarnatakaIndia","longitude": 77.5983817,"latitude": 12.9832418,"createdDate": "Oct 8, 2014 5:24:42 PM","accuracy": 5,"loginType": 1,"mobileNo": "0000005566"}]}

PigScript:
REGISTER '/tmp/elephant-bird-hadoop-compat-4.1.jar';
REGISTER '/tmp/elephant-bird-pig-4.1.jar';

A = LOAD 'input.json ' USING com.twitter.elephantbird.pig.load.JsonLoader('-nestedLoad');
B = FOREACH A GENERATE FLATTEN($0#'test');
C = FOREACH B GENERATE FLATTEN($0) AS mymap;
D = FOREACH C GENERATE mymap#'id',mymap#'placeName',mymap#'status';
DUMP D;

Output:
(2,21/F, Cunningham Main Rd, Sampangi Rama NagarBengaluruKarnatakaIndia,0)
(4,21/F, Cunningham Main Rd, Sampangi Rama NagarBengaluruKarnatakaIndia,0)

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将json数组加载到pig中

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