如何使用kite数据集分区模式正确导入csv数据集?

eqoofvh9  于 2021-06-02  发布在  Hadoop
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我正在使用movielens的公共可用csv数据集我为ratings.csv创建了一个分区数据集:

kite-dataset create ratings --schema rating.avsc --partition-by year-month.json --format parquet

以下是my year-month.json:

[ {
  "name" : "year",
  "source" : "timestamp",
  "type" : "year"
}, {
  "name" : "month",
  "source" : "timestamp",
  "type" : "month"
} ]

这是我的csv导入命令:

mkite-dataset csv-import ratings.csv ratings

导入完成后,我运行此命令查看实际创建的年份和月份分区:

hadoop fs -ls /user/hive/warehouse/ratings/

我注意到,只创建了一个年分区,在其中创建了一个月分区:

[cloudera@quickstart ml-20m]$ hadoop fs -ls /user/hive/warehouse/ratings/
Found 3 items
drwxr-xr-x   - cloudera supergroup          0 2016-06-12 18:49 /user/hive/warehouse/ratings/.metadata
drwxr-xr-x   - cloudera supergroup          0 2016-06-12 18:59 /user/hive/warehouse/ratings/.signals
drwxrwxrwx   - cloudera supergroup          0 2016-06-12 18:59 /user/hive/warehouse/ratings/year=1970

[cloudera@quickstart ml-20m]$ hadoop fs -ls /user/hive/warehouse/ratings/year=1970/
Found 1 items
drwxrwxrwx   - cloudera supergroup          0 2016-06-12 18:59 /user/hive/warehouse/ratings/year=1970/month=01

执行这种分区导入的正确方法是什么?这样会创建所有年份和所有月份的分区?

9wbgstp7

9wbgstp71#

最后加三个零作为时间戳。
使用下面的shell脚本来完成


# !/bin/bash

# add the CSV header to both files

head -n 1 ratings.csv > ratings_1.csv
head -n 1 ratings.csv > ratings_2.csv

# output the first 10,000,000 rows to ratings_1.csv

# this includes the header, and uses tail to remove it

head -n 10000001 ratings.csv | tail -n +2 | awk '{print "000" $1 }' >> ratings_1.csv

    enter code here

# output the rest of the file to ratings_2.csv

# this starts at the line after the ratings_1 file stopped

tail -n +10000002 ratings.csv | awk '{print "000" $1 }' >> ratings_2.csv

就连我也有这个问题,加了3个零就解决了。

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