我该如何在命令行中检查Parquet文件的内容?
目前我所看到的唯一选项是:
$ hadoop fs -get my-path local-file
$ parquet-tools head local-file | less
我希望避免创建local-file
并且以JSON
格式查看文件内容,而不是parquet-tools
打印的无类型文本。有简单的方法吗?
我该如何在命令行中检查Parquet文件的内容?
目前我所看到的唯一选项是:
$ hadoop fs -get my-path local-file
$ parquet-tools head local-file | less
我希望避免创建local-file
并且以JSON
格式查看文件内容,而不是parquet-tools
打印的无类型文本。有简单的方法吗?
您可以使用parquet-tools
命令中的cat
和--json
选项,以便在没有本地副本且以JSON格式查看文件。
以下是一个示例:
parquet-tools cat --json hdfs://localhost/tmp/save/part-r-00000-6a3ccfae-5eb9-4a88-8ce8-b11b2644d5de.gz.parquet
这将以 JSON 格式输出数据:
{"name":"gil","age":48,"city":"london"}
{"name":"jane","age":30,"city":"new york"}
{"name":"jordan","age":18,"city":"toronto"}
免责声明:此测试在Cloudera CDH 5.12.0中进行。
在您的Mac上安装Homebrew(请参见https://brew.sh/),然后执行以下操作:
brew install parquet-tools
完成后,您可以在终端中使用parquet-tools二进制文件(它现在应该在您的路径中)进行各种命令。
parquet-tools
或 parquet-tools -h
将提供使用信息。
示例:
> parquet-tools rowcount part-00000-fc34f237-c985-4ebc-822b-87fa446f6f70.c000.snappy.parquet
Total RowCount: 148192
> parquet-tools head -n 1 part-00000-fc34f237-c985-4ebc-822b-87fa446f6f70.c000.snappy.parquet
:created_at = 2019-02-28T00:16:06.329Z
:id = row-wive~i58u-qaeu
:updated_at = 2019-02-28T00:16:06.329Z
agency = 1
body_style = PA
color = GY
fine_amount = 63
issue_date = 17932
issue_time = 1950
latitude = 64379050
location = 12743 DAVENTRY
longitude = 19261609
make = HYDA
marked_time =
meter_id =
plate_expiry_date = 18048
route = 16X2
rp_state_plate = CA
ticket_number = 1020798376
vin =
violation_code = 22502A#
violation_description = 18 IN. CURB/2 WAY
> parquet-tools meta part-00000-fc34f237-c985-4ebc-822b-87fa446f6f70.c000.snappy.parquet
file: file:/Users/matthewropp/team_demo/los-angeles-parking-citations/raw_citations/issue_month=201902/part-00000-fc34f237-c985-4ebc-822b-87fa446f6f70.c000.snappy.parquet
creator: parquet-mr version 1.10.0 (build 031a6654009e3b82020012a18434c582bd74c73a)
extra: org.apache.spark.sql.parquet.row.metadata = {"type":"struct","fields":[{"name":":created_at","type":"string","nullable":true,"metadata":{}},{"name":":id","type":"string","nullable":true,"metadata":{}},{"name":":updated_at","type":"string","nullable":true,"metadata":{}},{"name":"agency","type":"integer","nullable":true,"metadata":{}},{"name":"body_style","type":"string","nullable":true,"metadata":{}},{"name":"color","type":"string","nullable":true,"metadata":{}},{"name":"fine_amount","type":"integer","nullable":true,"metadata":{}},{"name":"issue_date","type":"date","nullable":true,"metadata":{}},{"name":"issue_time","type":"integer","nullable":true,"metadata":{}},{"name":"latitude","type":"decimal(8,1)","nullable":true,"metadata":{}},{"name":"location","type":"string","nullable":true,"metadata":{}},{"name":"longitude","type":"decimal(8,1)","nullable":true,"metadata":{}},{"name":"make","type":"string","nullable":true,"metadata":{}},{"name":"marked_time","type":"string","nullable":true,"metadata":{}},{"name":"meter_id","type":"string","nullable":true,"metadata":{}},{"name":"plate_expiry_date","type":"date","nullable":true,"metadata":{}},{"name":"route","type":"string","nullable":true,"metadata":{}},{"name":"rp_state_plate","type":"string","nullable":true,"metadata":{}},{"name":"ticket_number","type":"string","nullable":false,"metadata":{}},{"name":"vin","type":"string","nullable":true,"metadata":{}},{"name":"violation_code","type":"string","nullable":true,"metadata":{}},{"name":"violation_description","type":"string","nullable":true,"metadata":{}}]}
file schema: spark_schema
--------------------------------------------------------------------------------
: created_at: OPTIONAL BINARY O:UTF8 R:0 D:1
: id: OPTIONAL BINARY O:UTF8 R:0 D:1
: updated_at: OPTIONAL BINARY O:UTF8 R:0 D:1
agency: OPTIONAL INT32 R:0 D:1
body_style: OPTIONAL BINARY O:UTF8 R:0 D:1
color: OPTIONAL BINARY O:UTF8 R:0 D:1
fine_amount: OPTIONAL INT32 R:0 D:1
issue_date: OPTIONAL INT32 O:DATE R:0 D:1
issue_time: OPTIONAL INT32 R:0 D:1
latitude: OPTIONAL INT32 O:DECIMAL R:0 D:1
location: OPTIONAL BINARY O:UTF8 R:0 D:1
longitude: OPTIONAL INT32 O:DECIMAL R:0 D:1
make: OPTIONAL BINARY O:UTF8 R:0 D:1
marked_time: OPTIONAL BINARY O:UTF8 R:0 D:1
meter_id: OPTIONAL BINARY O:UTF8 R:0 D:1
plate_expiry_date: OPTIONAL INT32 O:DATE R:0 D:1
route: OPTIONAL BINARY O:UTF8 R:0 D:1
rp_state_plate: OPTIONAL BINARY O:UTF8 R:0 D:1
ticket_number: REQUIRED BINARY O:UTF8 R:0 D:0
vin: OPTIONAL BINARY O:UTF8 R:0 D:1
violation_code: OPTIONAL BINARY O:UTF8 R:0 D:1
violation_description: OPTIONAL BINARY O:UTF8 R:0 D:1
row group 1: RC:148192 TS:10503944 OFFSET:4
--------------------------------------------------------------------------------
: created_at: BINARY SNAPPY DO:0 FPO:4 SZ:607/616/1.01 VC:148192 ENC:BIT_PACKED,PLAIN_DICTIONARY,RLE ST:[min: 2019-02-28T00:16:06.329Z, max: 2019-03-02T00:20:00.249Z, num_nulls: 0]
: id: BINARY SNAPPY DO:0 FPO:611 SZ:2365472/3260525/1.38 VC:148192 ENC:BIT_PACKED,PLAIN,RLE ST:[min: row-2229_y75z.ftdu, max: row-zzzs_4hta.8fub, num_nulls: 0]
: updated_at: BINARY SNAPPY DO:0 FPO:2366083 SZ:602/611/1.01 VC:148192 ENC:BIT_PACKED,PLAIN_DICTIONARY,RLE ST:[min: 2019-02-28T00:16:06.329Z, max: 2019-03-02T00:20:00.249Z, num_nulls: 0]
agency: INT32 SNAPPY DO:0 FPO:2366685 SZ:4871/5267/1.08 VC:148192 ENC:BIT_PACKED,PLAIN_DICTIONARY,RLE ST:[min: 1, max: 58, num_nulls: 0]
body_style: BINARY SNAPPY DO:0 FPO:2371556 SZ:36244/61827/1.71 VC:148192 ENC:BIT_PACKED,PLAIN_DICTIONARY,RLE ST:[min: , max: WR, num_nulls: 0]
color: BINARY SNAPPY DO:0 FPO:2407800 SZ:111267/111708/1.00 VC:148192 ENC:BIT_PACKED,PLAIN_DICTIONARY,RLE ST:[min: , max: YL, num_nulls: 0]
fine_amount: INT32 SNAPPY DO:0 FPO:2519067 SZ:71989/82138/1.14 VC:148192 ENC:BIT_PACKED,PLAIN_DICTIONARY,RLE ST:[min: 25, max: 363, num_nulls: 63]
issue_date: INT32 SNAPPY DO:0 FPO:2591056 SZ:20872/23185/1.11 VC:148192 ENC:BIT_PACKED,PLAIN_DICTIONARY,RLE ST:[min: 2019-02-01, max: 2019-02-27, num_nulls: 0]
issue_time: INT32 SNAPPY DO:0 FPO:2611928 SZ:210026/210013/1.00 VC:148192 ENC:BIT_PACKED,PLAIN_DICTIONARY,RLE ST:[min: 1, max: 2359, num_nulls: 41]
latitude: INT32 SNAPPY DO:0 FPO:2821954 SZ:508049/512228/1.01 VC:148192 ENC:BIT_PACKED,PLAIN_DICTIONARY,RLE ST:[min: 99999.0, max: 6513161.2, num_nulls: 0]
location: BINARY SNAPPY DO:0 FPO:3330003 SZ:1251364/2693435/2.15 VC:148192 ENC:BIT_PACKED,PLAIN_DICTIONARY,PLAIN,RLE ST:[min: , max: ZOMBAR/VALERIO, num_nulls: 0]
longitude: INT32 SNAPPY DO:0 FPO:4581367 SZ:516233/520692/1.01 VC:148192 ENC:BIT_PACKED,PLAIN_DICTIONARY,RLE ST:[min: 99999.0, max: 1941557.4, num_nulls: 0]
make: BINARY SNAPPY DO:0 FPO:5097600 SZ:147034/150364/1.02 VC:148192 ENC:BIT_PACKED,PLAIN_DICTIONARY,RLE ST:[min: , max: YAMA, num_nulls: 0]
marked_time: BINARY SNAPPY DO:0 FPO:5244634 SZ:11675/17658/1.51 VC:148192 ENC:BIT_PACKED,PLAIN_DICTIONARY,RLE ST:[min: , max: 959.0, num_nulls: 0]
meter_id: BINARY SNAPPY DO:0 FPO:5256309 SZ:172432/256692/1.49 VC:148192 ENC:BIT_PACKED,PLAIN_DICTIONARY,RLE ST:[min: , max: YO97, num_nulls: 0]
plate_expiry_date: INT32 SNAPPY DO:0 FPO:5428741 SZ:149849/152288/1.02 VC:148192 ENC:BIT_PACKED,PLAIN_DICTIONARY,RLE ST:[min: 2000-02-01, max: 2099-12-01, num_nulls: 18624]
route: BINARY SNAPPY DO:0 FPO:5578590 SZ:38377/45948/1.20 VC:148192 ENC:BIT_PACKED,PLAIN_DICTIONARY,RLE ST:[min: , max: WTD, num_nulls: 0]
rp_state_plate: BINARY SNAPPY DO:0 FPO:5616967 SZ:33281/60186/1.81 VC:148192 ENC:BIT_PACKED,PLAIN_DICTIONARY,RLE ST:[min: AB, max: XX, num_nulls: 0]
ticket_number: BINARY SNAPPY DO:0 FPO:5650248 SZ:801039/2074791/2.59 VC:148192 ENC:BIT_PACKED,PLAIN ST:[min: 1020798376, max: 4350802142, num_nulls: 0]
vin: BINARY SNAPPY DO:0 FPO:6451287 SZ:64/60/0.94 VC:148192 ENC:BIT_PACKED,PLAIN_DICTIONARY,RLE ST:[min: , max: , num_nulls: 0]
violation_code: BINARY SNAPPY DO:0 FPO:6451351 SZ:94784/131071/1.38 VC:148192 ENC:BIT_PACKED,PLAIN_DICTIONARY,RLE ST:[min: 000, max: 8942, num_nulls: 0]
violation_description: BINARY SNAPPY DO:0 FPO:6546135 SZ:95937/132641/1.38 VC:148192 ENC:BIT_PACKED,PLAIN_DICTIONARY,RLE ST:[min: , max: YELLOW ZONE, num_nulls: 0]
> parquet-tools dump -m -c make part-00000-fc34f237-c985-4ebc-822b-87fa446f6f70.c000.snappy.parquet | head -20
BINARY make
--------------------------------------------------------------------------------
*** row group 1 of 1, values 1 to 148192 ***
value 1: R:0 D:1 V:HYDA
value 2: R:0 D:1 V:NISS
value 3: R:0 D:1 V:NISS
value 4: R:0 D:1 V:TOYO
value 5: R:0 D:1 V:AUDI
value 6: R:0 D:1 V:MERC
value 7: R:0 D:1 V:LEX
value 8: R:0 D:1 V:BMW
value 9: R:0 D:1 V:GMC
value 10: R:0 D:1 V:HOND
value 11: R:0 D:1 V:TOYO
value 12: R:0 D:1 V:NISS
value 13: R:0 D:1 V:
value 14: R:0 D:1 V:THOR
value 15: R:0 D:1 V:DODG
value 16: R:0 D:1 V:DODG
value 17: R:0 D:1 V:HOND
pip install parquet-tools
时,该工具没有 meta
或 rowcount
命令,只有 show
、csv
和 inspect
。这是一个不同的工具还是它已经改变了? - Dahnpip
安装的版本是旧版。我建议你通过homebrew
进行安装。如果你不想使用homebrew
,也可以尝试使用pip install parquet-cli
来获取类似功能的软件。 - mropppip install parquet-cli
parq input.parquet --head 10
我建议只需构建和运行适用于您的Hadoop分发版的parquet-tools.jar。
查看Github项目:https://github.com/apache/parquet-mr/tree/master/parquet-tools
hadoop jar ./parquet-tools-<VERSION>.jar <command>
java.lang.NoClassDefFoundError: org/apache/hadoop/fs/Path
。 - Dobes Vandermeer默认情况下,parquet-tools 通常会查找本地文件目录,因此要将其指向hdfs,我们需要在文件路径的开头添加hdfs://。因此在您的情况下,可以这样做:
parquet-tools head hdfs://localhost/<hdfs-path> | less
我遇到了同样的问题,但对我来说它运行得很好。没有必要先在本地下载文件。
DuckDB有一个CLI工具(适用于Linux、Windows和macOS的预构建二进制文件),可以在命令行中使用它来查询Parquet数据。
PS C:\Users\nsuser\dev\standalone_executable_binaries> ./duckdb
v0.5.1 7c111322d
Enter ".help" for usage hints.
Connected to a transient in-memory database.
Use ".open FILENAME" to reopen on a persistent database.
使用 SQL 查询读取 parquet 数据
D SELECT * FROM READ_PARQUET('C:\Users\nsuser\dev\sample_files\userdata1.parquet') limit 3;
┌─────────────────────┬────┬────────────┬───────────┬─────────────────────────┬────────┬────────────────┬──────────────────┬───────────┬───────────┬───────────┬─────────────────────┬──────────┐
│ registration_dttm │ id │ first_name │ last_name │ email │ gender │ ip_address │ cc │ country │ birthdate │ salary │ title │ comments │
├─────────────────────┼────┼────────────┼───────────┼─────────────────────────┼────────┼────────────────┼──────────────────┼───────────┼───────────┼───────────┼─────────────────────┼──────────┤
│ 2016-02-03 07:55:29 │ 1 │ Amanda │ Jordan │ ajordan0@com.com │ Female │ 1.197.201.2 │ 6759521864920116 │ Indonesia │ 3/8/1971 │ 49756.53 │ Internal Auditor │ 1E+02 │
│ 2016-02-03 17:04:03 │ 2 │ Albert │ Freeman │ afreeman1@is.gd │ Male │ 218.111.175.34 │ │ Canada │ 1/16/1968 │ 150280.17 │ Accountant IV │ │
│ 2016-02-03 01:09:31 │ 3 │ Evelyn │ Morgan │ emorgan2@altervista.org │ Female │ 7.161.136.94 │ 6767119071901597 │ Russia │ 2/1/1960 │ 144972.51 │ Structural Engineer │ │
└─────────────────────┴────┴────────────┴───────────┴─────────────────────────┴────────┴────────────────┴──────────────────┴───────────┴───────────┴───────────┴─────────────────────┴──────────┘
D DESCRIBE SELECT * FROM READ_PARQUET('C:\Users\nsuser\dev\sample_files\userdata1.parquet');
OR
D SELECT * FROM PARQUET_SCHEMA('C:\Users\nsuser\dev\sample_files\userdata1.parquet');
┌───────────────────┬─────────────┬──────┬─────┬─────────┬───────┐
│ column_name │ column_type │ null │ key │ default │ extra │
├───────────────────┼─────────────┼──────┼─────┼─────────┼───────┤
│ registration_dttm │ TIMESTAMP │ YES │ │ │ │
│ id │ INTEGER │ YES │ │ │ │
│ first_name │ VARCHAR │ YES │ │ │ │
│ birthdate │ VARCHAR │ YES │ │ │ │
│ salary │ DOUBLE │ YES │ │ │ │
└───────────────────┴─────────────┴──────┴─────┴─────────┴───────┘
读取 Parquet 元数据和统计信息。
D SELECT row_group_id, row_group_num_rows, compression, stats_min, stats_max, stats_null_count FROM PARQUET_METADATA('C:\Users\nsuser\dev\sample_files\userdata1.parquet');
┌──────────────┬────────────────────┬──────────────┬─────────────────────┬─────────────────────┬──────────────────┐
│ row_group_id │ row_group_num_rows │ compression │ stats_min │ stats_max │ stats_null_count │
├──────────────┼────────────────────┼──────────────┼─────────────────────┼─────────────────────┼──────────────────┤
│ 0 │ 1000 │ UNCOMPRESSED │ 2016-02-03 22:59:12 │ 2016-02-03 20:51:31 │ 0 │
│ 0 │ 1000 │ UNCOMPRESSED │ 1 │ 1000 │ 0 │
│ 0 │ 1000 │ UNCOMPRESSED │ "Bonaire │ Zimbabwe │ 0 │
│ 0 │ 1000 │ UNCOMPRESSED │ │ 9/9/1981 │ 0 │
│ 0 │ 1000 │ UNCOMPRESSED │ 12380.49 │ 286592.99 │ 68 │
└──────────────┴────────────────────┴──────────────┴─────────────────────┴─────────────────────┴──────────────────┘
替代方案:
parquet-cli 是一个轻量级的Python替代方案。
pip install parquet-cli //installs via pip
parq filename.parquet //view meta data
parq filename.parquet --schema //view the schema
parq filename.parquet --head 10 //view top n rows
duckdb
。 - WestCoastProjects实际上,我发现pandas已经支持parquet文件格式,只要安装了pyarrow或fastparquet作为其后端。请查看read_parquet
:
import pandas as pd
df = pd.read_parquet('your-file.parquet')
df.head(10)
...
from pyarrow import parquet
import pandas
p = parquet.read_table('/path/to/your/xxxxx.parquet')
df = p.to_pandas()
df.head(10)
...
如果您正在使用HDFS,以下命令非常有用,因为它们经常被使用(留在这里供将来参考):
hadoop jar parquet-tools-1.9.0.jar schema hdfs://path/to/file.snappy.parquet
hadoop jar parquet-tools-1.9.0.jar head -n5 hdfs://path/to/file.snappy.parquet
docker run -ti -v C:\file.parquet:/tmp/file.parquet nathanhowell/parquet-tools cat /tmp/file.parquet
choco install parq
parq.exe
。parquet-reader
。这个实用程序似乎做了同样的工作。
cat --json
没有起作用,但最终我们使用了parquet-tools csv input.gz.parquet | csvq -f json "select id, description"
- GC268DMbrew install parquet-cli
,然后执行命令parquet
。https://github.com/apache/parquet-mr/tree/master/parquet-cli - Josh Hibschmanbrew install parquet-tools
进行安装。您可以选择使用“head”模式仅显示几行。parquet-tools head --json [file]
将打印前5条记录。 我无法让--records
标志工作,该标志应允许您指定要显示3条记录。 - Matt Farrow