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Posted to dev@parquet.apache.org by "Novice (Jira)" <ji...@apache.org> on 2020/05/05 17:03:00 UTC
[jira] [Commented] (PARQUET-1857) [C++][Parquet] ParquetFileReader
unable to read files with more than 32767 row groups
[ https://issues.apache.org/jira/browse/PARQUET-1857?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17100081#comment-17100081 ]
Novice commented on PARQUET-1857:
---------------------------------
Thanks Wes.
So I tried to reduce the number of row groups, to 41.
Here is the error I got:
```
>>> df = pd.read_parquet("test.parquet", engine="pyarrow")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/.local/lib/python3.7/site-packages/pandas/io/parquet.py", line 296, in read_parquet
return impl.read(path, columns=columns, **kwargs)
File "/home/.local/lib/python3.7/site-packages/pandas/io/parquet.py", line 125, in read
path, columns=columns, **kwargs
File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 1281, in read_table
use_pandas_metadata=use_pandas_metadata)
File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 1137, in read
use_pandas_metadata=use_pandas_metadata)
File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 605, in read
table = reader.read(**options)
File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 253, in read
use_threads=use_threads)
File "pyarrow/_parquet.pyx", line 1136, in pyarrow._parquet.ParquetReader.read_all
File "pyarrow/error.pxi", line 99, in pyarrow.lib.check_status
OSError: Unexpected end of stream
>>> df = pd.read_parquet("test.parquet", engine="fastparquet")
/home/miniconda3/envs/ds/lib/python3.7/site-packages/fastparquet/encoding.py:222: NumbaDeprecationWarning: The 'numba.jitclass' decorator has moved to 'numba.experimental.jitclass' to better reflect the experimental nature of the functionality. Please update your imports to accommodate this change and see http://numba.pydata.org/numba-doc/latest/reference/deprecation.html#change-of-jitclass-location for the time frame.
Numpy8 = numba.jitclass(spec8)(NumpyIO)
/home/miniconda3/envs/ds/lib/python3.7/site-packages/fastparquet/encoding.py:224: NumbaDeprecationWarning: The 'numba.jitclass' decorator has moved to 'numba.experimental.jitclass' to better reflect the experimental nature of the functionality. Please update your imports to accommodate this change and see http://numba.pydata.org/numba-doc/latest/reference/deprecation.html#change-of-jitclass-location for the time frame.
Numpy32 = numba.jitclass(spec32)(NumpyIO)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/.local/lib/python3.7/site-packages/pandas/io/parquet.py", line 296, in read_parquet
return impl.read(path, columns=columns, **kwargs)
File "/home/.local/lib/python3.7/site-packages/pandas/io/parquet.py", line 201, in read
return parquet_file.to_pandas(columns=columns, **kwargs)
File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/fastparquet/api.py", line 399, in to_pandas
index=index, assign=parts)
File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/fastparquet/api.py", line 228, in read_row_group
scheme=self.file_scheme)
File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/fastparquet/core.py", line 354, in read_row_group
cats, selfmade, assign=assign)
File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/fastparquet/core.py", line 331, in read_row_group_arrays
catdef=out.get(name+'-catdef', None))
File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/fastparquet/core.py", line 245, in read_col
skip_nulls, selfmade=selfmade)
File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/fastparquet/core.py", line 99, in read_data_page
raw_bytes = _read_page(f, header, metadata)
File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/fastparquet/core.py", line 31, in _read_page
page_header.uncompressed_page_size)
AssertionError: found 120016208 raw bytes (expected None)
```
The corresponding Rust code is:
```
use parquet::{
column::writer::ColumnWriter::BoolColumnWriter,
column::writer::ColumnWriter::Int32ColumnWriter,
file::{
properties::WriterProperties,
writer::\{FileWriter, SerializedFileWriter},
},
schema::parser::parse_message_type,
};
use std::\{fs, rc::Rc};
fn main() {
let schema = "
message schema {
REQUIRED INT32 a;
REQUIRED BOOLEAN b;
}
";
let schema = Rc::new(parse_message_type(schema).unwrap());
let props = Rc::new(
WriterProperties::builder()
.set_statistics_enabled(false)
.set_dictionary_enabled(false)
.build(),
);
let file = fs::File::create("test.parquet").unwrap();
let mut writer = SerializedFileWriter::new(file, schema, props).unwrap();
let batch_size = 1_000_000;
let mut data = vec![];
let mut data_bool = vec![];
for i in 0..batch_size {
data.push(i);
data_bool.push(true);
}
let mut j = 0;
loop {
let mut row_group_writer = writer.next_row_group().unwrap();
let mut col_writer = row_group_writer.next_column().unwrap().unwrap();
if let Int32ColumnWriter(ref mut typed_writer) = col_writer {
typed_writer.write_batch(&data, None, None).unwrap();
} else {
panic!();
}
row_group_writer.close_column(col_writer).unwrap();
let mut col_writer = row_group_writer.next_column().unwrap().unwrap();
if let BoolColumnWriter(ref mut typed_writer) = col_writer {
typed_writer.write_batch(&data_bool, None, None).unwrap();
} else {
panic!();
}
row_group_writer.close_column(col_writer).unwrap();
writer.close_row_group(row_group_writer).unwrap();
j += 1;
if j * batch_size > 40_000_000 {
break;
}
}
writer.close().unwrap()
}
```
Please see the test_2.parquet.tgz for more details.
> [C++][Parquet] ParquetFileReader unable to read files with more than 32767 row groups
> -------------------------------------------------------------------------------------
>
> Key: PARQUET-1857
> URL: https://issues.apache.org/jira/browse/PARQUET-1857
> Project: Parquet
> Issue Type: Bug
> Components: parquet-cpp
> Reporter: Novice
> Assignee: Wes McKinney
> Priority: Critical
> Labels: pull-request-available
> Attachments: test.parquet.tgz, test_2.parquet.tgz
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> I am using Rust to write Parquet file and read from Python.
> When write_batch with 10000 batch size, reading the Parquet file from Python gives the error below:
> ```
> >>> pd.read_parquet("some.parquet", engine="pyarrow")
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "/home//.local/lib/python3.7/site-packages/pandas/io/parquet.py", line 296, in read_parquet
> return impl.read(path, columns=columns, **kwargs)
> File "/home//.local/lib/python3.7/site-packages/pandas/io/parquet.py", line 125, in read
> path, columns=columns, **kwargs
> File "/home//miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 1537, in read_table
> use_pandas_metadata=use_pandas_metadata)
> File "/home//miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 1262, in read
> use_pandas_metadata=use_pandas_metadata)
> File "/home//miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 707, in read
> table = reader.read(**options)
> File "/home//miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 337, in read
> use_threads=use_threads)
> File "pyarrow/_parquet.pyx", line 1130, in pyarrow._parquet.ParquetReader.read_all
> File "pyarrow/error.pxi", line 100, in pyarrow.lib.check_status
> OSError: Unexpected end of stream
> ```
> Also, when using batch size 1 and then read from Python, there is error too:
> ```
> >>> pd.read_parquet("some.parquet", engine="pyarrow")
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "/home/.local/lib/python3.7/site-packages/pandas/io/parquet.py", line 296, in read_parquet
> return impl.read(path, columns=columns, **kwargs)
> File "/home/.local/lib/python3.7/site-packages/pandas/io/parquet.py", line 125, in read
> path, columns=columns, **kwargs
> File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 1537, in read_table
> use_pandas_metadata=use_pandas_metadata)
> File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 1262, in read
> use_pandas_metadata=use_pandas_metadata)
> File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 707, in read
> table = reader.read(**options)
> File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 337, in read
> use_threads=use_threads)
> File "pyarrow/_parquet.pyx", line 1130, in pyarrow._parquet.ParquetReader.read_all
> File "pyarrow/error.pxi", line 100, in pyarrow.lib.check_status
> OSError: The file only has 0 columns, requested metadata for column: 6
> ```
> Using batch size 1000 is fine.
> Note that my data has 450047 rows. Schema:
> ```
> message schema
> { REQUIRED INT32 a; REQUIRED INT32 b; REQUIRED INT32 c; REQUIRED INT64 d; REQUIRED INT32 e; REQUIRED BYTE_ARRAY f (UTF8); REQUIRED BOOLEAN g; }
> ```
>
> EDIT: as I add more rows (estimated 80 millions), using batch size 1000 does not work too:
> ```
> >>> df = pd.read_parquet("data/ping_pong.parquet", engine="pyarrow")
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "/home/.local/lib/python3.7/site-packages/pandas/io/parquet.py", line 296, in read_parquet
> return impl.read(path, columns=columns, **kwargs)
> File "/home/.local/lib/python3.7/site-packages/pandas/io/parquet.py", line 125, in read
> path, columns=columns, **kwargs
> File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 1537, in read_table
> use_pandas_metadata=use_pandas_metadata)
> File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 1262, in read
> use_pandas_metadata=use_pandas_metadata)
> File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 707, in read
> table = reader.read(**options)
> File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 337, in read
> use_threads=use_threads)
> File "pyarrow/_parquet.pyx", line 1130, in pyarrow._parquet.ParquetReader.read_all
> File "pyarrow/error.pxi", line 100, in pyarrow.lib.check_status
> OSError: The file only has 0 columns, requested metadata for column: 6
> ```
> Unless I am using it wrong (which doesn't seem to be, since the API is simple), this is not usable at all :(
>
> EDIT: some more logs, using 1000 batch size, a lot of rows:
> ```
> >>> df = pd.read_parquet("ping_pong.parquet", engine="pyarrow")
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "/home/.local/lib/python3.7/site-packages/pandas/io/parquet.py", line 296, in read_parquet
> return impl.read(path, columns=columns, **kwargs)
> File "/home/.local/lib/python3.7/site-packages/pandas/io/parquet.py", line 125, in read
> path, columns=columns, **kwargs
> File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 1537, in read_table
> use_pandas_metadata=use_pandas_metadata)
> File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 1262, in read
> use_pandas_metadata=use_pandas_metadata)
> File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 707, in read
> table = reader.read(**options)
> File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 337, in read
> use_threads=use_threads)
> File "pyarrow/_parquet.pyx", line 1130, in pyarrow._parquet.ParquetReader.read_all
> File "pyarrow/error.pxi", line 100, in pyarrow.lib.check_status
> OSError: The file only has -959432807 columns, requested metadata for column: 6
> ```
>
> EDIT:
> I wanted to try fastparquet, but seems fastparquet does not support .set_dictionary_enabled(true), so I set it to false.
> Turns out fastparquet is fine, so likely a problem with pyarrow.
> ```
> >>> df = pd.read_parquet("data/ping_pong.parquet", engine="pyarrow")
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "/home/.local/lib/python3.7/site-packages/pandas/io/parquet.py", line 296, in read_parquet
> return impl.read(path, columns=columns, **kwargs)
> File "/home/.local/lib/python3.7/site-packages/pandas/io/parquet.py", line 125, in read
> path, columns=columns, **kwargs
> File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 1281, in read_table
> use_pandas_metadata=use_pandas_metadata)
> File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 1137, in read
> use_pandas_metadata=use_pandas_metadata)
> File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 605, in read
> table = reader.read(**options)
> File "/home/miniconda3/envs/ds/lib/python3.7/site-packages/pyarrow/parquet.py", line 253, in read
> use_threads=use_threads)
> File "pyarrow/_parquet.pyx", line 1136, in pyarrow._parquet.ParquetReader.read_all
> File "pyarrow/error.pxi", line 99, in pyarrow.lib.check_status
> OSError: The file only has -580697109 columns, requested metadata for column: 5
> >>> df = pd.read_parquet("data/ping_pong.parquet", engine="fastparquet")
> ```
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