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https://issues.apache.org/jira/browse/ARROW-14263?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Bryan Ashby updated ARROW-14263:
--------------------------------
Description:
I'm running into various exceptions (often: "Invalid flatbuffers message") when
attempting to de-serialize RecordBatch's in Python that were generated in C++.
The same batch can be de-serialized back within C++.
*Example (C++)* (status checks omitted, but they are check in real code)*:*
{code:java}
const auto stream = arrow::io::BufferOutputStream::Create();
{
const auto writer = arrow::ipc::MakeStreamWriter(*stream, schema);
sdk::MaybeThrowError(writer);
const auto writeRes = (*writer)->WriteRecordBatch(batch);
sdk::MaybeThrowError((*writer)->Close());
}
auto buffer = (*stream)->Finish();std::ofstream
ofs("record-batch-large.arrow"); // we'll read this in Python
ofs.write(reinterpret_cast<const char*>((*buffer)->data()), (*buffer)->size());
ofs.close();
auto backAgain = DeserializeRecordBatch((*buffer)); // all good
{code}
*Then in Python*:
{code:java}
with open("record-batch-large.arrow", "rb") as f:
data = f.read()reader = pa.RecordBatchStreamReader(data) // throws here
- "Invalid flatbuffers message"
{code}
Please see the attached .arrow file (produced above).
Any ideas?
was:
I'm running into various exceptions (often: "Invalid flatbuffers message") when
attempting to de-serialize RecordBatch's in Python that were generated in C++.
The same batch can be de-serialized back within C++.
*Example (C++)* (status checks omitted, but they are check in real code)*:*
{code:java}
const auto stream = arrow::io::BufferOutputStream::Create();
{
const auto writer = arrow::ipc::MakeStreamWriter(*stream, schema);
sdk::MaybeThrowError(writer);
const auto writeRes = (*writer)->WriteRecordBatch(batch);
sdk::MaybeThrowError((*writer)->Close());
}
auto buffer = (*stream)->Finish();std::ofstream
ofs("record-batch-large.arrow"); // we'll read this in Python
ofs.write(reinterpret_cast<const char*>((*buffer)->data()), (*buffer)->size());
ofs.close();auto backAgain = DeserializeRecordBatch((*buffer)); // all good
{code}
*Then in Python*:
{code:java}
with open("record-batch-large.arrow", "rb") as f:
data = f.read()reader = pa.RecordBatchStreamReader(data) // throws here
- "Invalid flatbuffers message"
{code}
Please see the attached .arrow file (produced above).
Any ideas?
> "Invalid flatbuffers message" thrown with some serialized RecordBatch's
> -----------------------------------------------------------------------
>
> Key: ARROW-14263
> URL: https://issues.apache.org/jira/browse/ARROW-14263
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++, Python
> Affects Versions: 5.0.0
> Environment: pyarrow==5.0.0
> C++ = 5.0.0
> Windows 10 Pro x64
> Reporter: Bryan Ashby
> Priority: Major
> Attachments: record-batch-large.arrow
>
>
> I'm running into various exceptions (often: "Invalid flatbuffers message")
> when attempting to de-serialize RecordBatch's in Python that were generated
> in C++.
> The same batch can be de-serialized back within C++.
> *Example (C++)* (status checks omitted, but they are check in real code)*:*
> {code:java}
> const auto stream = arrow::io::BufferOutputStream::Create();
> {
> const auto writer = arrow::ipc::MakeStreamWriter(*stream, schema);
> sdk::MaybeThrowError(writer);
> const auto writeRes = (*writer)->WriteRecordBatch(batch);
> sdk::MaybeThrowError((*writer)->Close());
> }
> auto buffer = (*stream)->Finish();std::ofstream
> ofs("record-batch-large.arrow"); // we'll read this in Python
> ofs.write(reinterpret_cast<const char*>((*buffer)->data()),
> (*buffer)->size());
> ofs.close();
> auto backAgain = DeserializeRecordBatch((*buffer)); // all good
> {code}
> *Then in Python*:
> {code:java}
> with open("record-batch-large.arrow", "rb") as f:
> data = f.read()reader = pa.RecordBatchStreamReader(data) // throws here
> - "Invalid flatbuffers message"
> {code}
> Please see the attached .arrow file (produced above).
> Any ideas?
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