Nong Li created ARROW-474:
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Summary: Create an Arrow streaming file fomat
Key: ARROW-474
URL: https://issues.apache.org/jira/browse/ARROW-474
Project: Apache Arrow
Issue Type: Improvement
Reporter: Nong Li
It would be helpful to have a file/container layout that allows for streaming
consumer and producers of arrow data.
As a motivating example, a reader could have this API:
Iterator<Record> read(java.io.InputStream source).
Similar a writer can have:
void write(RecordBatch, java.io.OutputStream dest)
The streams can be from a variety of sources: it be files, over the network,
shared memory, pipe, etc. The layout would make it possible to implement
both APIs without requiring intermediate buffering.
Speaking with Julien, this involves creating a simple container format similar
to ARROW-264 but suitable for streaming consumer and producers. The layout in
ARROW-264 has the schema at the end so can't be used in a streaming way. This
format would likely be a rearranging of the current File layout pieces,
something similar to:
MAGIC, schema, totalBatches, (RecordBatchHeader, RecordBatchBody)*, MAGIC (or
some end marker)
totalBatches is optional for streaming producers that don't know.
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