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https://issues.apache.org/jira/browse/ARROW-1047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16227286#comment-16227286
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ASF GitHub Bot commented on ARROW-1047:
---------------------------------------
elahrvivaz commented on a change in pull request #1259: ARROW-1047: [Java] Add
Generic Reader Interface for Stream Format
URL: https://github.com/apache/arrow/pull/1259#discussion_r148088136
##########
File path:
java/vector/src/main/java/org/apache/arrow/vector/ipc/message/MessageSerializer.java
##########
@@ -377,8 +371,8 @@ public static ArrowDictionaryBatch
deserializeDictionaryBatch(ReadChannel in,
return new ArrowDictionaryBatch(dictionaryBatchFB.id(), recordBatch);
}
- public static ArrowMessage deserializeMessageBatch(ReadChannel in,
BufferAllocator alloc) throws IOException {
- Message message = deserializeMessage(in);
+ public static ArrowMessage deserializeMessageBatch(MessageReader reader,
BufferAllocator alloc) throws IOException {
Review comment:
this method won't read any generic message, it only works with RecordBatches
or DictionaryBatches, hence the name...
in the streaming format the first message after the schema could be either a
record batch or a dictionary batch, this method is to handle either case.
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> [Java] Add generalized stream writer and reader interfaces that are decoupled
> from IO / message framing
> -------------------------------------------------------------------------------------------------------
>
> Key: ARROW-1047
> URL: https://issues.apache.org/jira/browse/ARROW-1047
> Project: Apache Arrow
> Issue Type: New Feature
> Components: Java - Vectors
> Reporter: Wes McKinney
> Assignee: Bryan Cutler
> Labels: pull-request-available
>
> cc [~julienledem] [~elahrvivaz] [~nongli]
> The ArrowWriter
> https://github.com/apache/arrow/blob/master/java/vector/src/main/java/org/apache/arrow/vector/file/ArrowWriter.java
> accepts a WriteableByteChannel where the stream is written
> It would be useful to be able to support other kinds of message framing and
> transport, like GRPC or HTTP. So rather than writing a complete Arrow stream
> as a single contiguous byte stream, the component messages (schema,
> dictionaries, and record batches) would be framed as separate messages in the
> underlying protocol.
> So if we were using ProtocolBuffers and gRPC as the underlying transport for
> the stream, we could encapsulate components of an Arrow stream in objects
> like:
> {code:language=protobuf}
> message ArrowMessagePB {
> required bytes serialized_data;
> }
> {code}
> If the transport supports zero copy, that is obviously better than
> serializing then parsing a protocol buffer.
> We should do this work in C++ as well to support more flexible stream
> transport.
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