[jira] [Created] (ARROW-9661) [Java] Failed to read arrow IPC streaming format

["Haowei Yu (Jira)" <ji...@apache.org>]

Haowei Yu created ARROW-9661:
--------------------------------

             Summary: [Java] Failed to read arrow IPC streaming format
                 Key: ARROW-9661
                 URL: https://issues.apache.org/jira/browse/ARROW-9661
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Java
    Affects Versions: 1.0.0
            Reporter: Haowei Yu


I have some bytes, which are in IPC streaming format, but Java failed to read data and give me back error 

```

java.io.IOException: Expected schema but header was 0

```

 

Here is my java code 

```

BufferAllocator allocator = new RootAllocator(Long._MAX_VALUE_);
 ArrayList<ValueVector> valueVectors = new ArrayList<>();
 final ArrayList<List<ValueVector>> batchOfVectors = new ArrayList<>();
 final RootAllocator rootAllocator = new RootAllocator();
 InputStream inputStream = new FileInputStream("/tmp/arrowdata");
 try (ArrowStreamReader reader = new ArrowStreamReader(inputStream, allocator); ) {
   VectorSchemaRoot root = reader.getVectorSchemaRoot();
   while (reader.loadNextBatch()) {
     valueVectors = new ArrayList<>();
 
     for (FieldVector f : root.getFieldVectors()) {
       // transfer will not copy data but transfer ownership of memory
       // from streamReader to resultChunk
       TransferPair t = f.getTransferPair(rootAllocator);
       t.transfer();
       valueVectors.add(t.getTo());
     }
 
     batchOfVectors.add(valueVectors);
     root.clear();
   }
 }

```

 



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