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[jira] [Created] (ARROW-3256) [JS] File footer and message metadata is inconsistent


Wes McKinney created ARROW-3256:
-----------------------------------

             Summary: [JS] File footer and message metadata is inconsistent
                 Key: ARROW-3256
                 URL: https://issues.apache.org/jira/browse/ARROW-3256
             Project: Apache Arrow
          Issue Type: Bug
          Components: JavaScript
            Reporter: Wes McKinney
             Fix For: JS-0.4.0


I added some assertions to the C++ library and found that the body length in the file footer and the IPC message were different

{code}
##########################################################
JS producing, C++ consuming
##########################################################
==========================================================
Testing file /home/travis/build/apache/arrow/integration/data/struct_example.json
==========================================================
-- Creating binary inputs
node --no-warnings /home/travis/build/apache/arrow/js/bin/json-to-arrow.js -a /tmp/tmplbm3vbwz/3d2269c960f148b6b94e5f881c0bf9ca_struct_example.json_to_arrow -j /home/travis/build/apache/arrow/integration/data/struct_example.json
-- Validating file
/home/travis/build/apache/arrow/cpp-build/debug/json-integration-test --integration --arrow=/tmp/tmplbm3vbwz/3d2269c960f148b6b94e5f881c0bf9ca_struct_example.json_to_arrow --json=/home/travis/build/apache/arrow/integration/data/struct_example.json --mode=VALIDATE
Command failed: /home/travis/build/apache/arrow/cpp-build/debug/json-integration-test --integration --arrow=/tmp/tmplbm3vbwz/3d2269c960f148b6b94e5f881c0bf9ca_struct_example.json_to_arrow --json=/home/travis/build/apache/arrow/integration/data/struct_example.json --mode=VALIDATE
With output:
--------------
/home/travis/build/apache/arrow/cpp/src/arrow/ipc/reader.cc:581 Check failed: (message->body_length()) == (block.body_length)
{code}

It appears that the order of the lengths is flipped in

https://github.com/apache/arrow/blob/master/js/src/ipc/writer/binary.ts#L77



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