remove JS/Java for separate JIRA issues

java/vector/src/main/java/org/apache/arrow/vector/ipc/ArrowFileWriter.java

@@ -65,7 +65,6 @@ public class ArrowFileWriter extends ArrowWriter {
 
   @Override
   protected void endInternal(WriteChannel out) throws IOException {
-    out.writeIntLittleEndian(0); // Write an EOS identifier for sequential readers
     long footerStart = out.getCurrentPosition();
     out.write(new ArrowFooter(schema, dictionaryBlocks, recordBlocks), false);
     int footerLength = (int) (out.getCurrentPosition() - footerStart);

js/src/ipc/writer.ts

@@ -314,7 +314,6 @@ export class RecordBatchFileWriter<T extends { [key: string]: DataType } = any>
             this._recordBatchBlocks, this._dictionaryBlocks
         ));
         return this
-            ._writePadding(4) // eos bytes for sequential readers
             ._write(buffer) // Write the flatbuffer
             ._write(Int32Array.of(buffer.byteLength)) // then the footer size suffix
             ._writeMagic(); // then the magic suffix