BytesWritable writes the size of the byte array as an int (4 bytes)
then the contents of the byte array ("text".getBytes() == 4), so a
total of 8 bytes in total
On Sat, Mar 31, 2012 at 6:50 PM, Tom Melendez <t...@supertom.com> wrote:
> Hi Chris and all, hope you don't mind if I inject a question in here.
> It's highly related IMO (famous last words).
>
> On Sat, Mar 31, 2012 at 2:18 PM, Chris White <chriswhite...@gmail.com> wrote:
>> You can serialize your Writables to a ByteArrayOutputStream and then
>> get it's underlying byte array:
>>
>> ByteArrayOutputStream baos = new ByteArrayOutputStream();
>> DataOutputStream dos = new DataOutputStream(baos);
>> Writable myWritable = new Text("text");
>> myWritable.write(dos);
>> byte[] bytes = baos.toByteArray();
>>
>
> I popped in this into a quick test and it failed. What I want are the
> exact bytes back from the Writable (in my case, BytesWritable). So,
> this fails for me:
>
> @Test
> public void byteswritabletest() {
> ByteArrayOutputStream baos = new ByteArrayOutputStream();
> DataOutputStream dos = new DataOutputStream(baos);
> BytesWritable myBW = new BytesWritable("test".getBytes());
> try {
> myBW.write(dos);
> } catch (IOException e) {
> e.printStackTrace();
> }
> byte[] bytes = baos.toByteArray();
> assertEquals("test".getBytes().length, bytes.length); //I get
> expected: 4, actual 8 with this assertion
> }
>
>
> I see that in new versions of Text and BytesWritable, there is a
> .copyBytes() method that is available that gives us that.
> https://reviews.apache.org/r/182/diff/
>
> Is there another way (without the upgrade) to achieve that?
>
> Thanks,
>
> Tom
