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From "Simon Gilliot (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8272) BytesWritable length problem
Date Thu, 12 Apr 2012 16:55:17 GMT
BytesWritable length problem
----------------------------

                 Key: HADOOP-8272
                 URL: https://issues.apache.org/jira/browse/HADOOP-8272
             Project: Hadoop Common
          Issue Type: Bug
          Components: io
    Affects Versions: 0.20.205.0
            Reporter: Simon Gilliot


I tried to create my own Writable which contains a BytesWritable.

In my conctructor, I tried to create an empty BytesWritable :
BytesWritable key = new BytesWritable();

Next, in my readFields, I did :
key.readFields(in); LOG.debug(Bytes.toString(key.getBytes()));

The key contains much more bytes than I had wrote.
In fact, if my BytesWritable contains 100 bytes, I thing that the readFields() of BytesWritable
call :
* setSize(0) (which seems useless since the values in the old range are preserved and any
new values are undefined). * setSize(100) which extends the bytes array (by setCapacity) to
1.5 * the size (so 150) without initalizing it
* readFully(bytes, 0, 100) which fill the bytes array from '0' to '100' offsets.

And when I call getBytes() on it, the bytes array of 150 bytes is returned without any control.

That seems possible that the same problem happens in other conditions, when we increase ths
bytes array size.

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