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From "Jeremy Lewi (Assigned) (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (AVRO-1045) deepCopy of BYTES underflow exception
Date Wed, 14 Mar 2012 17:30:40 GMT

     [ https://issues.apache.org/jira/browse/AVRO-1045?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jeremy Lewi reassigned AVRO-1045:
---------------------------------

    Assignee:     (was: Jeremy Lewi)
    
> deepCopy of BYTES underflow exception
> -------------------------------------
>
>                 Key: AVRO-1045
>                 URL: https://issues.apache.org/jira/browse/AVRO-1045
>             Project: Avro
>          Issue Type: Bug
>          Components: java
>    Affects Versions: 1.6.2
>            Reporter: Jeremy Lewi
>            Priority: Minor
>             Fix For: 1.6.3
>
>         Attachments: AVRO-1045.patch
>
>
> In org.apache.avro.generic.GenericData.deepCopy - the code for copying a ByteBuffer is
>         ByteBuffer byteBufferValue = (ByteBuffer) value;
>         byte[] bytesCopy = new byte[byteBufferValue.capacity()];
>         byteBufferValue.rewind();
>         byteBufferValue.get(bytesCopy);
>         byteBufferValue.rewind();
>         return ByteBuffer.wrap(bytesCopy);
> I think this is problematic because it will cause an UnderFlow exception to be thrown
if the ByteBuffer limit is less than the capacity of the byte buffer.
> My use case is as follows. I have ByteBuffer's backed by large arrays so I can avoid
resizing the array every time I write data. So limit < capacity. When the data is written,
or copied
> I think avro should respect this. When data is serialized, avro should automatically
use the minimum number of bytes.
> When an object is copied, I think it makes sense to preserve the capacity of the underlying
buffer as opposed to compacting it.
> So I think the code could be fixed by replacing get with 
> byteBufferValue.get(bytesCopy, 0 , byteBufferValue.limit());

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