-Re: Problems with SortedKeyValueFile.Reader: Generic vs Specific Interface
Jeremy Lewi 2012-12-22, 16:53
Thanks Doug. I worked around it by just encoding it and then redecoding it
using specific record.
On Mon, Dec 17, 2012 at 10:31 AM, Doug Cutting <[EMAIL PROTECTED]> wrote:
> A GenericDatumReader will never return a specific record. Perhaps
> this code should use ReflectDatumReader (which will return a java
> class if the named class is loaded or else GenericRecord). The
> changes will be deeper, since this builds on AvroKeyValue which also
> assumes generic, so I can't tell at a glance how difficult this would
> On Sat, Dec 15, 2012 at 11:06 PM, Jeremy Lewi <[EMAIL PROTECTED]> wrote:
> > HI avro-users,
> > I'm having issues with SortedKeyValueFile.Reader. Even though the return
> > type of get is a specific record type, the actual instance returned has
> > GenericRecord. How do I convert this GenericRecord into an instance of my
> > specific record?
> > Looking at the source code SortedKeyValueFile is using the Generic
> > to read the data. But the return type for get is V where I have set V to
> > a specific record. e.g
> > SortedKeyValueFile.Reader<CharSequence, GraphNodeData> where
> > is one of my avro records.
> > I don't understand how this code compiles since the return type is
> > V=GraphNodeData and a GenericRecord can't be cast to a GraphNodeData.
> > Thoughts?
> > Thanks
> > J