Solved! Another tool reading the same files expects various childs of WritableComparable and Writable, this of course won't throw a class cast exception. That same tool writes the using the new class. In essence, i already had a converter tool.
Thanks On Wednesday 30 November 2011 16:44:49 Markus Jelsma wrote: > Hi, > > I've built some SequenceFiles using a custom WritableComparable. I also > decided to reorganize package structure and ended up renaming the whole > thing. Since the key and value classes are embedded in the file i cannot > read them because it either doesn't exist or cannot be cast in case the > same classname lives in another package name. > > I looked in the Job and SequenceFile and InputFormat API's but i cannot > find something to tell the reader that the class is somewhere else now. > Renaming using a hexeditor doesn't work as well because the package name's > length is different now, leading to a lot of bad exceptions such as > Unknown codec complaints. > > I can still load the file by keeping the original WritableComparable and > write back to disk using the new WritableComparable but that forces me to > write some temporary code. > > How can i tell the reader to use the new (but identical) class for > WritableComparable when loading a SequenceFile? Or do i have to write some > conversion code? > > Thanks -- Markus Jelsma - CTO - Openindex
