Tthere is this really really cool feature in gemfire for conflict
resolution(and I hope hbase has something similar here as it seems so
clean).  You can implement an interface that gets called just before the
write to storage that gives you the old value and the new value(and is
single threaded for that row so multiple updates on that row are in same
thread).  

 

Perfect example

Key="myCar" value=contains people A, B, C version 4

 

A put done from node 1 and a put done from node 2 at the same time

1.       Put people A, B, C, D version 4

2.       Put people A, B, C, E version 4

 

So the conflict resolver can put 1 fine but then on 2, it can see that
version is 5 on oldValue and can merge A, b, C, E with A, B, C, D
resulting in the full list A, B, C, D, E.  this is a dang nice feature.

 

Does hbase have something similar that one can implement that gets
called on each node out there to do conflict resolution?

 

Thanks,

Dean

 

 


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