>Why not?  It stops at a particular region?  Can you figure which one.
>Is it not deployed anywhere?   Grep its name in master logs to see if
>you can figure what happened to it? 

It seems that a StackOverflowError happened in my program.

>I don't think we'll be adding such a call; it would imply a full scan
>of the whole table to find every unique column of which there could be
>millions.  If the table is big, it'd need to mapreduce for the result
>to come back in any reasonable amount of time. 

Sorry, St.Ack ,  I'm not very clear about how to mapreduce for the result,
could you explain more about the mapreduce or give me some link? Thanks
again for your kind help!


hongqi

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