Hello, I have seen many posts on various sites and MLs, but didn't find a firm answer anywhere: is it possible yes or no to force a smaller split size than a block on the mappers, from the client side? I'm not after pointers to the docs (unless you're very very sure :-) but after real-life experience along the lines of 'yes, it works this way, I've done it like this...'
All the parameters that I could find (especially specifying a max input split size) seem to have no effect, and the files that I have are so heavily compressed that they completely saturate the mappers' memory when processed. A solution I could imagine for this specific issue is reducing the block size, but for now I simply went with disabling in-file compression for those. And changing the block size on a per-file basis is something I'd like to avoid if at all possible. All the hive settings that we tried only got me as far as raising the number of mappers from 5 to 6 (yay!) where I would have needed at least ten times more. Thanks! D.Morel
