On Wed, Sep 14, 2011 at 8:42 AM, Geoff Hendrey <[email protected]> wrote: > 17 MR nodes, 8 reducers per machine = 138 concurrent reducers. > (machines are 12-core, and I've found 8 reducers with 1GB allocated heap to > be a happy medium that doesn't freeze out the data nodes or the region > servers - or so I think :-). >
Are you swapping at all? What if you restored your config. to something sane -- 100 handlers with queue size of 10, default timeout -- with 1/4 of the reducers? What does this MR job do? St.Ack
