Increments are not idempotent, so yes you will double increment the set of increments that succeeded in the first attempt(s). If you care about that you're better off not using the Increment interface and instead having 2 jobs: one that does a Get of the current value and adds the offset then passes through to the next job. The next job would simply save the locally incremented values with a series of Puts. This way you can re-run either job any number of times without double-incrementing anything.
On Mon, Mar 25, 2013 at 10:17 AM, prakash kadel <prakash.ka...@gmail.com>wrote: > hi everyone, > when i launch my mapreduce jobs to increment counters in hbase i > sometimes have maps > with multiple attempts like: > attempt_201303251722_0161_m_000074_0 > attempt_201303251722_0161_m_000074_1 > > if there are multiple attempts running and if the first one gets > completed successful, > what will happen to the increments made by the second attempt > > will there be unnecessary increments due to the second attempt running? > thank you. > > Sincerely > Prakash >
