Yup that's the responsibility of namenode to control under and over replicated blocks automatically, However you can you balancer script any time.
Thanks On Fri, Aug 16, 2013 at 2:09 PM, bharath vissapragada < bharathvissapragada1...@gmail.com> wrote: > No, namenode deletes over-replicated blocks after some time.! > > > On Fri, Aug 16, 2013 at 2:03 PM, ch huang <justlo...@gmail.com> wrote: > >> hi,all: >> if i have three data node, and data block replicator number is 2, one of >> data node failed,so it's data block on it will move to another alive DN,the >> replicator still be >> 3 ,what if the failed DN recover ,the replicator will become 4? >> > >
