80 regions over 5 nodes - that's 16 per server. How big is average region size ? Have you considered splitting existing regions ?
Cheers On Jun 26, 2014, at 12:34 AM, Li Li <fancye...@gmail.com> wrote: > my table has about 700 million rows and about 80 regions. each task > tracker is configured with 4 mappers and 4 reducers at the same time. > The hadoop/hbase cluster has 5 nodes so at the same time, it has 20 > mappers running. it takes more than an hour to finish mapper stage. > The hbase cluster's load is very low, about 2,000 request per second. > I think one mapper for a region is too small. How can I run more than > one mapper for a region so that it can take full advantage of > computing resources?
