Does balancer_switch=true; rebalances any skew in the existing keys or it only does for all new regions ? The requests seems to be oK across all servers.
On Mon, Apr 23, 2012 at 8:03 PM, David Charle <dbchar2...@gmail.com> wrote: > Thanks Bryan. > > Here is the regions count: > > 1: 2616 > 2: 2620 > 3: 2623 > 4: 2617 > 5: 2617 > > The skew is in Node 2 where we have the space issue (double the size of > other 4 nodes). > > > On Mon, Apr 23, 2012 at 7:50 PM, Bryan Beaudreault < > bbeaudrea...@hubspot.com> wrote: > >> Do all nodes have the same number of regions? If not you may not have the >> balancer on. You can turn it on using balancer_switch true in the hbase >> shell. The balancer also doesn't run if there is a region stuck in >> transition. In this case if your data is growing rapidly I have seen >> regionservers become lopsided until I could clean up the stuck region and >> re-enable the balancer. >> >> Finally, depending on your version of hbase, the balancer only tries to >> keep the number of regions similar across all regionservers. If you have >> tables of different max region sizes I could imagine a case where one >> region server unluckily is hosting more regions from the table with larger >> region sizes. This also might explain the imbalance in requests, if one >> of >> your tables gets more traffic than other. The HMaster UI would be helpful >> for determining the spread of regions per table across regionservers. >> >> On Mon, Apr 23, 2012 at 9:41 PM, David Charle <dbchar2...@gmail.com> >> wrote: >> >> > Hi >> > >> > What can make a region server unbalanced when it comes to space ? (and >> > possibly requests too). >> > >> > For example; I have 5 node cluster (replication factor of 3); and in >> which >> > all 4 has same size; where as one node is almost double in size for >> /hbase. >> > >> > Any help will be appreciated; esp what makes the skew and how to fix it >> ? >> > >> > Thanks >> > David >> > >> > >
