Thanks Eric. So addition of new region servers will not impact the regions which I splitted as 3 while writing and reading.
After adding 2 region servers I will change the pre-split to 5 for r/w. On Mon, Sep 19, 2016 at 8:05 PM, Eric Pogrelis <daywalke...@gmail.com> wrote: > V, > > Regionservers (what you said you're adding) and regions are two different > things. If you are manually splitting such that you have only 3 regions, > then if you add additional regionservers, those regionservers may not be > serving any regions. To put that a better way, if you have a single table > with 3 regions, then there are only 4 regions in total -- your 3-region > table + the region for the hbase meta table. So, if you have 5 > regionservers but only 4 regions to be served, then one regionserver will > be idle. To take advantage of the additional regionservers you would want > to modify your split such that there are enough regions that all the > regionservers have a region to serve. > > On Mon, Sep 19, 2016 at 9:16 AM, Viswanathan J <jayamviswanat...@gmail.com > > wrote: > >> Thanks Eric for the update. >> >> Re-balancing will happen automatically, but while writing/reading in >> HBase we're forming the rowkey by pre-splitting based on 3 regions. So if I >> add new regions to the cluster while reading data from 5 rs it will be >> impacted because written data only on 3 regions? >> >> Thanks, >> Viswa.J >> >> On Sun, Sep 18, 2016 at 11:17 PM, Eric Pogrelis <daywalke...@gmail.com> >> wrote: >> >>> Absent other changes, the existing regions will simply be re-balanced >>> across the new region server count of 5. >>> >>> On Fri, Sep 16, 2016 at 9:46 AM, Viswanathan J < >>> jayamviswanat...@gmail.com> wrote: >>> >>>> Hi, >>>> >>>> Currently I have 3 region servers and reading/storing data based on >>>> pre-split(hashing). If I need to add 2 more region servers how it will >>>> impact while reading and writing the data. Because currently pre-split >>>> hashing only based on 3 rs. >>>> >>>> Please help. >>>> >>>> -- >>>> Regards, >>>> Viswa.J >>>> >>>> -- >>>> >>>> --- >>>> You received this message because you are subscribed to the Google >>>> Groups "CDH Users" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to cdh-user+unsubscr...@cloudera.org. >>>> For more options, visit https://groups.google.com/a/cl >>>> oudera.org/d/optout. >>>> >>> >>> -- >>> >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "CDH Users" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to cdh-user+unsubscr...@cloudera.org. >>> For more options, visit https://groups.google.com/a/cl >>> oudera.org/d/optout. >>> >> >> >> >> -- >> Regards, >> Viswa.J >> >> -- >> >> --- >> You received this message because you are subscribed to the Google Groups >> "CDH Users" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to cdh-user+unsubscr...@cloudera.org. >> For more options, visit https://groups.google.com/a/cloudera.org/d/optout >> . >> > > -- > > --- > You received this message because you are subscribed to the Google Groups > "CDH Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to cdh-user+unsubscr...@cloudera.org. > For more options, visit https://groups.google.com/a/cloudera.org/d/optout. > -- Regards, Viswa.J
