Agree with ur observation.. But DLR feature we wanted to get removed.. Because it is known to have issues.. Or else we need major work to correct all these issues.
-Anoop- On Tue, Oct 18, 2016 at 7:41 AM, Ted Yu <[email protected]> wrote: > If you have a cluster, I suggest you turn on DLR and observe the effect > where fewer than half the region servers are up after the crash. > You would have first hand experience that way. > > On Mon, Oct 17, 2016 at 6:33 PM, allanwin <[email protected]> wrote: > >> >> >> >> Yes, region replica is a good way to improve MTTR. Specially if one or two >> servers are down, region replica can improve data availability. But for big >> disaster like 1/3 or 1/2 region servers shutdown, I think DLR still useful >> to bring regions online more quickly and with less IO usage. >> >> >> Regards >> Allan Yang >> >> >> >> >> >> >> At 2016-10-17 21:01:16, "Ted Yu" <[email protected]> wrote: >> >Here was the thread discussing DLR: >> > >> >http://search-hadoop.com/m/YGbbOxBK2n4ES12&subj=Re+ >> DISCUSS+retiring+current+DLR+code >> > >> >> On Oct 17, 2016, at 4:15 AM, allanwin <[email protected]> wrote: >> >> >> >> Hi, All >> >> DLR can improve MTTR dramatically, but since it have many bugs like >> HBASE-13567, HBASE-12743, HBASE-13535, HBASE-14729(any more I'don't know?), >> it was proved unreliable, and has been deprecated almost in all branches >> now. >> >> >> >> >> >> My question is, is there any other way other than DLR to improve MTTR? >> 'Cause If a big cluster crashes, It takes a long time to bring regions >> online, not to mention it will create huge pressure on the IOs. >> >> >> >> >> >> To tell the truth, I still want DLR back, if the community don't have >> any plan to bring back DLR, I may want to figure out the problems in DLR >> and make it working and reliable, Any suggests for that? >> >> >> >> >> >> sincerely >> >> Allan Yang >>
