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 <yuzhih...@gmail.com> 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 <allan...@163.com> 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" <yuzhih...@gmail.com> 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 <allan...@163.com> 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
>>

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