Allan:
I wonder how you deal with open issues such as HBASE-13535.
>From your description, it seems your team fixed more DLR issues.

Cheers

On Mon, Oct 17, 2016 at 11:37 PM, allanwin <allan...@163.com> wrote:

>
>
>
> Here is the thing. We have backported DLR(HBASE-7006) to our 0.94
> clusters  in production environment(of course a lot of bugs are fixed and
> it is working well). It is was proven to be a huge gain. When a large
> cluster crash down, the MTTR improved from several hours to less than a
> hour. Now, we want to move on to HBase1.x, and still we want DLR. This
> time, we don't want to backport the 'backported' DLR to HBase1.x, but it
> seems like that the community have determined to remove DLR...
>
>
> The DLR feature is proven useful in our production environment, so I think
> I will try to fix its issues in branch-1.x
>
>
>
>
>
>
> At 2016-10-18 13:47:17, "Anoop John" <anoop.hb...@gmail.com> wrote:
> >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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