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
