inlined.
On Thu, Oct 27, 2016 at 3:01 PM, Stack wrote:
> On Fri, Oct 21, 2016 at 3:24 PM, Enis Söztutar wrote:
>
> > A bit late, but let me give my perspective. This can also be moved to
> jira
> > or dev@ I think.
> >
> > DLR was a nice and had pretty good gains for MTTR. However, dealing with
On Thu, Oct 27, 2016 at 3:01 PM, Stack wrote:
> On Fri, Oct 21, 2016 at 3:24 PM, Enis Söztutar wrote:
>
>> A bit late, but let me give my perspective. This can also be moved to jira
>> or dev@ I think.
>>
>> DLR was a nice and had pretty good gains for MTTR. However, dealing with
>> the sequence
On Fri, Oct 21, 2016 at 3:24 PM, Enis Söztutar wrote:
> A bit late, but let me give my perspective. This can also be moved to jira
> or dev@ I think.
>
> DLR was a nice and had pretty good gains for MTTR. However, dealing with
> the sequence ids, onlining regions etc and the replay paths proved t
Hi all
We are also considering how to improve MTTR these days and have a plan. I
just notice this thread, hoping I am not late :)
My original thought is simple: Why we must put entries to MemStore of new
RS? We can read/write WAL entries only once in failover, from log entries
to HFiles, which is
A bit late, but let me give my perspective. This can also be moved to jira
or dev@ I think.
DLR was a nice and had pretty good gains for MTTR. However, dealing with
the sequence ids, onlining regions etc and the replay paths proved to be
too difficult in practice. I think the way forward would be
Allan:
One factor to consider is that the assignment manager in hbase 2.0 would be
quite different from those in 0.98 and 1.x branches.
Meaning, you may need to come up with two solutions for a single problem.
FYI
On Tue, Oct 18, 2016 at 6:11 PM, Allan Yang wrote:
> Hi, Ted
> These issues I me
Hi, Ted
These issues I mentioned above(HBASE-13567, HBASE-12743, HBASE-13535,
HBASE-14729) are ALL reproduced in our HBase1.x test environment. Fixing them
is exactly what I'm going to do. I haven't found the root cause yet, but I
will update if I find solutions.
what I afraid is that, there a
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 wrote:
>
>
>
> Here is the thing. We have backported DLR(HBASE-7006) to our 0.94
> clusters in production envir
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,
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 wrote:
> If you have a cluster, I suggest you turn on DLR and observe the effect
>
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 wrote:
>
>
>
> Yes, region replica is a good way to improve MTTR. Spec
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.
Rega
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 wrote:
>
> Hi, All
> DLR can improve MTTR dramatically, but since it have many bugs like
> HBASE-13567, HBASE-12743, HBASE-13535, HB
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 impro
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