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Date: Mon, 28 Oct 2013 18:03:55 -0700
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Subject: Re: HBase Replication Questions
From: hdev ml <hdevml@gmail.com>
To: user@hbase.apache.org
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Thanks Ted. Will take a look at it.


On Mon, Oct 28, 2013 at 3:33 PM, Ted Yu <yuzhihong@gmail.com> wrote:

> Please see also 'Replication Metrics' at the bottom of
> http://hbase.apache.org/replication.html
>
>
> On Mon, Oct 28, 2013 at 3:23 PM, hdev ml <hdevml@gmail.com> wrote:
>
> > Thanks Demai. Need to find out how to access HBase metrics.
> >
> > But thanks for your insights.
> > Harshad
> >
> >
> > On Mon, Oct 28, 2013 at 2:45 PM, Demai Ni <nidmgg@gmail.com> wrote:
> >
> > > 1)  you can use replication metrics info such as:ageOfLastShippedOp,
> > > timeStampsOfLastShippedOp, sizeOfLogQueue ageOfLastAppliedOp, and
> > > timeStampsOfLastAppliedOp to figure out the lag.
> > > 2) with my best knowledge, the replication won't be together with
> > snapshot.
> > > That is the peers won't know there is a restore occurred on primary.
> So a
> > > user must take care it manually.   the VerifyReplication tool may be
> > > helpful to identify which data (boundary by timestamps) is mismatch, so
> > the
> > > copyTable doesn't have to copy the whole table
> > >
> > > Demai
> > >
> > > Demai
> > >
> > >
> > > On Mon, Oct 28, 2013 at 12:07 PM, hdev ml <hdevml@gmail.com> wrote:
> > >
> > > > Hello all,
> > > >
> > > > I have a couple of questions for HBase.
> > > >
> > > > 1. Is there any way to find out by how much time the replication is
> > > lagging
> > > > on the peer cluster or even primary cluster is ok.
> > > > 2. Say replication is going on for some time for a table and then you
> > > > restore a snapshot on the Primary. Would replication catch up with
> the
> > > > restore snapshot? Or do I have to treat that as replicating from
> > scratch,
> > > > meaning
> > > >
> > > >    1. disable peer
> > > >    2. restore snapshot on primary
> > > >    3. copyTable upto disable timestamp
> > > >    4. enable peer
> > > >
> > > >
> > > > Any help is appreciated.
> > > >
> > > > Thanks
> > > >
> > > > Harshad
> > > >
> > >
> >
>

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