Thanks a lot. Will do as you suggested. On Thu, Sep 8, 2016 at 3:08 PM, Hannu Kröger <hkro...@gmail.com> wrote:
> Ok, so I have to say that I’m not 100% sure how many replicas of data is > it trying to maintain but it should not blow up (if repair crashes or > something, it’s ok). So it should be safe to do. > > When the repair has run you can start with the plan I suggested and run > repairs afterwards. > > Hannu > > On 8 Sep 2016, at 18:01, Benyi Wang <bewang.t...@gmail.com> wrote: > > Thanks. What about this situation: > > * Change RF 2 => 3 > * Start repair > * Roll back RF 3 => 2 > * repair is still running > > I'm wondering what the repair is trying to do? The repair is trying to fix > as RF=2 or still trying to fix like RF=3? > > On Thu, Sep 8, 2016 at 2:53 PM, Hannu Kröger <hkro...@gmail.com> wrote: > >> Yep, you can fix it by running repair or even faster by changing the >> consistency level to local_quorum and deploying the new version of the app. >> >> Hannu >> >> On 8 Sep 2016, at 17:51, Benyi Wang <bewang.t...@gmail.com> wrote: >> >> Thanks Hannu, >> >> Unfortunately, we started changing RF from 2 to 3, and did see the empty >> result rate is going higher. I assume that "If the LOCAL_ONE read hit the >> new replica which is not there yet, the CQL query will return nothing." Is >> my assumption correct? >> >> On Thu, Sep 8, 2016 at 11:49 AM, Hannu Kröger <hkro...@gmail.com> wrote: >> >>> Hi, >>> >>> If you change RF=2 -> 3 first, the LOCAL_ONE reads might hit the new >>> replica which is not there yet. So I would change LOCAL_ONE -> LOCAL_QUORUM >>> first and then change the RF and then run the repair. LOCAL_QUORUM is >>> effectively ALL in your case (RF=2) if you have just one DC, so you can >>> change the batch CL later. >>> >>> Cheers, >>> Hannu >>> >>> > On 8 Sep 2016, at 14:42, Benyi Wang <bewang.t...@gmail.com> wrote: >>> > >>> > * I have a keyspace with RF=2; >>> > * The client read the table using LOCAL_ONE; >>> > * There is a batch job loading data into the tables using ALL. >>> > >>> > I want to change RF to 3 and both the client and the batch job use >>> LOCAL_QUORUM. >>> > >>> > My question is "Will the client still read the correct data when the >>> repair is running at the time my batch job loading is running too?" >>> > >>> > Or should I change to LOCAL_QUORUM first? >>> > >>> > Thanks. >>> >>> >> >> > >
