Gratzi Eric for the correction on Zookeeper... On Tue, Oct 18, 2016 at 1:48 PM, Erick Erickson <erickerick...@gmail.com> wrote:
> bq: ...whether it's OK to just copy the data files between 4.3 and 6.x > > NOT ok. Solr (well, Lucene really) guarantees to read _one_ major version > behind. So a Solr 5x will read a solr 4x. But a Solr 6x is not guaranteed > at all to read a 4x. And in fact removing back-compat complexification is > one of the benefits of moving to a new major version. > > You can use the 5x IndexUpgraderTool to migrate from 4x->5x, then run > 6x over the upgraded index. > > All that said, I completely agree with John's advice to re-index entirely > from scratch if at all possible. > > ********** > It's perfectly possible to run with a single Zookeeper. The quorum > formula is N/2 + 1. If you only have 1 ZK node, then 1 represents > quorum. It's just not advisable. Zk is responsible for presenting the > cluster topology to the entire set of Solr instances, you want it > to be robust so 3 is the recommended minimum. BTW, It's quite rare > to need more than that unless you're at pretty massive scale (hundreds > of Solr instances and/or collections), and even in these cases it's > usually best to use Observers.... > > FWIW, > Erick > > On Tue, Oct 18, 2016 at 2:28 PM, John Bickerstaff > <j...@johnbickerstaff.com> wrote: > > For what it's worth, (and it may not work for your situation) I decided > not > > to upgrade, but to "upgrade by replacing". In other words, I just > > installed 6.x and because I had set up my configs for "include" I didn't > > have to worry about what would be different about the "new" > solrconfig.xml > > and the managed_schema file. Instead, I was able to use a copy from one > of > > the sample projects and add my "included" configs. > > > > Then, after creating the same collection structure in 6.x that I had in > my > > 5.x instances, I just re-indexed everything into the new 6.x Solr. > > > > The big deal (probably) is whether it will cost you days to re-index and > > whether you have the resources to do that. > > > > I don't know if the index remained the same because I didn't have to > > trouble myself with that due to the replacement. I'm sure others on the > > list can tell us whether it's OK to just copy the data files between 4.3 > > and 6.x (I'd guess not...) > > > > By the way - unless I misunderstand the Zookeeper docs, you can't get > away > > with any less than 3 Zookeeper nodes. So keep that in mind. > > > > I have my rough notes about what I did available online. You can go here > > for the link... > > > > https://www.linkedin.com/pulse/actual-solrcloud-vms- > zookeeper-nodes-john-bickerstaff > > > > > > > > > > > > > > On Tue, Oct 18, 2016 at 11:28 AM, sputul <sputu...@gmail.com> wrote: > > > >> We are using Solr 4.3, sing Zoopeeker on development manage Solr Cloud > >> having > >> one or two nodes. Will it be easier to migrate to Solr 5 first or > should I > >> migrate to Solr 6 directly? I see Core definition has changed. Anything > >> else > >> worth noting? > >> > >> The goal is to also use HTTPS perhaps after everything works in my local > >> environment using Single Zookeeper and a one or more Solr Nodes. Thanks. > >> > >> > >> > >> -- > >> View this message in context: http://lucene.472066.n3. > >> nabble.com/Migration-from-Solr-4-tp4301788.html > >> Sent from the Solr - User mailing list archive at Nabble.com. > >> >
