There may be other things, but off the top of my head, Streaming expressions and TRA's are not available in "legacy"...
On Thu, Aug 6, 2020 at 11:49 AM Cassandra Targett <casstarg...@gmail.com> wrote: > On Aug 6, 2020, 10:22 AM -0500, Gus Heck <gus.h...@gmail.com>, wrote: > > WRT the name "uncoordinated mode" I fear it could be read (or even become > known as) as "clumsy mode" which is humorous but possibly not what we're > going for :) > > > I had also considered “non-coordinated”, and prefer it but couldn’t > articulate why. The association of “uncoordinated" with clumsiness might be > what was bugging me. > > I'd perhaps suggest Cluster mode for SolrCloud though I'm not entirely > sure if Legacy Solr (in curren parlance) is not a "cluster" too, cluster > being a somewhat vague term. However Clustered Mode and Legacy Mode seem > more on target. I think "Legacy" could be changed since we're not really > planning on abandoning it (are we?), but > > > One can have a cluster and not run SolrCloud. I think from an operations > perspective, several servers all running Solr is considered a cluster, no > matter what tools are being used to get them to talk to each other. > > I think “Legacy” (also used today already in some contexts) is problematic > because there aren’t plans to abandon it. Also “Legacy replication” is > pretty close to exactly what PULL replicas use to poll leaders and pull new > index segments when needed. IOW, it’s not “legacy”, it’s very actively > being used in a growing number of clusters. That might be an implementation > detail users aren’t aware of, but I feel the term is really lacking mostly > in that it just doesn’t say anything besides “it’s older”. > > the adjective there SHOULD communicate reduced functionality because there > are plenty of features that are cloud (cluster) only. > > > In my view, the reduced functionality of non-SolrCloud clusters is mostly > around coordination of requests, leader election, configs, and other > similar automated activities one does manually otherwise. So, I feel that > sort of proves my point - a word that conveys lack of coordination is a > good option for what it’s called. If there is a better antonym for > “coordinated”, I’m all for considering it but haven’t yet been able to > think of/find one. > > I think it’s important to think about what differentiates the two ways of > managing a Solr cluster and derive the naming from that. What features of > SolrCloud don’t exist in the non-SolrCloud approach? What words help us > generalize those gaps and can any of them be an appropriate name? > > > -Gus > > > On Thu, Aug 6, 2020 at 10:27 AM Cassandra Targett <casstarg...@gmail.com> > wrote: > > The work in SOLR-14702 has left us with some awkward phrasing (which is > still better than what it was) around non-SolrCloud clusters that I've > offered to help fix. > > > I think we've struggled for years to find a good name for non-SolrCloud > clusters and we've used a number of variations: "legacy replication" (which > it isn't, since PULL replicas use the same thing), "Standalone mode" (which > it isn't because it's a cluster), now "leader/follower mode" (which could > be confusing because SolrCloud has leaders). > > > Yesterday I thought about what really differentiates a SolrCloud cluster > and a non-SolrCloud cluster and it occurred to me that a key difference is > the former is coordinated by ZooKeeper, while the latter is not. That led > me to think that perhaps "coordinated mode" can someday be a better > replacement for the term "SolrCloud", while "uncoordinated mode" could be a > replacement today for all these other non-SolrCloud mode variations. > > > I've opened https://issues.apache.org/jira/browse/SOLR-14716 and will > create a branch for work in progress, but before I forge too far ahead, I > want to draw attention to it first to give a chance for discussion so we're > in agreement. > > > Thanks, > > Cassandra > > > > -- > > http://www.needhamsoftware.com (work) > > http://www.the111shift.com (play) > > -- http://www.needhamsoftware.com (work) http://www.the111shift.com (play)
