Sorry, I think the comment below is right, but there's some ambiguity, so adding more words.
Each sending host will send each set of tables/keyspaces serially. So the number of concurrent streams is capped by the number of hosts in the cluster (not hosts * RF or hosts * tokens * RF, it's just one per host). If you're using rack aware (or in AWS, AZ-aware) snitches, it's also influenced by the number of hosts in the rack. On Mon, Sep 12, 2022 at 7:16 AM Jeff Jirsa <jji...@gmail.com> wrote: > A new node joining will receive (replication factor) streams for each > token it has. If you use single token and RF=3, three hosts will send data > at the same time (the data sent is the “losing” replica of the data based > on the next/new topology that will exist after the node finishes > bootstrapping m) > > The actual steaming plan is calculated by the joining host, and it > executed the streams concurrently. This is one of the reasons vnodes were > created - many more streaming sources so you can add/remove nodes much > faster > > This is also true of moves and decommissions, but not replacements on the > same token. > > For the display order - I’m not sure what order you’re talking about being > ascending (IP? Perhaps?), but nodetool ring I think displas in token order. > > > > On Sep 12, 2022, at 12:05 AM, Marc Hoppins <marc.hopp...@eset.com> wrote: > > > > It doesn’t. However, I like to know things. Thus, I wanted to know what > determines which nodes send their data in the order they do. > > > > Similarly, when the cluster was created, I added the seeds nodes in > numerically ascending order and then the other nodes in a similar fashion. > So why doesn’t nodetool display the status in that same order? > > > > *From:* Gil Ganz <gilg...@gmail.com> > *Sent:* Monday, September 12, 2022 8:50 AM > *To:* user@cassandra.apache.org > *Subject:* Re: Bootstrap data streaming order > > > > EXTERNAL > > I can understand why the number of nodes sending at once might be > interesting somehow, but why would the order of the nodes matter? > > > > On Fri, Sep 9, 2022 at 10:27 AM Marc Hoppins <marc.hopp...@eset.com> > wrote: > > Curiosity as to which data/node starts first, what determines the delivery > sequence, how many nodes send data at once and what determines that limit? > > The usual kind of questions. > > > > -----Original Message----- > From: Dinesh Joshi <djo...@apache.org> > Sent: Friday, September 9, 2022 9:14 AM > To: user@cassandra.apache.org > Subject: Re: Bootstrap data streaming order > > EXTERNAL > > > The data is requested asynchronously from peers. There is some logic to > select the peers however there isn’t a set order for data delivery. Why do > you ask? > > > > > On Sep 8, 2022, at 11:35 PM, Marc Hoppins <marc.hopp...@eset.com> wrote: > > > > Hulloa all, > > > > Can anyone shed light on the order which nodes will deliver data to a > new node? Or point me toward a suitable chart/document? > > > > Does the new node accept data from each node in turn or simultaneously > from multiple nodes? > > > > Thanks > > > > Marc > >
