We've tested with C* 2.1.14 version Yes VNodes with 256 tokens Once all the nodes in dc2 are added, schema is modified to have RF=3 in dc1 and RF=3 in dc2. Then on each nodes of dc2: nodetool rebuild dc1 Le 14 juin 2016 10:39, "kurt Greaves" <k...@instaclustr.com> a écrit :
> What version of Cassandra are you using? Also what command are you using > to run the rebuilds? Are you using vnodes? > > On 13 June 2016 at 09:01, Fabien Rousseau <fabifab...@gmail.com> wrote: > >> Hello, >> >> We've tested adding a new DC from an existing DC having 3 nodes and RF=3 >> (ie all nodes have all data). >> During the rebuild process, only one node of the first DC streamed data >> to the 3 nodes of the second DC. >> >> Our goal is to minimise the time it takes to rebuild a DC and would like >> to be able to stream from all nodes. >> >> Starting C* with debug logs, it appears that all nodes, when computing >> their "streaming plan" returns the same node for all ranges. >> This is probably because all nodes in DC2 have the same view of the ring. >> >> I understand that when bootstrapping a new node, it's preferable to >> stream from the node being replaced, but when rebuilding a new DC, it >> should probably select sources "randomly" (rather than always selecting the >> same source for a specific range). >> What do you think ? >> >> Best Regards, >> Fabien >> > > > > -- > Kurt Greaves > k...@instaclustr.com > www.instaclustr.com >
