Thanks, Created the issue: https://issues.apache.org/jira/browse/CASSANDRA-12015
2016-06-15 15:25 GMT+02:00 Paulo Motta <pauloricard...@gmail.com>: > For rebuild, replace and -Dcassandra.consistent.rangemovement=false in > general we currently pick the closest replica (as indicated by the Snitch) > which has the range, what will often map to the same node due to the > dynamic snitch, specially when N=RF. This is good for picking a node in the > same DC or rack for transferring, but we can probably improve this to > distribute streaming load more evenly within candidate source nodes in the > same rack/DC. > > Would you mind opening a ticket for improving this? > > > 2016-06-14 17:35 GMT-03:00 Fabien Rousseau <fabifab...@gmail.com>: > >> 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 >>> >> >
