Hard to say because this comment doesn't show the code that was tried. My proposed change (https://issues.apache.org/jira/secure/attachment/12842717/0001-streaming-add-a-way-to-configure-the-number-of-conne.patch) should open multiple connections per hosts: this fixes blocking writes on a single connection or CPU-bound (de)-serialization.
On Mon, Dec 12, 2016 at 2:04 AM, Nate McCall <zznat...@gmail.com> wrote: > I have not dug too deeply yet, but how would you compare/reconcile > your proposed changes with this comment: > https://issues.apache.org/jira/browse/CASSANDRA-4663?focusedCommentId=15342248&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15342248 > > On Thu, Dec 8, 2016 at 4:10 AM, Corentin Chary <corentin.ch...@gmail.com> > wrote: >> Currently the StreamPlan created for bootstrap (and rebuild) will only >> create one connection per host. If you have less nodes than cores, >> this is likely to be CPU bound (a CPU seems to be able to process >> ~5MB/s). >> >> Is there any reason why something naive like >> https://github.com/iksaif/cassandra/commit/8352c21284811ca15d63183ceae0b11586623f31 >> would not work ? >> >> I believe this is what is about >> https://issues.apache.org/jira/browse/CASSANDRA-4663 >> See also: https://issues.apache.org/jira/browse/CASSANDRA-12229, but I >> don't believe non-blocking I/O would change anything here. >> >> -- >> Corentin Chary >> http://xf.iksaif.net -- Corentin Chary http://xf.iksaif.net
