correct. you can run it in parallel across many nodes if you have capacity. generally see about a 10% CPU increase from cleanups which isn't a big deal if you have the capacity to handle it + the io.
on that note on later versions you can specify -j <num jobs> to run multiple cleanup compactions at the same time on a single node, and also increase compaction throughput to speed the process up. On 27 Sep. 2017 13:20, "Peng Xiao" <2535...@qq.com> wrote: hi, nodetool cleanup will only remove those keys which no longer belong to those nodes,than theoretically we can run nodetool cleanup in parallel,right?the document suggests us to run this one by one,but it's too slow. Thanks, Peng Xiao
