Well, looking through logs I confirmed that my understanding below is correct, but would be good to hear from experts for sure š
From: Anubhav Kale [mailto:anubhav.k...@microsoft.com] Sent: Tuesday, January 10, 2017 9:58 AM To: user@cassandra.apache.org Cc: Sean Usher <seus...@exchange.microsoft.com> Subject: RemoveNode CPU Spike Question Hello, Recently, I started noticing an interesting pattern. When I execute āremovenodeā, a subset of the nodes that now own the tokens result it in a CPU spike / disk activity, and sometimes SSTables on those nodes shoot up. After looking through the code, it appears to me that below function forces data to be streamed from some of the new nodes to the node from where āremovenodeā is kicked in. Is my understanding correct ? https://github.com/apache/cassandra/blob/d384e781d6f7c028dbe88cfe9dd3e966e72cd046/src/java/org/apache/cassandra/service/StorageService.java#L2548<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fapache%2Fcassandra%2Fblob%2Fd384e781d6f7c028dbe88cfe9dd3e966e72cd046%2Fsrc%2Fjava%2Forg%2Fapache%2Fcassandra%2Fservice%2FStorageService.java%23L2548&data=02%7C01%7CAnubhav.Kale%40microsoft.com%7C173daa48fcaf4ca6498d08d43982318c%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636196678720784947&sdata=JZ9zWh%2FtJJ%2FbhXXkT41yQhANKaUSBHfP53WraY2vL8M%3D&reserved=0> Our nodes donāt run very hot, but it appears this streaming causes them to have issues. Have other people seen this ? Thanks !
