# \#topology-change **URL:** https://forum.scylladb.com/tag/topology-change/165.md [Latest](https://forum.scylladb.com/latest.md) · [Categories](https://forum.scylladb.com/categories.md) · [Tags](https://forum.scylladb.com/tags.md) --- ## [Topology coordinator appears idle after cleanup incident — new node joins placed but never processed (6.1.1)](https://forum.scylladb.com/t/topology-coordinator-appears-idle-after-cleanup-incident-new-node-joins-placed-but-never-processed-6-1-1/5345)
**Author:** [@lbowley](https://forum.scylladb.com/u/lbowley)\ **Replies:** 1\ **Last updated:** [September 1, 2026, 11:02am UTC](https://forum.scylladb.com/t/topology-coordinator-appears-idle-after-cleanup-incident-new-node-joins-placed-but-never-processed-6-1-1/5345 "2026-09-01T11:02:03Z")
Version: Scylla 6.1.1-0.20240814.8d90b817660a Topology: 12 nodes, single DC (us-east), single rack, Ec2Snitch. Raft-based topology. Tablets not in use. State: All 12 UN, single schema version, quiet (no compactions, no… --- ## [How do I debug latency spikes when there haven't been any changes to my query patterns or app workload?](https://forum.scylladb.com/t/how-do-i-debug-latency-spikes-when-there-havent-been-any-changes-to-my-query-patterns-or-app-workload/5368)
**Author:** [@Guy](https://forum.scylladb.com/u/Guy)\ **Replies:** 1\ **Last updated:** [May 18, 2026, 12:30pm UTC](https://forum.scylladb.com/t/how-do-i-debug-latency-spikes-when-there-havent-been-any-changes-to-my-query-patterns-or-app-workload/5368 "2026-05-18T12:30:51Z")
For example, after a recent OS upgrade, kernel change or Scylla version upgrade. Also, how can I find hotspots on specific CPU cores? I’d like to better understand the CPU usage and find the bottlenecks. --- ## [How can I add/remove large nodes? This operation frequently fails for different reasons](https://forum.scylladb.com/t/how-can-i-add-remove-large-nodes-this-operation-frequently-fails-for-different-reasons/5282)
**Author:** [@Guy](https://forum.scylladb.com/u/Guy)\ **Replies:** 3\ **Last updated:** [March 8, 2026, 8:14am UTC](https://forum.scylladb.com/t/how-can-i-add-remove-large-nodes-this-operation-frequently-fails-for-different-reasons/5282 "2026-03-08T08:14:04Z")
--- ## [Stuck topology request after increasing replication factor](https://forum.scylladb.com/t/stuck-topology-request-after-increasing-replication-factor/5202)
**Author:** [@di-hardt](https://forum.scylladb.com/u/di-hardt)\ **Replies:** 2\ **Last updated:** [December 12, 2025, 11:26am UTC](https://forum.scylladb.com/t/stuck-topology-request-after-increasing-replication-factor/5202 "2025-12-12T11:26:53Z")
Installation details #ScyllaDB version: 6.2 #Cluster size: 30 nodes x 1 dc #OS: Ubuntu 24.04 Hey everybody, I encounter some issues with a stuck topology request after increasing the replication factor. The query wh… --- ## [Error on repair, malformed sstable exception, after topology change](https://forum.scylladb.com/t/error-on-repair-malformed-sstable-exception-after-topology-change/5176)
**Author:** [@Guy](https://forum.scylladb.com/u/Guy)\ **Replies:** 0\ **Last updated:** [November 11, 2025, 9:32am UTC](https://forum.scylladb.com/t/error-on-repair-malformed-sstable-exception-after-topology-change/5176 "2025-11-11T09:32:24Z")
--- ## [How do I change the replication factor from 3 to 2 in a running cluster? Should I move nodes between racks?](https://forum.scylladb.com/t/how-do-i-change-the-replication-factor-from-3-to-2-in-a-running-cluster-should-i-move-nodes-between-racks/5151)
**Author:** [@Guy](https://forum.scylladb.com/u/Guy)\ **Replies:** 0\ **Last updated:** [October 23, 2025, 7:44am UTC](https://forum.scylladb.com/t/how-do-i-change-the-replication-factor-from-3-to-2-in-a-running-cluster-should-i-move-nodes-between-racks/5151 "2025-10-23T07:44:51Z")
--- ## [Need to move a large cluster from 1 rack to 3 racks](https://forum.scylladb.com/t/need-to-move-a-large-cluster-from-1-rack-to-3-racks/4833)
**Author:** [@choubacha](https://forum.scylladb.com/u/choubacha)\ **Replies:** 2\ **Last updated:** [May 19, 2025, 8:58pm UTC](https://forum.scylladb.com/t/need-to-move-a-large-cluster-from-1-rack-to-3-racks/4833 "2025-05-19T20:58:12Z")
Installation details #ScyllaDB version: 5.4 #Cluster size: 18 nodes w/ ~4 TiB used. os (RHEL/CentOS/Ubuntu/AWS AMI): Ubuntu We are currently using scylla operator with kube and have built out a large cluster in a si… --- ## [What's the best way to split a cluster that's on two data centers into two clusters?](https://forum.scylladb.com/t/whats-the-best-way-to-split-a-cluster-thats-on-two-data-centers-into-two-clusters/4570)
**Author:** [@Guy](https://forum.scylladb.com/u/Guy)\ **Replies:** 0\ **Last updated:** [March 5, 2025, 4:51am UTC](https://forum.scylladb.com/t/whats-the-best-way-to-split-a-cluster-thats-on-two-data-centers-into-two-clusters/4570 "2025-03-05T04:51:04Z")
--- ## [Node crashing after adding new nodes in scylla cluster](https://forum.scylladb.com/t/node-crashing-after-adding-new-nodes-in-scylla-cluster/3036)
**Author:** [@Chaitanya](https://forum.scylladb.com/u/Chaitanya)\ **Replies:** 3\ **Last updated:** [December 27, 2024, 9:28am UTC](https://forum.scylladb.com/t/node-crashing-after-adding-new-nodes-in-scylla-cluster/3036 "2024-12-27T09:28:21Z")
Hello Team, We are facing issue of old nodes getting crashed after adding new nodes. Details : Scylla version : 6.1.2-0.20240915.b60f9ef4c223 Backup restoration performed on 4 node scylla cluster running on 6.1. So… --- ## [Can you change the topology with down nodes](https://forum.scylladb.com/t/can-you-change-the-topology-with-down-nodes/2964)
**Author:** [@Meagan\_Kellner](https://forum.scylladb.com/u/Meagan_Kellner)\ **Replies:** 1\ **Last updated:** [September 29, 2024, 12:51pm UTC](https://forum.scylladb.com/t/can-you-change-the-topology-with-down-nodes/2964 "2024-09-29T12:51:44Z")
The recommendation is to not make schema changes. We are looking at having to make schema changes, but have 3 nodes with an inability to come back into the cluster. We do have quorum. What are the real risks to making to…