Re: Migration Cassandra to a new data center

2024-11-05 Thread Bowen Song via user
Hinted hand off is a best effort approach, and relying on it alone is a bad idea. Hints can get lost due to a number of reasons, such as getting too old or too big, or the node storing the hints dies. You should rely on regular repair to guarantee the correctness of the data. You may use hinted

Re: Migration Cassandra to a new data center

2024-11-05 Thread edi mari
Thank you for your reply, Bowen. Correct, the questions were about migrating the server hardware to a new location, not the Cassandra DC. Wouldn’t it be a good idea to use the hints to complete the data to DC3? I'll extend the hint window (e.g., to one week) and allow the other data centers (DC1 a

Re: Migration Cassandra to a new data center

2024-11-05 Thread Bowen Song via user
You just confirmed my suspicion. You are indeed referring to both physical location of servers and the logical Cassandra DC with the same term here. The questions are related to the procedure of migrating the server hardware to a new location, not the Cassandra DC. Assuming that the IP addre

Re: Migration Cassandra to a new data center

2024-11-05 Thread edi mari
Each physical data center corresponds to a "logical" Cassandra DC (a group of nodes). In our situation, we need to move one of our physical data centers (i.e., the server rooms) to a new location, which will involve an extended period of downtime. Thanks Edi On Tue, Nov 5, 2024 at 1:27 PM Bowen S

Re: Migration Cassandra to a new data center

2024-11-05 Thread Bowen Song via user
From the way you wrote this, I suspect the name DC may have different meaning here. Are you talking about the physical location (i.e server rooms), or the Cassandra DC (i.e. group of nodes for replication purposes)? On 05/11/2024 11:01, edi mari wrote: Hello, We have a Cassandra cluster deploy

Migration Cassandra to a new data center

2024-11-05 Thread edi mari
Hello, We have a Cassandra cluster deployed across three different data centers, with each data center (DC1, DC2, and DC3) hosting 50 Cassandra nodes. We are currently saving one replica in each data center. We plan to migrate DC3, including storage and servers, to a new data center. 1. What woul