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What is the Difference between node unresponsive and node failover in Couchbase while I was monitoring my cluster I can see one node is in unresponsive state what is the exact difference between both

dnault
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Sirisha Dasari
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1 Answers1

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An "unresponsive" node is one that is not responding to requests. A node could be unresponsive because of a network or hardware problem, or an internal server error.

Failover is what you do to an unresponsive node to forcibly remove it from the cluster.

Further reading:

  • Remove a node and rebalance (a graceful way to remove a node that IS reponsive)
  • Fail a Node Over and Rebalance (a less graceful way that works with unresponsive nodes and can potentially result in loss of data that hasn't yet been replicated from the failed node)
  • Recovery (after you fail over a node, if it starts behaving again you can add it back into the cluster)
dnault
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  • Will the operations run if the node is in unresponsive state – Sirisha Dasari Nov 18 '21 at 14:58
  • @SirishaDasari Which operations are you asking about? – dnault Nov 18 '21 at 20:02
  • Can we retrieve the data if node is in unresponsive | not - taking traffic – Sirisha Dasari Nov 19 '21 at 14:22
  • @SirishaDasari There _might_ be some way to get data from the unresponsive node, but I don't know. In general, the way to handle this kind of issue is to configure the Couchbase bucket to have 1 or more replicas. Then if a node fails, the data is still available on other nodes. That's something you do *before* a failure happens, though. If your problem is that you have a failed node and no replicas, and you need to get the data off the node, the experts on the [Couchbase Forum](https://forums.couchbase.com) might be able to suggest some things to try. – dnault Nov 19 '21 at 18:16