CODEWITHSUNDEEP
couchbasedurability
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Reputation: 4151

Couchbase high durability

I want to design a banking system using couchbase , and I need high durability (like RDBMS) , How can I achieve 100% durability and not bit of data loss?

enter image description here

I know I can use persist_to and replicate_to for durability

bucket.insert(id, data, { "persist_to": 3}, (error, result) => {
    if(error) {
        throw error;
    }
    console.log(result);
});

1- If I have 6 servers and I choose persist_to=3 , How can I ensure that the data is durable , for instance If the active node is server1 and my data is persisted to server1, server2 and server3 , and we have a fail on server1 , What if server4 -that has no data in memory or disk- become active?

2- How can I detect from SDK the size of cluster dynamically?And set persist_to to majority (numberOfNodes/2+1)

Upvotes: 4

Views: 101

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