英文:
Couchbase View Consistency
问题
以下代码确保任何给定的文档将以持久的方式保存到Couchbase集群中的活动节点，并复制到1个附加节点：
cas, err := myBucket.UpsertDura(docToStore, valueToStore, 1, 1)
考虑到Couchbase视图是最终一致性的，似乎在写入文档后保证调用视图时有两个选项（确保文档出现在视图中）：
选项1
将上述代码中的replicateTo值更改为等于集群中附加节点的总数（减去活动节点），确保每个节点都包含文档的副本：
cas, err := myBucket.UpsertDura(docToStore, valueToStore, 3, 4)
选项2
使用标准的Upsert函数保存文档，但在调用视图时将stale-mode设置为after-update
_, err := bucket.Upsert(myID, &myDoc, 0)
vq := gocb.NewViewQuery("doc", "view").Stale(gocb.StaleMode(1))
err = bucket.ExecuteViewQuery(vq)
是否有其他方法以最高效的方式实现这一目标？基本上，我希望在保存后立即在所有相关视图中显示文档。
英文:
The following code guarantees that any given document will be saved in a durable manner to the active node in a Couchbase cluster, as well as replicated to 1 additional node:
cas, err := myBucket.UpsertDura(docToStore, valueToStore, 1, 1)
Given that Couchbase Views are eventually consistent, it would seem that I have 2 options in terms of guaranteeing consistency when invoking a view after writing a document (ensuring that the document appears in the view):
Option 1
Change the replicateTo value in the above code to equal the total number of additional nodes (minus the active node) in the cluster, ensuring that each node contains a copy of the document:
cas, err := myBucket.UpsertDura(docToStore, valueToStore, 3, 4)
Option 2
Use the standard Upsert function to save the document, but invoke the View with stale-mode set to after-update
_, err := bucket.Upsert(myID, &myDoc, 0)
vq := gocb.NewViewQuery("doc", "view").Stale(gocb.StaleMode(1))
err = bucket.ExecuteViewQuery(vq)
Are there any alternatives to achieve this in the most performant manner possible? Essentially I would like for the document the appear in all relative views immediately after saving.
答案1
得分: 1
你需要将stale模式设置为false。如果设置为stale=ok，即使视图过期，Couchbase也不会刷新视图。这样做的好处是可以提高查询的延迟。如果设置为stale=update_after，Couchbase会在返回过期结果后更新视图。如果设置为stale=false，Couchbase会刷新视图并返回最新的结果。
英文:
you need to set the stale mode to false. If stale=ok is set, Couchbase will not refresh the view even if it is stale. The benefit of this is a an improved query latency. If stale=update_after is set, Couchbase will update the view after the stale result is returned. If stale=false is set, Couchbase will refresh the view and return you most updated results.
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