Diagnosing and preventing Network Problems with Health Check

In today’s distributed and virtual environments, users will often not have full administrative control over their whole network. Health Check introduces various diagnostics tools to request information regarding the state of the underlying connections from the SDK, giving instant health check information.

Diagnosing problems in distributed environments is far from easy, so Couchbase provides a Health Check API with Diagnostics() for a look at what the client believes is the current state of the SDKs connection to the cluster. More extensive discussion of the uses of Health Check can be found in the Health Check Concept Guide.

Diagnostics

Diagnostics returns a list of the nodes that the SDK currently has (or had) a connection to, and the current status of the connection. This call does not actively poll the nodes, reporting instead the state the last time it tried to access each node.

var report = await bucket.diagnostics()
/*
{
    "id":"0x10290d100","kv":[
        {
            "id":"0000000072b21d66",
            "last_activity_us":2363294,
            "local":"10.112.195.1:51473",
            "remote":"10.112.195.101:11210",
            "status":"connected"
        },
        {
            "id":"000000000ba84e5e",
            "last_activity_us":7369021,
            "local":"10.112.195.1:51486",
            "remote":"10.112.195.102:11210",
            "status":"connected"
        },
        {
            "id":"0000000077689398",
            "last_activity_us":4855640,
            "local":"10.112.195.1:51409",
            "remote":"10.112.195.103:11210",
            "status":"connected"
        }
    ],
    "sdk":"libcouchbase/2.9.5-njs couchnode/2.6.9 (node/10.16.0; v8/6.8.275.32-node.52; ssl/1.1.1b)",
    "version":1
}
*/