Couchbase

Overview
Reference
- internalSettings
Terminology
Topics
- Document Expiration
How-to
- Failover
- Reset couchbase password
Links

Overview

Reference

internalSettings

$ curl -u Administrator:password -v http://localhost:8091/internalSettings
{
  "indexAwareRebalanceDisabled": false,
  "rebalanceIndexWaitingDisabled": false,
  "rebalanceIndexPausingDisabled": false,
  "rebalanceIgnoreViewCompactions": false,
  "rebalanceMovesPerNode": 1,
  "rebalanceMovesBeforeCompaction": 64,
  "maxParallelIndexers": 4,
  "maxParallelReplicaIndexers": 2,
  "maxBucketCount": 10,
  "gotraceback": "crash",
  "indexAutoFailoverDisabled": true,
  "certUseSha1": false
}

https://developer.couchbase.com/documentation/server/current/rest-api/rest-get-internal-setting.html

Terminology

Node: A single Couchbase Server instance
Cluster: A collection of nodes that are accessed and managed as a single group.
Bucket: A logical container for a related set of items
Item: The basic unit of data such as JSON documents
vBucket: Physical partitions of the bucket data.
Cluster map: A mapping of which services belong to which nodes at a given point in time.
vBucket map: A mapping of vBuckets to nodes at a given point in time.
Replication: The process of creating additional copies of active data on alternate nodes.
Rebalance: Used to redistribute the load and adapt to the new topology of nodes.
Failover: To divert traffic away from failing nodes to the remaining healthy nodes.
Node lifecycle

https://developer.couchbase.com/documentation/server/4.6/architecture/terminology.html

Topics

Document Expiration

TTL in seconds if it's 30 days or less
TTL in Unix time if it's over 30 days
Couchbase runs a process named expiry pager periodically to clean up expired items
Expire pager runs every 60 minutes by default(can be configured through exp_pagerstime)