Cluster browser

The CrateDB admin UI comes with a cluster browser that allows you to inspect all of the nodes that are in your cluster.

Table of contents

Screenshot

Here’s what a single node cluster looks like:

_images/cluster-simple.png

In this example, there is one node named Monte Civetta. When selected from the left-hand sub-navigation menu, information about a node is displayed.

Features

The cluster browser features:

Node listing:The list of nodes gives basic summary information for each node: node name, hostname, CrateDB version, and a visual icon indicating whether the node is a master node or not and the node data status health check.
Node list ordering:The list of nodes can be ordered by name or node health.
Detailed node information:Selecting a node from the node list will display details about that particular node.

The following subsections explain the detailed node information.

Overview

Name:

The name of the node.

CrateDB automatically names unnamed nodes.

Hostname:

The hostname of the node.

CrateDB Version:

The version of CrateDB the node is running.

This is important information when performing a rolling upgrade.

REST URL:

The URL of the node’s HTTP endpoint.

CPU Usage:

A visual indicator of system CPU utilization.

Heap Usage:

A visual indicator of allocated Java Virtual Machine (JVM) heap utilization.

Disk Usage:

A visual indicator of system disk space utilization.

CrateDB CPU Usage:

A visual indicator of the CrateDB process CPU utilization.

Load

1min:Average load over one minute.
5min:Average load over five minutes.
15min:Average load over fifteen minutes.

CPU cores

Cores:The number of CPU cores.

Shards

Initializing:The number of shards currently being initialized.
Started:The number of started shards.
Reallocating:The number of shards that are being moved to another node.
Post Recovery:The number of shards that have been recovered but have not yet been started.

Disk operations

Read:

Total size of reads on the disk in bytes.

This value is deprecated.

Write:

Total size of writes on the disk in bytes.

This value is deprecated.

Reads:

Number of reads on the disk.

Writes:

Number of writes on the disk.