hface

Hazelcast cluster monitoring and debugging dashboard

• What do you mean?
• The Gist
• Visual
  • ASCII
• Run it
  • hface config
  • from releases
  • from sources
  • for pre Hazelcast 4.0
• License

What do you mean?

The Gist

hface monitors a Hazelcast cluster in real time. It currently supports maps, multimaps and queues. Support for other distributed data structures is coming.

In order to monitor a remote Hazelcast cluster add an 8K jar dependency to it:

[org.hface/hface-client "0.1.8"]

or

<dependency>
  <groupId>org.hface</groupId>
  <artifactId>hface-client</artifactId>
  <version>0.1.8</version>
</dependency>

it will be collecting the stats from all the nodes and will be sending these stats to hface for aggregation and visual pleasure. Here is an example of a simple Hazelcast server node with an hface client dependency.

Visual

This is what hface dash currently looks like as it monitors the cluster:

ASCII

All the stats are also available in JSON via /stats:

Run it

for pre Hazelcast 4.0+ clusters: hface config and deps are different and to run it follow this

hface config

hface dashboard relies on a small configuraion file that can be pointed to by -Dconf=path-to-config. Here is a sample config:

{:collector {:refresh-interval 4}     ;; refresh cluster stats every 4 seconds
 :hz-client {:hosts ["127.0.0.1"]     ;; hazelcast cluster hosts/ips
             :cluster-name "dev"}}    ;; cluster name to connect to

from releases

download the hface release from releases i.e. let's say the version is 0.1.1:

$ wget https://github.com/tolitius/hface/releases/download/v0.1.1/hface-dash-0.1.1.jar

run it:

$ java -jar -Dconf=/opt/app/hface/hface.conf hface-dash-0.1.1.jar

then, for joy, go to http://localhost:3000/

/opt/app/hface/hface.conf is a sample path to the config file, replace it with your path

from sources

get ready

you would need lein (if you come from Java think maven) to compile and build a single runnable jar, a.k.a. an uberjar.

lein is straighforward to install: just download the script and run it

build and run

• clone the repo (e.g. git clone https://github.com/tolitius/hface.git)
• cd hface/dash
• lein ring uberjar
• java -jar -Dconf=/path-to/hface.conf target/hface-dash.jar

then, for joy, go to http://localhost:3000/

lein version

starting from 2.9.0+ lein brings newer deps that break backwards compatibility as discussed in this and this issues. If you experience a problem building hface from sources:

$ lein downgrade 2.8.3
$ lein do clean, ring uberjar

which will work, and then:

$ lein upgrade

to bring you back to the latest lein version.

for pre Hazelcast 4.0

In case you are working with a Hazelcast 3.x.x clusters:

hface client

bring 0.1.6 hface client instead of the latest:

[org.hface/hface-client "0.1.6"]

hface config

hface dashboard relies on a small configuraion file that can be pointed to by -Dconf=path-to-config. Here is a sample config:

{:collector {:refresh-interval 4}                       ;; refresh cluster stats every 4 seconds
 :hz-client {:hosts ["127.0.0.1" "127.0.0.2"]           ;; hazelcast cluster hosts/ips
             :retry-ms 5000                             ;; retry to reconnect in 5 seconds
             :retry-max 720000                          ;; 720000 * 5000 = one hour
             :group-name "dev"                          ;; creds to the cluster (dev/dev-pass are hz defaults)
             :group-password "dev-pass"}}

from releases

download the hface 0.1.0 release from releases:

$ wget https://github.com/tolitius/hface/releases/download/v0.1.0/hface-dash-0.1.0.jar

run it:

$ java -jar -Dconf=/opt/app/hface/hface.conf hface-dash-0.1.0.jar

then, for joy, go to http://localhost:3000/

/opt/app/hface/hface.conf is a sample path to the config file, replace it with your path

License

Copyright © 2020 tolitius

Distributed under the Eclipse Public License, the same as Clojure.