3:55 a.m.
Michal Karm Babacek created MODCLUSTER-565:
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Summary: Expand mod_cluster manager console to output JSON data about worker
nodes
Key: MODCLUSTER-565
URL: https://issues.jboss.org/browse/MODCLUSTER-565
Project: mod_cluster
Issue Type: Feature Request
Components: Native (httpd modules)
Affects Versions: 2.0.0.Alpha1
Reporter: Michal Karm Babacek
Assignee: Michal Karm Babacek
mod_proxy_cluster needs a module that would provide a comprehensive command & control
visualization of events going on within the balancer and with worker nodes. The
visualization would also serve as a demonstration for presentation purposes (to replace
current SWING app from ~2009-ish).
The new module would most likely work with https://d3js.org/ and generate an SVG/JS page
on a new added httpd handler. For this new module to work, we need JSON data from
mod_cluster manager (currently spits out only HTML/text/XML).
h3. Task one: mod_cluster manager JSON data
[~bsikora] researched suitable JavaScript libraries and he would like to have the JSON
output resemble the following:
{quote}
I find the Wildfly style of Undertow mod_cluster proxy filter CLI output the most
suitable:
{code}
"balancer" => {"mycluster" => {
"max-attempts" => 1,
"sticky-session" => true,
"sticky-session-cookie" => "JSESSIONID",
"sticky-session-force" => false,
"sticky-session-path" => undefined,
"sticky-session-remove" => false,
"wait-worker" => 0,
"load-balancing-group" => undefined,
"node" => {
"jboss-eap-7.1-1" => {
"aliases" => [
"default-host",
"localhost"
],
"cache-connections" => 40,
"elected" => 0,
"flush-packets" => false,
"load" => 0,
"load-balancing-group" => undefined,
"max-connections" => 40,
"open-connections" => 0,
"ping" => 10,
"queue-new-requests" => true,
"read" => 0L,
"request-queue-size" => 1000,
"status" => "NODE_HOT_STANDBY",
"timeout" => 0,
"ttl" => 60L,
"uri" => "ajp://192.168.122.88:8009/?#",
"written" => 0L,
"context" => {"/clusterbench" => {
"requests" => 0,
"status" => "enabled"
}}
},
{code}
So, the JSON for my JavaScript renderer could look like:
{code}
{
"balancers": [{
"name": "mycluster",
"max-attempts": 1,
"sticky-session": true,
"sticky-session-cookie": "JSESSIONID",
"sticky-session-force": false,
"sticky-session-remove": false,
"wait-worker": 0,
"workers": [
{
"name": "jboss-eap-7.1-1",
"aliases": ["default-host", "localhost"],
"cache-connections": 40,
"elected": 0,
"flush-packets": false,
"load": 0,
"requests": 350
}, {
"name": "jboss-eap-7.1-2",
"aliases": ["default-host", "localhost"],
"cache-connections": 40,
"elected": 0,
"flush-packets": false,
"load": 0,
"requests": 350
}
]
}]
}
{code}
{quote}
h3. Task two: mod_cluster gui console
Write a separate module that could be optionally loaded alongside with mod_manager to
provide the gui JavaScript/SVG gui console and/or consider deploying the console as a web
page into the httpd's web serving directory.
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