You can check the status of the engine by issuing an HTTP GET request on one of the following URLs:
-
Qlik Sense Enterprise: https://server.domain.com/engine/healthcheck/ (where server.domain.com is the computer where the QPS is installed)
-
Qlik Sense Desktop: http://localhost:4848/engine/healthcheck/
In Qlik Sense Enterprise, the health check request is called via the Qlik Sense Proxy Service, which routes the request to the engine on the same physical computer. To request the health check information for a different node, use that node's IP address with the engine port (4747 by default). For example:
https://<ip-address>:4747/healthcheck
Statistics returned by health check
The JSON response from the health check request contains the following information about the engine:
| Field | Description |
|---|---|
| version | Engine version. |
| started | ISO timestamp when the engine service was started. |
| Field | Description |
|---|---|
| committed | The total amount of committed memory for the engine process in MB. |
| allocated | The total amount of allocated memory (committed + reserved) from the operating system in MB. |
| free | The total amount of free memory (minimum of free virtual and physical memory) in MB. |
| Field | Description |
|---|---|
| total | Percentage of the CPU used by the engine, averaged over a time period of 30 seconds. |
| Field | Description |
|---|---|
| active | Number of active engine sessions. A session is active when a user is currently performing some action on an app, for example, making selections or creating content. |
| total | Total number of engine sessions. |
| Field | Description |
|---|---|
| active_docs | An array of either the GUIDs (Qlik Sense Enterprise) or names (Qlik Sense Desktop) of active apps. Empty if no apps are active. An app is active when a user is currently performing some action on it. |
| in_memory_docs | An array of either the GUIDs (Qlik Sense Enterprise) or names (Qlik Sense Desktop) of all apps currently loaded into the memory, even if they do not have any open sessions or connections to it. The apps disappear from the list when the engine has purged them out from memory. |
| loaded_docs | An array of either the GUIDs (Qlik Sense Enterprise) or names (Qlik Sense Desktop) of apps currently loaded into memory and that have open sessions or connections. Empty if no apps are loaded. |
| calls | Total number of requests made to the engine. |
| selections | Total number of selections made to the engine. |
| Field | Description |
|---|---|
| active | Number of distinct active users. An active user is one who is currently performing an action on an app. |
| total | Total number of distinct users within the current engine sessions. |
| Field | Description |
|---|---|
| hits | Number of cache hits. |
| lookups | Number of cache lookups. |
| added | Number of cache objects added. |
| replaced | Number of cache objects replaced. |
| bytes_added | Size in bytes of cache objects added. |
| saturated | When the value is true, the engine is running with high resource usage; otherwise the value is false. High resource usage occurs when one of the following conditions is met:
|
Response examples
The JSON response for Qlik Sense Enterprise with two loaded and two active apps looks something like the following:
{
"version": "12.9.0",
"started": "20170301T111505.000-0500",
"mem": {
"committed": 56.84765625,
"allocated": 181.06640625,
"free": 8684.48046875
},
"cpu": {
"total": 0
},
"session": {
"active": 2,
"total": 2
},
"apps": {
"active_docs": ["4e19dc36-2020-4435-bb96-fe3c613207c7",
"f6de0244-911b-4c31-8f4d-0e5fcd8bf57a"],
"loaded_docs": ["4e19dc36-2020-4435-bb96-fe3c613207c7",
"f6de0244-911b-4c31-8f4d-0e5fcd8bf57a"],
"calls": 60,
"selections": 0
},
"users": {
"active": 1,
"total": 1
},
"cache": {
"hits": 26,
"lookups": 35,
"added": 9,
"replaced": 0,
"bytes_added": 11520
},
"saturated": false
}
The JSON response for Qlik Sense Enterprise with no loaded apps looks something like the following:
{
"version": "12.9.0",
"started": "20170301T111505.000-0500",
"mem": {
"committed": 116.421875,
"allocated": 296.05859375,
"free": 8246.60546875
},
"cpu": {
"total": 0
},
"session": {
"active": 0,
"total": 0
},
"apps": {
"active_docs": [],
"loaded_docs": [],
"calls": 78,
"selections": 0
},
"users": {
"active": 0,
"total": 0
},
"cache": {
"hits": 4668,
"lookups": 5087,
"added": 413,
"replaced": 6,
"bytes_added": 1496192
},
"saturated": false
}
The JSON response for Qlik Sense Desktop with two loaded apps and one active app looks something like the following:
{
"version": "12.9.0",
"started": "20170301T112440.000-0500",
"mem": {
"committed": 155.23828125,
"allocated": 289.328125,
"free": 7814.75
},
"cpu": {
"total": 0
},
"session": {
"active": 1,
"total": 2
},
"apps": {
"active_docs": ["C:/Users/myuser/Documents/Qlik/Sense/Apps/Sales Discovery.qvf"],
"loaded_docs": ["C:/Users/myuser/Documents/Qlik/Sense/Apps/Consumer Sales.qvf",
"C:/Users/myuser/Documents/Qlik/Sense/Apps/Sales Discovery.qvf"],
"calls": 93,
"selections": 0
},
"users": {
"active": 1,
"total": 1
},
"cache": {
"hits": 528,
"lookups": 750,
"added": 377,
"replaced": 170,
"bytes_added": 658624
},
"saturated": false
}
The JSON response for Qlik Sense Desktop with no loaded apps looks something like the following:
{
"version": "12.9.0",
"started": "20170301T112440.000-0500",
"mem": {
"committed": 155.26953125,
"allocated": 290.328125,
"free": 7928.23828125
},
"cpu": {
"total": 0
},
"session": {
"active": 0,
"total": 0
},
"apps": {
"active_docs": [],
"loaded_docs": [],
"calls": 94,
"selections": 0
},
"users": {
"active": 0,
"total": 0
},
"cache": {
"hits": 0,
"lookups": 0,
"added": 0,
"replaced": 0,
"bytes_added": 0
},
"saturated": false
}