Details
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Type:
Improvement
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Status: Resolved
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Priority:
Normal
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Resolution: Done
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Affects Version/s: None
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Fix Version/s: None
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Component/s: None
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Labels:
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Template:customfield_10700 152199
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Team:Systems Engineering
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Story Points:2
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Sprint:SE 2016-11-16, SE 2016-11-30, SE 2017-01-11
Description
JMX supports retrieving several MBeans at once using globbing:
https://docs.oracle.com/javase/8/docs/api/javax/management/ObjectName.html
This would be especially useful for Puppet Server, which tracks metrics on a per-node basis:
metrics/v1/mbeans/*.compiler.compile.*.<some slow node>*
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Currently, one would have to hit the root metrics/v1/mbeans endpoint, pipe the results to a script that greps out the relevant mbeans and then pipe those results to a script that forms a compound request.
It would also be nice to return only a specific attribute from a MBean. For example, querying the GarbageCollector MBean returns a lot of data:
# curl -k 'https://127.0.0.1:8140/metrics/v1/mbeans/java.lang:type=GarbageCollector,name=PS+Scavenge'|python -m json.tool
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% Total % Received % Xferd Average Speed Time Time Time Current
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Dload Upload Total Spent Left Speed
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100 1723 100 1723 0 0 19571 0 --:--:-- --:--:-- --:--:-- 19804
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{
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"CollectionCount": 167,
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"CollectionTime": 2053,
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"LastGcInfo": {
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"GcThreadCount": 2,
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"duration": 6,
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"endTime": 2036911,
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"id": 167,
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"memoryUsageAfterGc": {
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"Code Cache": {
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"key": "Code Cache",
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"value": {
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"committed": 41943040,
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"init": 2555904,
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"max": 251658240,
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"used": 41526656
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}
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},
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"Compressed Class Space": {
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"key": "Compressed Class Space",
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"value": {
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"committed": 55296000,
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"init": 0,
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"max": 1073741824,
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"used": 26451312
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}
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},
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"Metaspace": {
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"key": "Metaspace",
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"value": {
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"committed": 185057280,
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"init": 0,
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"max": -1,
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"used": 111937088
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}
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},
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"PS Eden Space": {
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"key": "PS Eden Space",
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"value": {
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"committed": 51380224,
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"init": 34078720,
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"max": 55574528,
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"used": 0
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}
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},
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"PS Old Gen": {
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"key": "PS Old Gen",
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"value": {
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"committed": 179306496,
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"init": 89653248,
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"max": 179306496,
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"used": 149947456
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}
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},
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"PS Survivor Space": {
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"key": "PS Survivor Space",
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"value": {
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"committed": 17301504,
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"init": 5242880,
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"max": 17301504,
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"used": 1738920
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}
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}
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},
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"memoryUsageBeforeGc": {
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"Code Cache": {
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"key": "Code Cache",
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"value": {
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"committed": 41943040,
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"init": 2555904,
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"max": 251658240,
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"used": 41526656
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}
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},
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"Compressed Class Space": {
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"key": "Compressed Class Space",
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"value": {
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"committed": 55296000,
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"init": 0,
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"max": 1073741824,
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"used": 26451312
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}
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},
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"Metaspace": {
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"key": "Metaspace",
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"value": {
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"committed": 185057280,
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"init": 0,
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"max": -1,
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"used": 111937088
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}
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},
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"PS Eden Space": {
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"key": "PS Eden Space",
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"value": {
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"committed": 51380224,
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"init": 34078720,
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"max": 55574528,
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"used": 51380224
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}
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},
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"PS Old Gen": {
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"key": "PS Old Gen",
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"value": {
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"committed": 179306496,
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"init": 89653248,
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"max": 179306496,
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"used": 149947456
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}
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},
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"PS Survivor Space": {
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"key": "PS Survivor Space",
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"value": {
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"committed": 16252928,
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"init": 5242880,
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"max": 16252928,
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"used": 1474336
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}
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}
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},
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"startTime": 2036905
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},
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"MemoryPoolNames": "[Ljava.lang.String;@29028c4b",
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"Name": "PS Scavenge",
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"ObjectName": "java.lang:type=GarbageCollector,name=PS Scavenge",
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"Valid": true
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}
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It would be great to pull out a single attribute, such as the CollectionCount.
