Refactor state_* metricsets to share response from endpoint #25640

ChrsMark · 2021-05-10T14:26:30Z

What does this PR do?

This PR changes how kubernetes module handle state_* metricsets which share same target endpoint. The idea originates from https://github.com/elastic/beats/blob/master/x-pack/metricbeat/module/cloudfoundry/cloudfoundry.go

Note: At this point the PR stands more like a PoC with changes only applied at state_container and state_pod metricsets.

If we agree with this solution (and make sure that it would be applied with Agent too) we can extend it to the rest of state_* metricsets as well as to metricsets fetch from kubelet's endpoint (node, pod, container, volume, system)

In upcoming PR we will apply similar strategy for metricsets fetching from kubelet's endpoint (node, pod, container, volume, system)

Why is it important?

To improve the performance of the module by avoid fetching same content multiple times.

Checklist

My code follows the style guidelines of this project
I have commented my code, particularly in hard-to-understand areas
I have made corresponding changes to the documentation
I have made corresponding change to the default configuration files
I have added tests that prove my fix is effective or that my feature works
I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Author's Checklist

Does it have impact for Agent deployments too?
Verified with different module's config blocks. See step 4 of testing notes below.

How to test this PR locally

On a k8s cluster install kube_state_metrics (https://github.com/kubernetes/kube-state-metrics/tree/master/examples/standard)
Expose kube_state_metrics endpoint on the local machine -> kubectl -n kube-system port-forward svc/kube-state-metrics 8081:8080
Start capturing traffic on kube-state-metrics' endpoint -> tcpdump -i any -s 0 'tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x47455420'
Test with different module's config blocks (what Agent does):

- module: kubernetes
  metricsets:
    - state_pod
  period: 10s
  hosts: ["0.0.0.0:8081"]
  add_metadata: false

- module: kubernetes
metricsets:
- state_container
period: 10s
hosts: ["0.0.0.0:8081"]
add_metadata: false

Verify with tcpdump's output that only one request takes place no matter how many modules/metricsets are enabled.

Test one combined module block:

- module: kubernetes
  metricsets:
    - state_pod
    - state_container
  period: 10s
  hosts: ["0.0.0.0:8081"]
  add_metadata: false

Verify with tcpdump's output that only one request takes place no matter how many modules/metricsets are enabled.

Related issues

Relates Refactor kubernetes metricsets to use single calls per endpoint #24869

Signed-off-by: chrismark <chrismarkou92@gmail.com>

elasticmachine · 2021-05-10T14:26:32Z

Pinging @elastic/integrations (Team:Integrations)

ChrsMark · 2021-05-10T14:38:12Z

@exekias, @jsoriano I would love your feedback on this. @kaiyan-sheng might be interested into this too since sth similar could be applied on AWS related stuff too.

I still need to verify if this change will have impact on Agent's deployments too since I'm not sure if Agent spawns metricsets directly per data_stream. If that's the case then this change will only have impact for Beats' deployments.

elasticmachine · 2021-05-10T14:43:29Z

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Start Time: 2021-05-18T10:46:36.269+0000
Duration: 116 min 51 sec
Commit: 6a4b0e7

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exekias

Left some comments.

This approach could work, I wonder if it will make things too complex? I wonder if it would make sense to put everything together in the same metricset, did you consider that option?

exekias · 2021-05-11T13:30:50Z

metricbeat/module/kubernetes/kubernetes.go

+	if m.prometheus == nil {
+		m.prometheus = prometheus
+	}
+	go m.runStateMetricsFetcher(period)


There is a race condition here. If this function is called by two metricsets at the same time you could end up with several fetchers running.

Also, what if different metricsets have a different period?

Also, what if different metricsets have a different period?

Period is defined at the module level, so all metricsets will have the same period.

Both cases should be handled by https://github.com/elastic/beats/pull/25640/files#diff-9933f42aec81125910c9923f83fa89c9a76918aac6e3bd5a68c430aeeab91084R98-R106.

Taking into consideration that period is set on Module's level then I think that different period's check is redundant. Metricsets will not share the input if they are configured in different Modules like:

- module: kubernetes metricsets: - state_pod - module: kubernetes metricsets: - state_container

So the period adjustment at https://github.com/elastic/beats/pull/25640/files#diff-9933f42aec81125910c9923f83fa89c9a76918aac6e3bd5a68c430aeeab91084R100 could be removed.

- module: kubernetes metricsets: - state_pod - module: kubernetes metricsets: - state_container

Take into account that this configuration will instantiate two different modules, and they won't reuse the shared families. If we want/need to supports configs like these ones, this approach won't work. To reuse the families we would need one of:

A global cache, indexed by the endpoints used.

Merge everything in a single metricset, but this has other challenges as mentioned in Refactor state_* metricsets to share response from endpoint #25640 (comment)

Can you investigate what Agent is doing with a config like that? I think doing this at the module level is good enough if the Agent handles it correctly, and removes the complexity of indexing by endpoint, metrics path and other parameters (including the security part).

ChrsMark · 2021-05-11T13:55:45Z

Left some comments.

This approach could work, I wonder if it will make things too complex? I wonder if it would make sense to put everything together in the same metricset, did you consider that option?

It had been discussed and rejected in the past like at #12938 and recently we also end up with keeping as is and coming with this improvement.

jsoriano

Added some suggestions that could simplify things.

jsoriano · 2021-05-11T13:45:29Z

metricbeat/module/kubernetes/kubernetes.go

+	if m.prometheus == nil {
+		m.prometheus = prometheus
+	}
+	go m.runStateMetricsFetcher(period)


Also, what if different metricsets have a different period?

Period is defined at the module level, so all metricsets will have the same period.

metricbeat/module/kubernetes/kubernetes.go

metricbeat/helper/prometheus/prometheus.go

Signed-off-by: chrismark <chrismarkou92@gmail.com>

jsoriano

LGTM for beats, we will have to check if this solves the issue in Agent (#25640 (comment)). Added only a small suggestion.

metricbeat/module/kubernetes/kubernetes.go

Signed-off-by: chrismark <chrismarkou92@gmail.com>

metricbeat/module/kubernetes/kubernetes.go

Signed-off-by: chrismark <chrismarkou92@gmail.com>

ChrsMark · 2021-05-14T15:19:17Z

Tested that with Agent and figured out that metircsets are spawned under different Module objects so I changed the implementation to use global cache on Module's level shared across all Module's instances.

Did some manual tests and it seems from the logs that context is reused. I will test it more.

Agent's standalone config:

id: 322f76f0-b3eb-11eb-9eaa-250cd6228ac5
revision: 2
outputs:
  default:
    type: elasticsearch
    hosts:
      - 'http://elasticsearch:9200'
    username: elastic
    password: changeme
output_permissions:
  default:
    _fallback:
      cluster:
        - monitor
      indices:
        - names:
            - logs-*
            - metrics-*
            - traces-*
            - .logs-endpoint.diagnostic.collection-*
            - synthetics-*
          privileges:
            - auto_configure
            - create_doc
agent:
  monitoring:
    enabled: false
    logs: false
    metrics: false
inputs:
  - id: 403033a2-494d-43a7-9802-8435b9d17ca4
    name: kubernetes-1
    revision: 1
    type: kubernetes/metrics
    use_output: default
    meta:
      package:
        name: kubernetes
        version: 0.5.1
    data_stream:
      namespace: default3
    streams:
      - id: >-
          kubernetes/metrics-kubernetes.state_container-403033a2-494d-43a7-9802-8435b9d17ca4
        data_stream:
          dataset: kubernetes.state_container
          type: metrics
        metricsets:
          - state_container
        add_metadata: true
        hosts:
          - '0.0.0.0:8081'
        period: 10s
      - id: >-
          kubernetes/metrics-kubernetes.state_pod-403033a2-494d-43a7-9802-8435b9d17ca4
        data_stream:
          dataset: kubernetes.state_pod
          type: metrics
        metricsets:
          - state_pod
        add_metadata: true
        hosts:
          - '0.0.0.0:8081'
        period: 10s

Some sample Debug logs:

{"log.level":"warn","@timestamp":"2021-05-14T18:11:25.406+0300","log.logger":"debug(10s[0.0.0.0:8081])","log.origin":{"file.name":"kubernetes/kubernetes.go","file.line":86},"message":"DIFF: state_container != state_pod","ecs.version":"1.6.0"}
{"log.level":"warn","@timestamp":"2021-05-14T18:11:25.406+0300","log.logger":"debug(10s[0.0.0.0:8081])","log.origin":{"file.name":"kubernetes/kubernetes.go","file.line":90},"message":"FETCH families for ms: state_container. Last setter was state_pod","ecs.version":"1.6.0"}
{"log.level":"warn","@timestamp":"2021-05-14T18:11:25.406+0300","log.logger":"debug(10s[0.0.0.0:8081])","log.origin":{"file.name":"kubernetes/kubernetes.go","file.line":90},"message":"FETCH families for ms: state_container. Last setter was state_pod","ecs.version":"1.6.0"}
{"log.level":"warn","@timestamp":"2021-05-14T18:11:35.404+0300","log.logger":"debug (10s[0.0.0.0:8081])","log.origin":{"file.name":"kubernetes/kubernetes.go","file.line":86},"message":"DIFF: state_pod != state_container","ecs.version":"1.6.0"}
{"log.level":"warn","@timestamp":"2021-05-14T18:11:35.404+0300","log.logger":"debug (10s[0.0.0.0:8081])","log.origin":{"file.name":"kubernetes/kubernetes.go","file.line":95},"message":"REUSE families for ms: state_pod. Last setter was state_container","ecs.version":"1.6.0"}
{"log.level":"warn","@timestamp":"2021-05-14T18:11:35.404+0300","log.logger":"debug (10s[0.0.0.0:8081])","log.origin":{"file.name":"kubernetes/kubernetes.go","file.line":95},"message":"REUSE families for ms: state_container. Last setter was state_container","ecs.version":"1.6.0"}

metricbeat/module/kubernetes/kubernetes.go

jsoriano · 2021-05-17T09:23:36Z

metricbeat/module/kubernetes/kubernetes.go

+	defer m.lock.Unlock()
+
+	now := time.Now()
+	hash := fmt.Sprintf("%s%s", m.BaseModule.Config().Period, m.BaseModule.Config().Hosts)


Please use a common function to generate the hash, this hash is being calculated also in the function returned by ModuleBuilder().

And/or consider doing the initialization of m.fCache[hash] here so it is not needed to calculate the hash when initializing the module.

jsoriano · 2021-05-17T09:25:25Z

metricbeat/module/kubernetes/kubernetes.go

+	m.lock.Lock()
+	defer m.lock.Unlock()


This lock is in the module, but the cache is shared between all modules. The cache should have its own lock, and be the same for all modules/metricsets using it.

Nice catch thanks!

jsoriano · 2021-05-17T09:26:07Z

metricbeat/module/kubernetes/kubernetes.go

+		fCache.lastFetchTimestamp = now
+		fCache.setter = ms
+	} else {
+		m.logger.Warn("REUSE families for ms: ", ms, ". Last setter was ", fCache.setter)


Yeap I will remove them completely.

jsoriano · 2021-05-17T09:53:43Z

metricbeat/module/kubernetes/kubernetes.go

+	if ms != fCache.setter {
+		m.logger.Warn("DIFF[ms!=cacheSetter]: ", ms, " != ", fCache.setter)
+	}


Is this only to report that the metricset getting the families is different to the metricset that stored it? Not sure if needed, in any case log it at the debug level.

It will be removed.

jsoriano · 2021-05-17T09:54:12Z

metricbeat/module/kubernetes/state_container/state_container.go

 }

 // New create a new instance of the MetricSet
-// Part of new is also setting up the configuration by processing additional
+// Part of newF is also setting up the configuration by processing additional


Typo?

Suggested change

// Part of newF is also setting up the configuration by processing additional

// Part of new is also setting up the configuration by processing additional

jsoriano · 2021-05-17T09:57:09Z

metricbeat/module/kubernetes/kubernetes.go

+	sharedFamiliesCache := make(cacheMap)
+	return func(base mb.BaseModule) (mb.Module, error) {
+		hash := fmt.Sprintf("%s%s", base.Config().Period, base.Config().Hosts)
+		sharedFamiliesCache[hash] = &familiesCache{}


These entries will be never removed, this can be a leak if metricbeat is used to monitor clusters dynamically created. I guess this is only a corner case, we can leave this by now.

I will leave a comment about this in the code so as to have a good pointer if an issue arise in the future. One thing we could do (on top of my head suggestion follows) to tackle this could be to have a method on module level to figure out what entries to remove, which method will be called from Metricset's Close().

jsoriano · 2021-05-17T09:58:13Z

metricbeat/module/kubernetes/kubernetes.go

+	defer m.lock.Unlock()
+
+	now := time.Now()
+	hash := fmt.Sprintf("%s%s", m.BaseModule.Config().Period, m.BaseModule.Config().Hosts)


I don't think the period needs to be part of the hash key, it is ok if metricsets with the same hosts but different period share the families.

I agree, I will remove it.

Signed-off-by: chrismark <chrismarkou92@gmail.com>

mergify · 2021-05-17T11:52:30Z

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b refactor_state_metrics upstream/refactor_state_metrics
git merge upstream/master
git push upstream refactor_state_metrics

Signed-off-by: chrismark <chrismarkou92@gmail.com>

…trics

jsoriano · 2021-05-18T06:46:14Z

metricbeat/module/kubernetes/kubernetes.go

+		// NOTE: These entries will be never removed, this can be a leak if
+		// metricbeat is used to monitor clusters dynamically created.
+		// (https://github.com/elastic/beats/pull/25640#discussion_r633395213)
+		sharedFamiliesCache[hash] = &familiesCache{}


This map is being written every time a module is created. As it is now, I see two possible problems:

There can be race conditions (and panics) if several metricsets are created at the same time (not sure if possible), or if a metricset calls GetSharedFamilies while other metricset with the same hosts is being created (I guess this can happen with bad luck and/or with a low metricbeat.max_start_delay).

If a metricset is created after another one has already filled the cache, the cache will be reset, not a big problem, but could be easily solved by checking if the cache entry exists.

I think reads and writes on this map should be also thread safe. And ideally we should check if there is some entry in the cache for a given key before overwriting it here.

Signed-off-by: chrismark <chrismarkou92@gmail.com>

jsoriano

Thanks, this is looking good. Only some nitpicking comments added.

jsoriano · 2021-05-18T10:02:09Z

metricbeat/module/kubernetes/kubernetes.go

+	fCache := m.kubeStateMetricsCache.cacheMap[hash]
+	if _, ok := m.kubeStateMetricsCache.cacheMap[hash]; !ok {


Suggested change

fCache := m.kubeStateMetricsCache.cacheMap[hash]

if _, ok := m.kubeStateMetricsCache.cacheMap[hash]; !ok {

fCache, ok := m.kubeStateMetricsCache.cacheMap[hash]

if !ok {

jsoriano · 2021-05-18T10:02:38Z

metricbeat/module/kubernetes/kubernetes.go

+
+	fCache := m.kubeStateMetricsCache.cacheMap[hash]
+	if _, ok := m.kubeStateMetricsCache.cacheMap[hash]; !ok {
+		return nil, fmt.Errorf("Could not get kube_state_metrics cache entry for %s ", hash)


Suggested change

return nil, fmt.Errorf("Could not get kube_state_metrics cache entry for %s ", hash)

return nil, fmt.Errorf("could not get kube_state_metrics cache entry for %s ", hash)

jsoriano · 2021-05-18T10:07:32Z

metricbeat/module/kubernetes/kubernetes.go

+}
+
+func (m *module) GetSharedFamilies(prometheus p.Prometheus) ([]*dto.MetricFamily, error) {
+	now := time.Now()


Should this be done after getting the lock? If not, if a call to GetFamilies takes more than the period, all waiting metricsets will request the families again instead of reusing the ones just received, and the waiting metricset that end up requesting the families again will store an "old" timestamp.

jsoriano · 2021-05-18T10:11:41Z

metricbeat/module/kubernetes/kubernetes.go

+}
+
+func generateCacheHash(host []string) string {
+	return fmt.Sprintf("%s", host)


Consider using something like https://github.com/mitchellh/hashstructure for hashing.

jsoriano · 2021-05-18T10:15:09Z

metricbeat/module/kubernetes/kubernetes.go

+		cacheMap: make(map[string]*familiesCache),
+	}
+	return func(base mb.BaseModule) (mb.Module, error) {
+		hash := generateCacheHash(base.Config().Hosts)


In principle the hash is always going to be the same during the life of this module. Wdyt about storing it in module{} so it doesn't need to be recalculated every time? Actually, for the same reason, the module could keep a reference to the cache entry directly.

Signed-off-by: chrismark <chrismarkou92@gmail.com>

jsoriano

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ChrsMark added 6 commits May 10, 2021 11:41

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report error too

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ChrsMark added refactoring Team:Integrations Label for the Integrations team kubernetes Enable builds in the CI for kubernetes labels May 10, 2021

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ChrsMark added 2 commits May 11, 2021 18:44

Remove sync fetcher

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fix prometheus helper

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fix leftover

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Use a global cache on module's level

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ChrsMark added 2 commits May 17, 2021 15:22

Tune all state_* metrics

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Merge remote-tracking branch 'upstream/master' into refactor_state_me…

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…trics

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Secure cacheMap with lock

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apply review suggestions

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ChrsMark merged commit 96481f1 into elastic:master May 18, 2021

ChrsMark mentioned this pull request May 18, 2021

Cherry-pick #25640 to 7.x: Refactor state_* metricsets to share response from endpoint #25759

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ChrsMark added a commit to ChrsMark/beats that referenced this pull request May 18, 2021

Refactor state_* metricsets to share response from endpoint (elastic#…

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Refactor state_* metricsets to share response from endpoint (#25640) (#…

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This was referenced May 19, 2021

Refactor kubelet metricsets to share response from endpoint #25782

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Add granularity on Kubernetes integration elastic/integrations#1017

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ChrsMark mentioned this pull request May 28, 2021

Cherry-pick #25782 to 7.x: Refactor kubelet metricsets to share response from endpoint #25982

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Feature/cache expiration #31785

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ChrsMark mentioned this pull request Aug 4, 2022

Feature/remove k8s cache #32539

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constanca-m mentioned this pull request Nov 30, 2023

[Metricbeat][Kubernetes] Refactor watchers used in Kubernetes metricsets for metadata enrichment #37243

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MichaelKatsoulis mentioned this pull request Dec 7, 2023

[Metricbeat][Kubernetes] Share watchers between metricsets #37332

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	// Part of newF is also setting up the configuration by processing additional
	// Part of new is also setting up the configuration by processing additional

		fCache := m.kubeStateMetricsCache.cacheMap[hash]
		if _, ok := m.kubeStateMetricsCache.cacheMap[hash]; !ok {

	return nil, fmt.Errorf("Could not get kube_state_metrics cache entry for %s ", hash)
	return nil, fmt.Errorf("could not get kube_state_metrics cache entry for %s ", hash)

Refactor state_* metricsets to share response from endpoint #25640

Refactor state_* metricsets to share response from endpoint #25640

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ChrsMark commented May 10, 2021 • edited Loading

What does this PR do?

Why is it important?

Checklist

Author's Checklist

How to test this PR locally

Related issues

elasticmachine commented May 10, 2021

ChrsMark commented May 10, 2021

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