Cherry-pick #20281 to 7.x: Add leader election for autodiscover #20510
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(cherry picked from commit 9ab9b97)
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kaiyan-sheng
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Aug 10, 2020
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Cherry-pick of PR #20281 to 7.x branch. Original message:
What does this PR do?
Implements leader election as part of kubernetes autodiscover provider. With this, when the beat is elected as leader it will start cluster scope metricsets.
Under the hood, all leader candidates will try to gain the lock on Lease object (https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.18/#lease-v1-coordination-k8s-io). When the lock is gained then the configured cluster wide mericsets will get started.
Why is it important?
To get rid of
Deploymentprocedure for the singleton Metricbeat instance which is needed for the cluster scope metricsets.Sample configuration that will start
state_nodemetricset when a leadership is gained:Then we can monitor the
leaseto check which provider holds the lock:Checklist
CHANGELOG.next.asciidocorCHANGELOG-developer.next.asciidoc.How to test this PR locally
Make sure that events for
state_nodeare being collected from only one metricbeat instance. You can the in the logs and verify that only one metricbeat has gained the lock so far.Monitor the
leaseobject to keep track of the lock holder:watch kubectl describe lease beats-cluster-leaderStop the Metricbeat instance that currently holds the lock and make sure that another one takes over and we keep getting events from
state-node. Make sure that theleasechanged holder (logs will also let us know that a new metricset is getting started)Also test without setting
identifierand check that it takes the default value properly likemetricbeat-cluster-leader.Check with old autodiscover (template based/hints based) for possible regressions.
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