Wait on readiness service on start #102325
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Node.start() currently does not return until the node is serving http. However, other parts of the system may not be quite ready. For example, file settings may not have been applied, and we may not yet have a master node. The readiness service's purpose is to identify when the node is actually ready for serving requests. This commit adjusts the end of Node start to wait on the readiness service being ready. The ramifications are that the main Elasticsearch thread will not exit until the node is actually ready to serve requests, and the cli will not exit (when in daemon mode) until the node is ready.
rjernst
added
>refactoring
:Core/Infra/Node Lifecycle
|
Pinging @elastic/es-core-infra (Team:Core/Infra) |
elasticsearchmachine
added
v8.12.0
Team:Core/Infra
ldematte
approved these changes
Nov 20, 2023
| CountDownLatch ready = new CountDownLatch(1); | ||
| readinessService.addBoundAddressListener(address -> ready.countDown()); | ||
| try { | ||
| ready.await(); |
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We are not introducing a timeout here - I suppose there are plenty of other places where we already timeout so there is no need for another one here, correct?
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Yep exactly, there are other timeouts on startup eg systemd has a 75 second default timeout. Right now we will actually report to systemd that the node is ready before the readiness probe responds true, but this change will align them.
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Node.start() currently does not return until the node is serving http. However, other parts of the system may not be quite ready. For example, file settings may not have been applied, and we may not yet have a master node. The readiness service's purpose is to identify when the node is actually ready for serving requests.
This commit adjusts the end of Node start to wait on the readiness service being ready. The ramifications are that the main Elasticsearch thread will not exit until the node is actually ready to serve requests, and the cli will not exit (when in daemon mode) until the node is ready.