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https://issues.apache.org/jira/browse/SCB-582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16480231#comment-16480231
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ASF GitHub Bot commented on SCB-582:
------------------------------------
liubao68 commented on a change in pull request #704: [SCB-582]Provide a way to
protect instance removal
URL:
https://github.com/apache/incubator-servicecomb-java-chassis/pull/704#discussion_r189175400
##########
File path:
service-registry/src/main/java/org/apache/servicecomb/serviceregistry/consumer/MicroserviceVersions.java
##########
@@ -169,6 +166,28 @@ private void setInstances(List<MicroserviceInstance>
pulledInstances, String rev
}
}
+ private List<MicroserviceInstance> mergeInstances(List<MicroserviceInstance>
pulledInstances,
+ List<MicroserviceInstance> inUseInstances) {
+ List<MicroserviceInstance> upInstances = pulledInstances
+ .stream()
+ .filter(instance -> {
+ return MicroserviceInstanceStatus.UP.equals(instance.getStatus());
+ })
+ .collect(Collectors.toList());
+ if (upInstances.isEmpty() && inUseInstances != null &&
ServiceRegistryConfig.INSTANCE.isEmptyInstanceProtectionEnabled()) {
+ MicroserviceInstancePing ping =
SPIServiceUtils.getPriorityHighestService(MicroserviceInstancePing.class);
+ inUseInstances.stream()
+ .forEach(instance -> {
+ if (!upInstances.contains(instance)) {
+ if (ping.ping(instance)) {
Review comment:
This scenario is rarely as I explained above, mostly because of service
center bugs. And this health check run a separate background thread, will not
influence normal performance.
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> Provide a way to protection for instance removal
> ------------------------------------------------
>
> Key: SCB-582
> URL: https://issues.apache.org/jira/browse/SCB-582
> Project: Apache ServiceComb
> Issue Type: New Feature
> Components: Java-Chassis
> Reporter: liubao
> Assignee: liubao
> Priority: Major
> Fix For: java-chassis-1.0.0-m2
>
>
> In some applications, each microservice have fixed instances and rarely
> change. But for some reason, heartbeat to service center is not stable. In
> this scenario, instances will get lost and result in invocation failure.
>
> To deal with this problem, we need to provide a way to protect instance
> removal. That's when there is instance removal, we first check(ping)the
> instance to see if it is reachable. If it's reachable, we don't remove it.
>
> Since this protection is not fit for docker applications or scenarios where
> instances are constantly removed and added, and resources(hosts ,ip, port)
> are reused, this feature is an optional feature and users can open it when
> necessary.
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