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https://issues.apache.org/jira/browse/KNOX-2978?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17780277#comment-17780277
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ASF subversion and git services commented on KNOX-2978:
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Commit bc4d5486bb1b60728a1c6376336a13c627c5aa5b in knox's branch
refs/heads/master from Attila Magyar
[ https://gitbox.apache.org/repos/asf?p=knox.git;h=bc4d5486b ]
KNOX-2978 - Race condition between Service Discovery and Polling Config
Analyzer (#811)
> Race condition between Service Discovery and Polling Config Analyzer
> --------------------------------------------------------------------
>
> Key: KNOX-2978
> URL: https://issues.apache.org/jira/browse/KNOX-2978
> Project: Apache Knox
> Issue Type: Improvement
> Reporter: Attila Magyar
> Assignee: Attila Magyar
> Priority: Major
> Time Spent: 20m
> Remaining Estimate: 0h
>
> When a config change is detected by the Polling Config Analyzer then then the
> cache used by the service discovery will be cleared. If this happens when
> discovery is in progress then a NullPointerException will happen.
> {code}
> private ServiceDetails getServiceDetails(ServiceDiscoveryConfig
> serviceDiscoveryConfig, ApiService service) {
> return getClusterServices(serviceDiscoveryConfig).getIfPresent(service);
> // <= NPE
> }
> {code}
> {code}
> @Override
> public void onConfigurationChange(String source, String clusterName) {
> log.clearServiceDiscoveryRepository();
> repository.clear(); // this will cause the NPE
> }
> {code}
> This was observed on a live cluster when certain cluster properties was
> changed during knox startup.
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