xds: fix a concurrency issue in CSDS ClientStatus responses #8795
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Fixes #8642 |
dapengzhang0
reviewed
Jan 5, 2022
sergiitk
commented
Jan 11, 2022
| @Override | ||
| Map<String, ResourceMetadata> getSubscribedResourcesMetadata(ResourceType type) { | ||
| Map<ResourceType, Map<String, ResourceMetadata>> getSubscribedResourcesMetadataSnapshot() { |
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Note: this was needed because I discovered this test to be false negative, see PR description:
Fix false negative in fetchClientConfig_unexpectedException,
where expected exception was actually caused by missing
bootstrap data, not by throwing error from the local
class implementation.
sergiitk
commented
Jan 11, 2022
Fixes an issue with ClientXdsClient.getSubscribedResourcesMetadata() executed out of shared synchronization context, and leading to: - each individual config dump containing outdated data when an xDS resource is updated during CsdsService preparing the response - config dumps for different services being out-of-sync with each other when any of the related xDS resources is updated during CsdsService preparing the response The fix replaces getSubscribedResourcesMetadata(ResourceType type) with atomic getSubscribedResourcesMetadataSnapshot() returning a snapshot of all resources for each type as they are at the moment of a CSDS request.
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Ready for another review. |
dapengzhang0
approved these changes
Jan 12, 2022
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Fixes an issue with ClientXdsClient.getSubscribedResourcesMetadata()
executed out of shared synchronization context, and leading to:
an xDS resource is updated during CsdsService preparing the response
other when any of the related xDS resources is updated during
CsdsService preparing the response
The fix replaces getSubscribedResourcesMetadata(ResourceType type)
with atomic getSubscribedResourcesMetadataSnapshot() returning
a snapshot of all resources for each type as they are
at the moment of a CSDS request.
Fix false negative in fetchClientConfig_unexpectedException,
where expected exception was actually caused by missing
bootstrap data, not by throwing error from the local
class implementation.