kowshik commented on a change in pull request #9001:
URL: https://github.com/apache/kafka/pull/9001#discussion_r468111300
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File path: core/src/main/scala/kafka/server/FinalizedFeatureCache.scala
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@@ -82,18 +110,54 @@ object FinalizedFeatureCache extends Logging {
" The existing cache contents are %s").format(latest,
oldFeatureAndEpoch)
throw new FeatureCacheUpdateException(errorMsg)
} else {
- val incompatibleFeatures =
SupportedFeatures.incompatibleFeatures(latest.features)
+ val incompatibleFeatures =
brokerFeatures.incompatibleFeatures(latest.features)
if (!incompatibleFeatures.empty) {
val errorMsg = ("FinalizedFeatureCache update failed since feature
compatibility" +
" checks failed! Supported %s has incompatibilities with the latest
%s."
- ).format(SupportedFeatures.get, latest)
+ ).format(brokerFeatures.supportedFeatures, latest)
Review comment:
Good question. The existing behavior is that it shuts itself down, as
triggered by this LOC. The reason to do it is that an incompatible broker can
potentially do harmful things to a cluster (because max version level upgrades
are used for breaking changes):
https://github.com/apache/kafka/blob/89a3ba69e03acbe9635ee1039abb567bf0c6631b/core/src/main/scala/kafka/server/FinalizedFeatureChangeListener.scala#L154-L156.
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