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MINOR: Change ordering of checks to prevent log spam on metadata updates (#13447) 

On startup, we always update the metadata. The topic ID also goes from null to defined. Move the epoch is null check to before the topic ID check to prevent log spam.

Reviewers: David Jacot <djacot@confluent.io>, Jason Gustafson <jason@confluent.io>
This commit is contained in:
Justine Olshan 2023-03-30 09:23:55 -07:00 committed by GitHub
parent 887d05559f
commit 6d9d65e666
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1 changed files with 9 additions and 3 deletions
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12
clients/src/main/java/org/apache/kafka/clients/Metadata.java
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@ -394,16 +394,22 @@ public class Metadata implements Closeable {
if (hasReliableLeaderEpoch && partitionMetadata.leaderEpoch.isPresent()) {
int newEpoch = partitionMetadata.leaderEpoch.get();
Integer currentEpoch = lastSeenLeaderEpochs.get(tp);
if (topicId != null && !topicId.equals(oldTopicId)) {
if (currentEpoch == null) {
// We have no previous info, so we can just insert the new epoch info
log.debug("Setting the last seen epoch of partition {} to {} since the last known epoch was undefined.",
tp, newEpoch);
lastSeenLeaderEpochs.put(tp, newEpoch);
return Optional.of(partitionMetadata);
} else if (topicId != null && !topicId.equals(oldTopicId)) {
// If the new topic ID is valid and different from the last seen topic ID, update the metadata.
// Between the time that a topic is deleted and re-created, the client may lose track of the
// corresponding topicId (i.e. `oldTopicId` will be null). In this case, when we discover the new
// topicId, we allow the corresponding leader epoch to override the last seen value.
log.info("Resetting the last seen epoch of partition {} to {} since the associated topicId changed from {} to {}",
tp, newEpoch, oldTopicId, topicId);
tp, newEpoch, oldTopicId, topicId);
lastSeenLeaderEpochs.put(tp, newEpoch);
return Optional.of(partitionMetadata);
} else if (currentEpoch == null || newEpoch >= currentEpoch) {
} else if (newEpoch >= currentEpoch) {
// If the received leader epoch is at least the same as the previous one, update the metadata
log.debug("Updating last seen epoch for partition {} from {} to epoch {} from new metadata", tp, currentEpoch, newEpoch);
lastSeenLeaderEpochs.put(tp, newEpoch);