ijuma commented on code in PR #12590:
URL: https://github.com/apache/kafka/pull/12590#discussion_r968463099
##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/Fetcher.java:
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@@ -1933,11 +1941,76 @@ private Map<String, String>
topicPartitionTags(TopicPartition tp) {
}
}
+ // Visible for testing
+ void maybeCloseFetchSessions(final Timer timer) {
+ final Cluster cluster = metadata.fetch();
+ final List<RequestFuture<ClientResponse>> requestFutures = new
ArrayList<>();
+ for (final Map.Entry<Integer, FetchSessionHandler> entry :
sessionHandlers.entrySet()) {
+ final FetchSessionHandler sessionHandler = entry.getValue();
+ // set the session handler to notify close. This will set the next
metadata request to send close message.
+ sessionHandler.notifyClose();
+ final Integer fetchTargetNodeId = entry.getKey();
+
+ // Fet
+ final Node fetchTarget = cluster.nodeById(fetchTargetNodeId);
+ if (fetchTarget == null || client.isUnavailable(fetchTarget)) {
+ log.debug("Skip sending close session request to broker {}
since it is not reachable", fetchTarget);
+ continue;
+ }
+ final RequestFuture<ClientResponse> responseFuture =
sendFetchRequestToNode(sessionHandler.newBuilder().build(), fetchTarget);
+ responseFuture.addListener(new
RequestFutureListener<ClientResponse>() {
+ @Override
+ public void onSuccess(ClientResponse value) {
+ log.info("Successfully sent a close message to {} for
session {}", fetchTargetNodeId, sessionHandler.sessionId());
+ }
+
+ @Override
+ public void onFailure(RuntimeException e) {
+ log.warn("Unable to send a close message to {} for session
{}. " +
+ "This may result in unnecessary fetch sessions at the
broker.", fetchTargetNodeId, sessionHandler.sessionId(), e);
Review Comment:
If their credentials are incorrect, they would get other errors somewhere
else, right? Generally, `warn` errors like this tend to generate a bunch of
confusion without much benefit. In a distributed system, requests are expected
to fail at times. Given that we have lived for years without closing sessions,
it seems unnecessary to now `warn` so aggressively when it fails.
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