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https://issues.apache.org/jira/browse/KAFKA-3468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17119027#comment-17119027
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Brad Schoening commented on KAFKA-3468:
---------------------------------------
Similar behavior occurs when security.protocol is not configured correctly, for
example using plaintext instead of SSL will cause an infinite retry w/out
warning messages.
> Java clients never fail when bootstrap uses incorrect port
> ----------------------------------------------------------
>
> Key: KAFKA-3468
> URL: https://issues.apache.org/jira/browse/KAFKA-3468
> Project: Kafka
> Issue Type: Bug
> Components: clients
> Reporter: Grant Henke
> Priority: Major
>
> When a client bootstrap uses a valid host but an incorrect port, the java
> clients will never fail but instead loop forever trying to fetch metadata. A
> sample debug log of the consumer is:
> {noformat}
> [2016-03-25 11:37:39,880] DEBUG Initialize connection to node -1 for sending
> metadata request (org.apache.kafka.clients.NetworkClient:629)
> [2016-03-25 11:37:39,880] DEBUG Initiating connection to node -1 at
> localhost:9999. (org.apache.kafka.clients.NetworkClient:492)
> [2016-03-25 11:37:39,881] DEBUG Node -1 disconnected.
> (org.apache.kafka.clients.NetworkClient:459)
> [2016-03-25 11:37:39,881] DEBUG Give up sending metadata request since no
> node is available (org.apache.kafka.clients.NetworkClient:614)
> [2016-03-25 11:37:39,983] DEBUG Initialize connection to node -1 for sending
> metadata request (org.apache.kafka.clients.NetworkClient:629)
> [2016-03-25 11:37:39,983] DEBUG Initiating connection to node -1 at
> localhost:9999. (org.apache.kafka.clients.NetworkClient:492)
> [2016-03-25 11:37:39,984] DEBUG Node -1 disconnected.
> (org.apache.kafka.clients.NetworkClient:459)
> [2016-03-25 11:37:39,985] DEBUG Give up sending metadata request since no
> node is available (org.apache.kafka.clients.NetworkClient:614)
> [2016-03-25 11:37:40,090] DEBUG Initialize connection to node -1 for sending
> metadata request (org.apache.kafka.clients.NetworkClient:629)
> [2016-03-25 11:37:40,090] DEBUG Initiating connection to node -1 at
> localhost:9999. (org.apache.kafka.clients.NetworkClient:492)
> [2016-03-25 11:37:40,091] DEBUG Node -1 disconnected.
> (org.apache.kafka.clients.NetworkClient:459)
> [2016-03-25 11:37:40,091] DEBUG Give up sending metadata request since no
> node is available (org.apache.kafka.clients.NetworkClient:614)
> {noformat}
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