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https://issues.apache.org/jira/browse/KAFKA-8946?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
huxihx updated KAFKA-8946:
--------------------------
Component/s: (was: KafkaConnect)
> Single byte header issues WARN logging
> --------------------------------------
>
> Key: KAFKA-8946
> URL: https://issues.apache.org/jira/browse/KAFKA-8946
> Project: Kafka
> Issue Type: Improvement
> Affects Versions: 2.3.0
> Reporter: Henning Treu
> Priority: Minor
>
> Setting a single byte header like
> {code:java}
> headers.add("MY_CUSTOM_HEADER", new byte[] { 1 });
> {code}
> will cause a WARN message with full stack trace:
> {code:java}
> [2019-08-29 06:27:40,599] WARN Failed to deserialize value for header
> 'MY_CUSTOM_HEADER' on topic '<my_kafka_topic>', so using byte array
> (org.apache.kafka.connect.storage.SimpleHeaderConverter)
> java.lang.StringIndexOutOfBoundsException: String index out of range: 0
> at java.lang.String.charAt(String.java:658)
> at org.apache.kafka.connect.data.Values.parse(Values.java:816)
> at org.apache.kafka.connect.data.Values.parseString(Values.java:373)
> at
> org.apache.kafka.connect.storage.SimpleHeaderConverter.toConnectHeader(SimpleHeaderConverter.java:64)
> at
> org.apache.kafka.connect.runtime.WorkerSinkTask.convertHeadersFor(WorkerSinkTask.java:501)
> at
> org.apache.kafka.connect.runtime.WorkerSinkTask.convertMessages(WorkerSinkTask.java:469)
> at
> org.apache.kafka.connect.runtime.WorkerSinkTask.poll(WorkerSinkTask.java:301)
> at
> org.apache.kafka.connect.runtime.WorkerSinkTask.iteration(WorkerSinkTask.java:205)
> at
> org.apache.kafka.connect.runtime.WorkerSinkTask.execute(WorkerSinkTask.java:173)
> at org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:170)
> at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:214)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> Since Kafka will continue with the headers as
> {code:java}
> Schema.BYTES_SCHEMA
> {code}
> the warning seems a little harsh.
> There are two options:
> # Handle none-String header values explicitly
> # Drop the stacktrace logging and put it to an extra DEBUG log
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