Getting Fatal error during KafkaServerStartable startup Prepare to shutdown kafka server KafkaServerStartable java lang NumberFormatException For input string delete

Question

Whenever I start the Kafka broker, it's getting started but going down immediately. When I checked in server.log, I am seeing the below error.

FATAL Fatal error during KafkaServerStartable startup. Prepare to shutdown (kafka.server.KafkaServerStartable)
java.lang.NumberFormatException: For input string: "delete"
        at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
        at java.lang.Integer.parseInt(Integer.java:580)
        at java.lang.Integer.parseInt(Integer.java:615)
        at scala.collection.immutable.StringLike$class.toInt(StringLike.scala:229)
        at scala.collection.immutable.StringOps.toInt(StringOps.scala:31)
        at kafka.log.Log$.parseTopicPartitionName(Log.scala:973)
        at kafka.log.LogManager$$anonfun$loadLogs$2$$anonfun$3$$anonfun$apply$10$$anonfun$apply$1.apply$mcV$sp(LogManager.scala:148)
        at kafka.utils.CoreUtils$$anon$1.run(CoreUtils.scala:56)
        at java.util.concurrent.Executors$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)

I am completely blocked due to this.

Kindly help me to fix this issue.

Answer 1

Hi@B,

There may be a problem with your server properties. Check all the properties properly. If you get the same error, then share your properties here.

Hope this will help.

To know more about Kafka, get your Apache Kafka certification course today.

Thank You

Comments

Thanks for your suggestion. Let me re-validate the server.properties located in /etc/kafka/2.5.3.0-37/0/.

Also kindly let me know if I miss anything in troubleshooting.

---

Hi@B,

Sure. If you get the same error, then share your entries in the server.properties file.

---

Hi@B,

When I was working on Kafka, I also faced a similar kind of error. In my case, I have a problem with the zookeeper. In Kafka, Zookeeper is used to manage the Kafka server. Check with the below steps.

$ ./bin/zkServer.sh start
$ ./bin/zkCli.sh
$ ./bin/kafka-server-start.sh config/server.properties

---

Ok. Sure. I will try the steps you suggested and let you know how it goes.

---

Now this issue has been resolved successfully. Below were the steps I followed.
- Except meta.properties, removed all the files under /kafka-logs directory (for safer side, take backup of all the files under /kafka-logs directory).

- There is no impact in deleting the files under /kafka-logs, because all the files/directories will be recreated automatically once the kafka broker starts.

- Start the issue kafka brokers and verify /var/log/kafka/server.log.

That's All.....

---

Hi @MD,

My hearty thanks to you for spending your valuable time with me in troubleshooting.

Kindly mark this thread as resolved and keep it visible. It would be helpful for others future references.

We will meet once again in new interesting issues if anything comes.

---

Hi@B,

Great. We are always here to help you. Kindly upvote the answer so that it will help others.