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From "Manikumar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-6682) Kafka reconnection after broker restart
Date Tue, 20 Mar 2018 17:13:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-6682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16406717#comment-16406717
] 

Manikumar commented on KAFKA-6682:
----------------------------------

Looks like this fixed in : https://issues.apache.org/jira/browse/KAFKA-6260

> Kafka reconnection after broker restart
> ---------------------------------------
>
>                 Key: KAFKA-6682
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6682
>             Project: Kafka
>          Issue Type: Bug
>          Components: clients
>    Affects Versions: 1.0.0
>            Reporter: madi
>            Priority: Major
>
> I am using kafka producer plugin for logback (danielwegener) with the clients library
1.0.0 and after restart of broker all my JVMs connected to it get tons of the exceptions:
> {code:java}
> 11:22:48.738 [kafka-producer-network-thread | app-logback-relaxed] cid: 
> clid: E [        @] a: o.a.k.c.p.internals.Sender - [Producer 
> clientId=id-id-logback-relaxed] Uncaught error in kafka producer I/O 
> thread:  ex:java.lang.NullPointerException: null
>     at org.apache.kafka.common.network.Selector.pollSelectionKeys(Selector.java:436)
>     at org.apache.kafka.common.network.Selector.poll(Selector.java:399)
>     at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:460)
>     at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:239)
>     at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:163)
>     at java.lang.Thread.run(Thread.java:798){code}
> During restart there are still other brokers available behind LB.    
> Dosen't matter kafka is up again, only restarting JVM helps
> {code:java}
>     <appender name="kafkaLogAppender" class="com.github.danielwegener.logback.kafka.KafkaAppender">
>                 <!-- This is the default encoder that encodes every
log message to an utf8-encoded string  -->
>             <encoder>
>                    
>  <pattern>%date{"yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"} ${HOSTNAME} 
> [%thread] %logger{32} - %message ex:%exf%n</pattern>
>             </encoder>
>             <topic>mytopichere</topic>
>                 <!-- we don't care how the log messages will be partitioned 
-->
>             <keyingStrategy class="com.github.danielwegener.logback.kafka.keying.HostNameKeyingStrategy"
/>
>                 <!-- use async delivery. the application threads are
not blocked by logging -->
>             <deliveryStrategy class="com.github.danielwegener.logback.kafka.delivery.AsynchronousDeliveryStrategy"
/>
>                 <!-- each <producerConfig> translates to regular
kafka-client config (format: key=value) -->
>                
>  <!-- producer configs are documented here: 
> https://kafka.apache.org/documentation.html#newproducerconfigs -->
>                 <!-- bootstrap.servers is the only mandatory producerConfig
-->
>             <producerConfig>bootstrap.servers=10.99.99.1:9092</producerConfig>
>                 <!-- don't wait for a broker to ack the reception of
a batch.  -->
>             <producerConfig>acks=0</producerConfig>
>                 <!-- even if the producer buffer runs full, do not
block the application but start to drop messages -->
>             <producerConfig>block.on.buffer.full=false</producerConfig>
>                 <!-- define a client-id that you use to identify yourself
against the kafka broker -->
>             <producerConfig>client.id=${HOSTNAME}-${CONTEXT_NAME}-logback-relaxed</producerConfig>
>                 <!-- use gzip to compress each batch of log messages.
valid values: none, gzip, snappy  -->
>                 <!-- do przetestowania narzut -->
>             <producerConfig>compression.type=none</producerConfig>
>                
>  <!-- there is no fallback <appender-ref>. If this appender 
> cannot deliver, it will drop its messages. -->
>             <producerConfig>max.block.ms=0</producerConfig>
>     </appender>{code}
> I provide loadbalancer address in bootstrap servers here. There are three kafka brokers
behind.
> {code:java}
> java version "1.7.0"
> Java(TM) SE Runtime Environment (build pap6470sr9fp60ifix-20161110_01(SR9 FP60)+IV90630+IV90578))
> IBM J9 VM (build 2.6, JRE 1.7.0 AIX ppc64-64 Compressed References 20161005_321282 (JIT
enabled, AOT enabled)
> J9VM - R26_Java726_SR9_20161005_1259_B321282
> JIT  - tr.r11_20161001_125404
> GC   - R26_Java726_SR9_20161005_1259_B321282_CMPRSS
> J9CL - 20161005_321282)
> JCL - 20161021_01 based on Oracle jdk7u121-b15{code}



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