>2015-08-20 16:55:43,242 [kafka-producer-network-thread | producer-1] DEBUG
>o.apache.kafka.clients.NetworkClient - Trying to send metadata request to node >0
>2015-08-20 16:55:43,246 [kafka-producer-network-thread | producer-1] DEBUG
>o.apache.kafka.clients.NetworkClient - Init connection to node 0 for sending
>metadata request in the next iteration
>2015-08-20 16:55:43,246 [kafka-producer-network-thread | producer-1] DEBUG
>o.apache.kafka.clients.NetworkClient - Initiating connection to node 0 at
>data-hk-1.dev.blah.com:9192.
>2015-08-20 16:55:43,250 [kafka-producer-network-thread | producer-1] DEBUG
>o.apache.kafka.clients.NetworkClient - Trying to send metadata request to node >0
>2015-08-20 16:55:43,255 [kafka-producer-network-thread | producer-1] DEBUG
>o.apache.kafka.clients.NetworkClient - Completed connection to node 0
>2015-08-20 16:55:48,252 [kafka-producer-network-thread | producer-1] DEBUG
>o.apache.kafka.clients.NetworkClient - Trying to send metadata request to node >0
>2015-08-20 16:55:48,254 [kafka-producer-network-thread | producer-1] DEBUG
>o.apache.kafka.clients.NetworkClient - Sending metadata request
>ClientRequest(expectResponse=true, payload=null,
>request=RequestSend(header={api_key=3,api_version=0,correlation_id=1,client_id=producer-1},
> body={topics=[]})) to node 0
>SLF4J: Failed toString() invocation on an object of type
>[org.apache.kafka.common.Cluster]
>java.lang.NullPointerException
> at org.apache.kafka.common.PartitionInfo.toString(PartitionInfo.java:72)
> at java.lang.String.valueOf(String.java:2979)
> at java.lang.StringBuilder.append(StringBuilder.java:131)
> at java.util.AbstractCollection.toString(AbstractCollection.java:462)
> at java.lang.String.valueOf(String.java:2979)
> at java.lang.StringBuilder.append(StringBuilder.java:131)
> at org.apache.kafka.common.Cluster.toString(Cluster.java:171)
> at
> org.slf4j.helpers.MessageFormatter.safeObjectAppend(MessageFormatter.java:297)
> at
> org.slf4j.helpers.MessageFormatter.deeplyAppendParameter(MessageFormatter.java:269)
> at
> org.slf4j.helpers.MessageFormatter.arrayFormat(MessageFormatter.java:227)
> at
> ch.qos.logback.classic.spi.LoggingEvent.getFormattedMessage(LoggingEvent.java:298)
> at
> ch.qos.logback.classic.spi.LoggingEvent.prepareForDeferredProcessing(LoggingEvent.java:208)
> at
> ch.qos.logback.core.OutputStreamAppender.subAppend(OutputStreamAppender.java:212)
> at
> ch.qos.logback.core.OutputStreamAppender.append(OutputStreamAppender.java:103)
> at
> ch.qos.logback.core.UnsynchronizedAppenderBase.doAppend(UnsynchronizedAppenderBase.java:88)
> at
> ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:48)
> at ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:273)
> at ch.qos.logback.classic.Logger.callAppenders(Logger.java:260)
> at
> ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:442)
> at ch.qos.logback.classic.Logger.filterAndLog_2(Logger.java:433)
> at ch.qos.logback.classic.Logger.debug(Logger.java:511)
> at
> org.apache.kafka.clients.producer.internals.Metadata.update(Metadata.java:141)
> at
> org.apache.kafka.clients.NetworkClient.handleMetadataResponse(NetworkClient.java:313)
> at
> org.apache.kafka.clients.NetworkClient.handleCompletedReceives(NetworkClient.java:298)
> at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:199)
> at
> org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:191)
> at
> org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:122)
> at java.lang.Thread.run(Thread.java:744)
>2015-08-20 16:55:48,258 [kafka-producer-network-thread | producer-1] DEBUG
>o.a.k.c.producer.internals.Metadata - Updated cluster metadata version 3 to
>[FAILED toString()]
