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https://issues.apache.org/jira/browse/KAFKA-9775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17068581#comment-17068581
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ASF GitHub Bot commented on KAFKA-9775:
---------------------------------------

tombentley commented on pull request #8373: KAFKA-9775: Fix 
IllegalFormatConversionException in ToolsUtils
URL: https://github.com/apache/kafka/pull/8373
 
 
   The runtime type of Metric.metricValue() needn't always be a Double,
   for example, if it's a gauge from IntGaugeSuite.
   Since it's impossible to format non-double values with 3 point precision
   IllegalFormatConversionException resulted.
   
   
 
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> IllegalFormatConversionException from kafka-consumer-perf-test.sh
> -----------------------------------------------------------------
>
>                 Key: KAFKA-9775
>                 URL: https://issues.apache.org/jira/browse/KAFKA-9775
>             Project: Kafka
>          Issue Type: Bug
>          Components: tools
>            Reporter: Tom Bentley
>            Assignee: Tom Bentley
>            Priority: Major
>
> Exception in thread "main" java.util.IllegalFormatConversionException: f != 
> java.lang.Integer
>       at 
> java.base/java.util.Formatter$FormatSpecifier.failConversion(Formatter.java:4426)
>       at 
> java.base/java.util.Formatter$FormatSpecifier.printFloat(Formatter.java:2951)
>       at 
> java.base/java.util.Formatter$FormatSpecifier.print(Formatter.java:2898)
>       at java.base/java.util.Formatter.format(Formatter.java:2673)
>       at java.base/java.util.Formatter.format(Formatter.java:2609)
>       at java.base/java.lang.String.format(String.java:2897)
>       at scala.collection.immutable.StringLike.format(StringLike.scala:354)
>       at scala.collection.immutable.StringLike.format$(StringLike.scala:353)
>       at scala.collection.immutable.StringOps.format(StringOps.scala:33)
>       at kafka.utils.ToolsUtils$.$anonfun$printMetrics$3(ToolsUtils.scala:60)
>       at 
> kafka.utils.ToolsUtils$.$anonfun$printMetrics$3$adapted(ToolsUtils.scala:58)
>       at 
> scala.collection.mutable.ResizableArray.foreach(ResizableArray.scala:62)
>       at 
> scala.collection.mutable.ResizableArray.foreach$(ResizableArray.scala:55)
>       at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:49)
>       at kafka.utils.ToolsUtils$.printMetrics(ToolsUtils.scala:58)
>       at kafka.tools.ConsumerPerformance$.main(ConsumerPerformance.scala:82)
>       at kafka.tools.ConsumerPerformance.main(ConsumerPerformance.scala)



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