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https://issues.apache.org/jira/browse/KAFKA-17792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17889685#comment-17889685
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Martin Sillence commented on KAFKA-17792:
-----------------------------------------
https://github.com/apache/kafka/pull/17510
> header parsing ends up timing out and using large quantities of memory if the
> string looks like a number
> --------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-17792
> URL: https://issues.apache.org/jira/browse/KAFKA-17792
> Project: Kafka
> Issue Type: Bug
> Components: connect
> Reporter: Martin Sillence
> Priority: Major
>
> {color:#172b4d}We have trace headers such as:{color}
> {color:#172b4d}"X-B3-SpanId": "74320e6e26adc8f8"{color}
> {color:#172b4d}if however the value happens to be: "407127e212797209"{color}
> {color:#172b4d}This is then treated as a numeric value and it tries to
> convert this as a numeric representation and an exact value using
> BigDecimal{color}
> we end up with the trace:
> BigDecimal.setScale(int, RoundingMode) line: 2876
> Values$ValueParser.parseAsExactDecimal(BigDecimal) line: 1044
> Values$ValueParser.parseAsNumber(String) line: 1025
> Values$ValueParser.parseNextToken(boolean, String) line: 892
> Values$ValueParser.parse(boolean) line: 875
> Values.parseString(String) line: 415
> SimpleHeaderConverter.toConnectHeader(String, String, byte[]) line: 68
> WorkerSinkTask.convertHeadersFor(ConsumerRecord<byte[],byte[]>) line: 578
>
> this takes a long time to convert to an exact representation of a 212 billion
> digit integer
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