无法解码spring云流defaultkafkaheadermapper中的json类型

iyfjxgzm  于 2021-06-04  发布在  Kafka
关注(0)|答案(1)|浏览(771)

我们正在使用springcloudstream并计划升级我们的kafka版本。
我们的应用程序使用 spring-cloud-stream:2.0.0 (spring kafka 2.1.7)使用apache kafka服务器 1.0.1 同时使用 spring-cloud-sleuth:2.0.0 用于跟踪。
我们要把Kafka服务器升级到 2.3.0 所以需要升级到 spring-boot 2.2.x (Hoxton)spring-cloud-sleuth:2.2.0 以及 spring-cloud-stream:3.0.3 (Horsham.SR3) .
我们有约200个应用程序,使用Kafka,因此升级将逐步进行,所以作为中间状态,我们将有较新版本的生产者和消费者使用旧版本。
我们的消费者正在使用 @StreamListener .
在我们的测试中,我们遇到了一个问题:解析大多数类型为的头 String 得到以下结果:

ERROR 27448 --- [container-0-C-1] o.s.c.s.b.k.KafkaMessageChannelBinder$4  : Could not decode json type: ecb89ccb3e79418b for key: X-B3-TraceId
com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'ecb89ccb3e79418b': was expecting ('true', 'false' or 'null')
 at [Source: (byte[])"ecb89ccb3e79418b"; line: 1, column: 33]
    at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1804) ~[jackson-core-2.9.6.jar:2.9.6]
    at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:679) ~[jackson-core-2.9.6.jar:2.9.6]
    at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._reportInvalidToken(UTF8StreamJsonParser.java:3526) ~[jackson-core-2.9.6.jar:2.9.6]
    at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._handleUnexpectedValue(UTF8StreamJsonParser.java:2621) ~[jackson-core-2.9.6.jar:2.9.6]
    at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._nextTokenNotInObject(UTF8StreamJsonParser.java:826) ~[jackson-core-2.9.6.jar:2.9.6]
    at com.fasterxml.jackson.core.json.UTF8StreamJsonParser.nextToken(UTF8StreamJsonParser.java:723) ~[jackson-core-2.9.6.jar:2.9.6]
    at com.fasterxml.jackson.databind.ObjectMapper._initForReading(ObjectMapper.java:4141) ~[jackson-databind-2.9.6.jar:2.9.6]
    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4000) ~[jackson-databind-2.9.6.jar:2.9.6]
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3091) ~[jackson-databind-2.9.6.jar:2.9.6]
    at org.springframework.kafka.support.DefaultKafkaHeaderMapper.lambda$toHeaders$1(DefaultKafkaHeaderMapper.java:233) ~[spring-kafka-2.1.7.RELEASE.jar:2.1.7.RELEASE]
    at java.lang.Iterable.forEach(Iterable.java:75) ~[na:1.8.0_221]
    at org.springframework.kafka.support.DefaultKafkaHeaderMapper.toHeaders(DefaultKafkaHeaderMapper.java:216) ~[spring-kafka-2.1.7.RELEASE.jar:2.1.7.RELEASE]
    at org.springframework.cloud.stream.binder.kafka.KafkaMessageChannelBinder$4.toHeaders(KafkaMessageChannelBinder.java:554) ~[spring-cloud-stream-binder-kafka-2.0.0.RELEASE.jar:2.0.0.RELEASE]
    at org.springframework.kafka.support.converter.MessagingMessageConverter.toMessage(MessagingMessageConverter.java:106) ~[spring-kafka-2.1.7.RELEASE.jar:2.1.7.RELEASE]
    at org.springframework.kafka.listener.adapter.MessagingMessageListenerAdapter.toMessagingMessage(MessagingMessageListenerAdapter.java:229) ~[spring-kafka-2.1.7.RELEASE.jar:2.1.7.RELEASE]
...

类型标题为:

{spanTraceId=java.lang.String, spanId=java.lang.String, spanParentSpanId=java.lang.String, nativeHeaders=org.springframework.util.LinkedMultiValueMap, X-B3-SpanId=java.lang.String, X-B3-ParentSpanId=java.lang.String, scst_partition=java.lang.Integer, X-B3-Sampled=java.lang.String, X-B3-TraceId=java.lang.String, spanSampled=java.lang.String, contentType=java.lang.String}

例如 X-B3-SpanId sleuth添加的是string类型,值是:ecb89ccb3e79418b,它不是json string,因此objectmapper在转换为string object时失败:

headers.put(h.key(), getObjectMapper().readValue(h.value(), type))

当我们有字符串类型时,它似乎不应该使用objectmapper,因此我们的老消费者失败了。
在使用新的生产者和旧的消费者时,有没有办法防止这个问题?

hmae6n7t

hmae6n7t1#

您可以配置 DefaultKafkaHeaderMapper 要与旧版本兼容:

/**
     * Set to true to encode String-valued headers as JSON ("..."), by default just the
     * raw String value is converted to a byte array using the configured charset. Set to
     * true if a consumer of the outbound record is using Spring for Apache Kafka version
     * less than 2.3
     * @param encodeStrings true to encode (default false).
     * @since 2.3
     */
    public void setEncodeStrings(boolean encodeStrings) {
        this.encodeStrings = encodeStrings;
    }

另请参见https://docs.spring.io/spring-cloud-stream-binder-kafka/docs/3.0.10.release/reference/html/spring-cloud-stream-binder-kafka.html#_kafka_binder_properties spring.cloud.stream.kafka.binder.headerMapperBeanName

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