排查Logstash2.4升级到5.0版本后Kafka不兼容问题

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参考文档：

/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-kafka-5.0.5/CHANGELOG.md
/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-kafka-5.0.5/DEVELOPER.md
/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-kafka-5.0.5/README.md.md
/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-kafka-5.0.5/lib/logstash/inputs/kafka.rb
/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-kafka-5.0.4/lib/logstash/outputs/kafka.rb

缘由：

之前对 ELKB 环境从 2.4 版本升级到最新的 5.0 稳定版本，主要升级步骤可以参考 http://www.linuxidc.com/Linux/2016-12/138217.htm，后来发现 kafka 集群运行报错，现在把排查过程记录如下，仅供参考

之前环境：

logstash2.4

logstash-input-kafka-2.0.9

logstash-output-kafka-2.0.5

kafka_2.10-0.8.2.2.tgz

升级后环境：

logstash5.0

logstash-input-kafka-2.0.9

logstash-output-kafka-2.0.5

报错信息：

[2016-11-16T14:35:44,739][ERROR][logstash.inputs.kafka] Unknown setting ‘zk_connect’ for kafka
[2016-11-16T14:35:44,741][ERROR][logstash.inputs.kafka] Unknown setting ‘topic_id’ for kafka
[2016-11-16T14:35:44,741][ERROR][logstash.inputs.kafka] Unknown setting ‘reset_beginning’ for kafka

实施步骤：

1，根据错误查看程序哪里报错

grep “Unknown setting” /usr/share/logstash/ -R
/usr/share/logstash/logstash-core/lib/logstash/config/mixin.rb: self.logger.error(“Unknown setting ‘#{name}’ for #{@plugin_name}”)

2，查看程序相关代码，发现需要查看 plugins 的 config 定义文件等

def validate_check_invalid_parameter_names(params)
invalid_params = params.keys
# Filter out parameters that match regexp keys.
# These are defined in plugins like this:
# config /foo.*/ => …
@config.each_key do |config_key|
if config_key.is_a?(Regexp)
invalid_params.reject! {|k| k =~ config_key}
elsif config_key.is_a?(String)
invalid_params.reject! {|k| k == config_key}
end
end
if invalid_params.size > 0
invalid_params.each do |name|
self.logger.error(“Unknown setting ‘#{name}’ for #{@plugin_name}”)
end
return false
end # if invalid_params.size > 0
return true
end # def validate_check_invalid_parameter_names

3，进入插件总目录查看具体信息

cd /usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-kafka-5.0.5

发现重点查看如下文件

grep config ./* -R |awk ‘{print $1}’ |uniq
./CHANGELOG.md:
./DEVELOPER.md:See
./lib/logstash/inputs/kafka.rb:#
./lib/logstash/inputs/kafka.rb:
./README.md:-
Binary

1）首先看 CHANGELOG.md，就有发现 logstash-input-3.0.0.beta1 开始就不在向后兼容，且剔除了 jruby-kafka，注意这里有个坑 2）会讲到，4.0.0 版本说开始支持 kafka 0.9，5.0.0 又说开始

支持 0.10 切不向后兼容，这破坏性更新也是够了。看来问题找到了我的 kafka 版本是 kafka_2.10-0.8.2.2.tgz，kafka 版本不兼容导致的。

CHANGELOG.md 部分文档如下：

## 5.0.4
– Update to Kafka version 0.10.0.1 for bug fixes
## 5.0.0
– Support for Kafka 0.10 which is not backward compatible with 0.9 broker.
## 4.0.0
– Republish all the gems under jruby.
– Update the plugin to the version 2.0 of the plugin api, this change is required for Logstash 5.0 compatibility. See https://github.com/elastic/logstash/issues/5141
– Support for Kafka 0.9 for LS 5.x
## 3.0.0.beta1
– Refactor to use new Java based consumer, bypassing jruby-kafka
– Breaking: Change configuration to match Kafka’s configuration. This version is not backward compatible

2）之前我看 DEVELOPER.md 文档时, 看配置语法都正确，还以为是却少依赖关系 jruby-kafka library 呢，这个再 logstash2.x 是在用的 (另外对比 logstash5.x 发现 5 版本少了不少插件。另外

kafka 版本写的是 0.8.1.1，看来这个 DEVELOPER.md 没有及时更新（与后面 kafka.rb 文件不一致），谁要是看到了麻烦及时更新啊，虽是小问题但是也可能误导我等屁民。当然也有可能是我没

有全面看文档导致的。

DEVELOPER.md 文档结尾如下：

Dependencies
====================
* Apache Kafka version 0.8.1.1
* jruby-kafka library

3）开始看 README.md 文档，特意看了下 kafka 的兼容性看来 logstas-input-kafka5.0.5 和 logstash-output-kafka5.0.4 只能用 kafka0.10 了。如果你想用 Kafka0.9 还想用 Logstash5.0, 你的

logstash-input-kafka 和 logstash-output-kafka 只能降级版本到 4.0.0 了，这里都说他是中间过渡版本了，所以还是随大流吧。

## Kafka Compatibility
Here’s a table that describes the compatibility matrix for Kafka Broker support. Please remember that it is good advice to upgrade brokers before consumers/producers
since brokers target backwards compatibility. The 0.9 broker will work with both the 0.8 consumer and 0.9 consumer APIs but not the other way around.
| Kafka Broker Version | Logstash Version | Input Plugin | Output Plugin | Why? |
|:—————:|:——————:|:————–:|:—————:|:——|
| 0.8 | 2.0 – 2.x | < 3.0.0 | <3.0.0 | Legacy, 0.8 is still popular |
| 0.9 | 2.0 – 2.3.x | 3.0.0 | 3.0.0 | Intermediate release before 0.10 that works with old Ruby Event API `[]` |
| 0.9 | 2.4, 5.0 | 4.0.0 | 4.0.0 | Intermediate release before 0.10 with new get/set API |
| 0.10 | 2.4, 5.0 | 5.0.0 | 5.0.0 | Track latest Kafka release. Not compatible with 0.9 broker |

4）现在看来只能升级 kafka 版本了。最后我看了下 jar-dependencies 发现了 kafka-clients-0.10.0.1.jar

ls /usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-kafka-5.0.5/vendor/jar-dependencies/runtime-jars/
kafka-clients-0.10.0.1.jar log4j-1.2.17.jar lz4-1.3.0.jar slf4j-api-1.7.21.jar slf4j-log4j12-1.7.21.jar snappy-java-1.1.2.6.jar

5）还有一个文件没有看，怀着好奇心我看了一眼，发现之前都白费力气了，这里才是最有参考价值的的主参考文档啊，是捷径啊，隐藏的够深的，差点错过了，汗！

/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-kafka-5.0.5/lib/logstash/inputs/kafka.rb

kafka.rb 部分文档如下：

# This input will read events from a Kafka topic. It uses the the newly designed
# 0.10 version of consumer API provided by Kafka to read messages from the broker.
#
# Here’s a compatibility matrix that shows the Kafka client versions that are compatible with each combination
# of Logstash and the Kafka input plugin:
#
# [options=”header”]
# |==========================================================
# |Kafka Client Version |Logstash Version |Plugin Version |Security Features |Why?
# |0.8 |2.0.0 – 2.x.x |<3.0.0 | |Legacy, 0.8 is still popular
# |0.9 |2.0.0 – 2.3.x | 3.x.x |Basic Auth, SSL |Works with the old Ruby Event API (`event[‘product’][‘price’] = 10`)
# |0.9 |2.4.0 – 5.0.x | 4.x.x |Basic Auth, SSL |Works with the new getter/setter APIs (`event.set(‘[product][price]’, 10)`)
# |0.10 |2.4.0 – 5.0.x | 5.x.x |Basic Auth, SSL |Not compatible with the 0.9 broker
# |==========================================================
#
# NOTE: We recommended that you use matching Kafka client and broker versions. During upgrades, you should
# upgrade brokers before clients because brokers target backwards compatibility. For example, the 0.9 broker
# is compatible with both the 0.8 consumer and 0.9 consumer APIs, but not the other way around.