排查logstash2.4升级到5.0版本后kafka不兼容问题
排查logstash2.4升级到5.0版本后kafka不兼容问题参考文档：
/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://jerrymin.blog.运维网.com/3002256/1870205，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：
Unknown setting 'zk_connect' for kafka
Unknown setting 'topic_id' for 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 |
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