记录一次 logstash 6.5.4使用webhdfs插件向hdfs导入数据错误：
[WARN ][logstash.outputs.webhdfs ] Failed to flush outgoing items {:outgoing_count=>1, :exception=>"LogStash::Error",
:backtrace=>[
"org/logstash/ext/JrubyEventExtLibrary.java:177:in `sprintf'",
"/export/logstash-6.5.4/vendor/bundle/jruby/2.3.0/gems/logstash-output-webhdfs-3.0.6/lib/logstash/outputs/webhdfs.rb:194:in `block in flush'",
"org/jruby/RubyArray.java:2481:in `collect'",
"/export/logstash-6.5.4/vendor/bundle/jruby/2.3.0/gems/logstash-output-webhdfs-3.0.6/lib/logstash/outputs/webhdfs.rb:189:in `flush'",
"/export/logstash-6.5.4/vendor/bundle/jruby/2.3.0/gems/stud-0.0.23/lib/stud/buffer.rb:219:in `block in buffer_flush'",
"org/jruby/RubyHash.java:1343:in `each'",
"/export/logstash-6.5.4/vendor/bundle/jruby/2.3.0/gems/stud-0.0.23/lib/stud/buffer.rb:216:in `buffer_flush'",
"/export/logstash-6.5.4/vendor/bundle/jruby/2.3.0/gems/stud-0.0.23/lib/stud/buffer.rb:159:in `buffer_receive'",
"/export/logstash-6.5.4/vendor/bundle/jruby/2.3.0/gems/logstash-output-webhdfs-3.0.6/lib/logstash/outputs/webhdfs.rb:182:in `receive'",
"/export/logstash-6.5.4/logstash-core/lib/logstash/outputs/base.rb:89:in `block in multi_receive'",
"org/jruby/RubyArray.java:1734:in `each'",
"/export/logstash-6.5.4/logstash-core/lib/logstash/outputs/base.rb:89:in `multi_receive'",
"org/logstash/config/ir/compiler/OutputStrategyExt.java:114:in `multi_receive'",
"org/logstash/config/ir/compiler/AbstractOutputDelegatorExt.java:97:in `multi_receive'",
"/export/logstash-6.5.4/logstash-core/lib/logstash/pipeline.rb:373:in `block in output_batch'",
"org/jruby/RubyHash.java:1343:in `each'", "/export/logstash-6.5.4/logstash-core/lib/logstash/pipeline.rb:372:in `output_batch'",
"/export/logstash-6.5.4/logstash-core/lib/logstash/pipeline.rb:324:in `worker_loop'",
"/export/logstash-6.5.4/logstash-core/lib/logstash/pipeline.rb:286:in `block in start_workers'"]}
经过分析：
是webhdfs使用不当的原因在官网里的推荐配置是这样
而我没有完全按照该格式
解决方法：
- path最终我替换成了/user/ogstash/logs/output.txt加上dt=
