zjd-melo commented on issue #5263:
URL: 
https://github.com/apache/incubator-doris/issues/5263#issuecomment-763393721


   By remove the stdout part, this error happend.
   ```[2021-01-20T15:15:17,534][WARN ][logstash.outputs.doris][main] Failed to 
flush outgoing items 
   {:outgoing_count=>1, :exception=>"TypeError", 
:backtrace=>["org/jruby/RubyString.java:2684:in `<<'", 
   
"/logstash-7.4.2/vendor/local_gems/b61803dd/logstash-output-doris-0.1.0/lib/logstash/outputs/doris.rb:179:in
 `block in flush'", 
   "org/jruby/RubyArray.java:1800:in `each'", 
   
"/logstash-7.4.2/vendor/local_gems/b61803dd/logstash-output-doris-0.1.0/lib/logstash/outputs/doris.rb:178:in
 `flush'", 
   
"/logstash-7.4.2/vendor/bundle/jruby/2.5.0/gems/stud-0.0.23/lib/stud/buffer.rb:219:in
 `block in buffer_flush'", 
   "org/jruby/RubyHash.java:1417:in `each'", 
   
"/logstash-7.4.2/vendor/bundle/jruby/2.5.0/gems/stud-0.0.23/lib/stud/buffer.rb:216:in
 `buffer_flush'", 
   
"/logstash-7.4.2/vendor/bundle/jruby/2.5.0/gems/stud-0.0.23/lib/stud/buffer.rb:112:in
 `block in buffer_initialize'", 
   "org/jruby/RubyKernel.java:1425:in `loop'", 
   
"/logstash-7.4.2/vendor/bundle/jruby/2.5.0/gems/stud-0.0.23/lib/stud/buffer.rb:110:in
 `block in buffer_initialize'"]}```


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