curl -H "Content-Type: application/json" -X POST \
  -d '{"loggers":[{"target":"com.datatorrent.lib.io.fs.AbstractFileOutputOperator","logLevel":"WARN"}]}' \
  http://apex-sandbox:39809/ws/v2/stram/loggers/

  
2017-03-23 14:59:06,726 INFO com.datatorrent.lib.io.fs.AbstractFileOutputOperator: opened wordcountresult_4.6, active /tmp/wordcount-result/wordcountresult_4.6
2017-03-23 15:00:29,714 INFO com.datatorrent.lib.io.fs.AbstractFileOutputOperator: closing wordcountresult_4.6
2017-03-23 15:00:30,231 INFO com.datatorrent.lib.io.fs.AbstractFileOutputOperator: opened wordcountresult_4.7, active /tmp/wordcount-result/wordcountresult_4.7
2017-03-23 15:01:42,430 INFO com.datatorrent.stram.util.LoggerUtil: changing level of com.datatorrent.lib.io.fs.AbstractFileOutputOperator to WARN
2017-03-23 15:10:14,979 INFO com.datatorrent.stram.util.LoggerUtil: changing level of com.datatorrent.lib.io.fs.AbstractFileOutputOperator to DEBUG
2017-03-23 15:10:28,220 DEBUG com.datatorrent.lib.io.fs.AbstractFileOutputOperator: Rotating file wordcountresult_4 14 501
2017-03-23 15:10:28,220 DEBUG com.datatorrent.lib.io.fs.AbstractFileOutputOperator: request finalize wordcountresult_4.14
2017-03-23 15:10:28,220 INFO com.datatorrent.lib.io.fs.AbstractFileOutputOperator: closing wordcountresult_4.14
2017-03-23 15:10:28,238 DEBUG com.datatorrent.lib.io.fs.AbstractFileOutputOperator: Part file rotated wordcountresult_4 : 14
  