hdfs - Scenarios possible in apache nifi -


i trying understand apache nifi in , out keeping files in hdfs , have various scenarios work on. please let me know feasibility of each explanations. adding few understanding each scenario.

  1. can check null value present in single column? have checked different processors, , found notnull property, think works on file names, not on columns present within file.
  2. can drop column present in hdfs using nifi transformations?
  3. can change column values in replace 1 text other? have checked replacetext property same.
  4. can delete row file system?

please suggest possibilities , how achieve goal.

try this:

1.can check null value present in single column? have checked different : yes using replace text processor can check , replace if want replace or use 'route on attribute' if want route based on null value condition.

  1. can drop column present in hdfs using nifi transformations? yes using same 'replacetext' processor can put desired fields delimiter used have current date field , mandatory fields in data comma separated provided replacement value

"${'userid'}","${'appid'}","${sitename}","${now():format("yyyy-mm-dd")}"

  1. to change column value use 'replacetext' processor.

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