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https://issues.apache.org/jira/browse/NIFI-1081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14980564#comment-14980564
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Charlie Frasure commented on NIFI-1081:
---------------------------------------
Joe,
This patch compiled and executes without error. I was able to capture the
command results in an attribute, but the attribute wasn't "sticky" to the next
processor. I tried explicitly defining the attribute with UpdateAttribute
prior to ExecuteStream, but then the attribute had the initial value at the end
of the flow as if the scope of the attribute was local to ExecuteStreamCommand.
GetFile ->
UpdateAttribute (set encoding) -> 'none'
ExecuteStreamCommand (send results to encoding) -> 'utf8'
LogAttribute (encoding) -> 'none'
> Add option to ExecuteStreamCommand to put value of execution to an attribute
> ----------------------------------------------------------------------------
>
> Key: NIFI-1081
> URL: https://issues.apache.org/jira/browse/NIFI-1081
> Project: Apache NiFi
> Issue Type: Test
> Reporter: Joseph Percivall
> Assignee: Joseph Percivall
> Priority: Minor
> Attachments: NIFI-1081.patch
>
>
> This issue arose from a user on the mailing list. It demonstrates the need to
> be able to put the output of ExecuteStreamCommand to an attribute:
> I'm looking to process many files into common formats. The source files are
> coming in various character sets, mime types, and new line terminators.
> My thinking for a data flow was along these lines:
> GetFile (from many sub directories) ->
> ExecuteStreamCommand (file -i) ->
> ConvertCharacterSet (from previous command to utf8) ->
> ReplaceText (to change any \r\n into \n) ->
> PutFile (into a directory structure based on values found in the original
> file path and filename)
> Additional steps would be added for archiving a copy of the original,
> converting xml files, etc.
> Attempting to process these with Nifi leaves me confused as to how to process
> within the tool. If I want to ConvertCharacterSet, I have to know the input
> type. I setup a ExecuteStreamCommand to file -i
> ${absolute.path:append(${filename})} which returned the expected values. I
> don't see a way to turn these results into input for the processor, which
> doesn't accept expression language for that field.
> I also considered ConvertCSVToAvro as an interim step but notice the same
> issue. Any suggestions what this dataflow should look like?
> Bryan Bende's response:
> One problem with the above flow is that ExecuteStreamCommand will replace the
> contents of the FlowFile with the results of the command, so the FlowFIle
> will have the encoding value and no longer have the original content.
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