Alessandro D'Armiento created NIFI-6462:
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Summary: ListHDFS should be triggerable
Key: NIFI-6462
URL: https://issues.apache.org/jira/browse/NIFI-6462
Project: Apache NiFi
Issue Type: Improvement
Components: Core Framework
Affects Versions: 1.9.2
Reporter: Alessandro D'Armiento
h2. Current Situation
ListHDFS is designed to be (only) the entry point of a data integration
pipeline, and therefore can only be triggered on a cron or time base.
h2. Improvement Proposal
ListHDFS should be able to be used as part of your pipeline even if you do not
expect to have it as the entry point. To obtain it:
* It has to be triggerable
* Trigger flowfile should be able to bring the listing directory as an attribute
* Some logic, such as the "skip the last file in the listing directory" should
be made optional
* Since the processor will work on a 1:N semantic (1 input trigger flowfile, N
output flowfiles) it would be nice to support fragmentation attributes (for
example for subsequent merge operations)
* It would be also useful to support different fragmentation strategies, in
order to support multiple user cases. For example, it should be possible to
select:
* A "one for all" fragmentation strategy which will create a single
fragmentation group. Therefore, all files will have the same
fragment.identifier, the same fragment.count, equal to the total number N of
listed files, and fragment.index ∈ [0, N).
* A "per subdir" fragmentation strategy which will create different
fragmentation groups, one for each scanned subdirectory of the given path.
Therefore, for each subfolder, flowfiles will have a specific
fragment.identifier, fragment.count will be, for each flowfile, equal to the
number Ni of files in the i-th directory, and fragment.index ∈ [0, Ni).
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