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From "Andy LoPresto (JIRA)" <j...@apache.org>
Subject [jira] [Created] (NIFI-5566) Bring HashContent inline with HashService and rename legacy components
Date Sat, 01 Sep 2018 00:14:00 GMT
Andy LoPresto created NIFI-5566:
-----------------------------------

             Summary: Bring HashContent inline with HashService and rename legacy components
                 Key: NIFI-5566
                 URL: https://issues.apache.org/jira/browse/NIFI-5566
             Project: Apache NiFi
          Issue Type: Improvement
          Components: Extensions
    Affects Versions: 1.7.1
            Reporter: Andy LoPresto
            Assignee: Andy LoPresto


As documented in [NIFI-5147|https://issues.apache.org/jira/browse/NIFI-5147] and [PR 2980|https://github.com/apache/nifi/pull/2980],
the {{HashAttribute}} processor and {{HashContent}} processor are lacking some features, do
not offer consistent algorithms across platforms, etc. 

I propose the following:
* Rename {{HashAttribute}} (which does not provide the service of calculating a hash over
one or more attributes) to {{HashAttributeLegacy}}
* Renamed {{CalculateAttributeHash}} to {{HashAttribute}} to make semantic sense
* Rename {{HashContent}} to {{HashContentLegacy}} for users who need obscure digest algorithms
which may or may not have been offered on their platform
* Implement a processor {{HashContent}} with similar semantics to the existing processor but
with consistent algorithm offerings and using the common {{HashService}} offering

With the new component versioning features provided as part of the flow versioning behavior,
silently disrupting existing flows which use these processors is no longer a concern. Rather,
Any flow currently using the existing processors will either:

1. continue normal operation
1. require flow manager interaction and provide documentation about the change
  1. migration notes and upgrade instructions will be provided



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