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https://issues.apache.org/jira/browse/NIFI-2881?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15812505#comment-15812505
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ASF GitHub Bot commented on NIFI-2881:
--------------------------------------
GitHub user mattyb149 opened a pull request:
https://github.com/apache/nifi/pull/1407
NIFI-2881: Added EL support to DB Fetch processors, allow incoming
flowfiles to GenerateTableFetch
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You can merge this pull request into a Git repository by running:
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Alternatively you can review and apply these changes as the patch at:
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This closes #1407
----
commit a159feb8a1e753fbadab34b893f5f83f69cac730
Author: Matt Burgess <[email protected]>
Date: 2017-01-09T18:37:03Z
NIFI-2881: Added EL support to DB Fetch processors, allow incoming
flowfiles to GenerateTableFetch
----
> Allow Database Fetch processor(s) to accept incoming flow files and use
> Expression Language
> -------------------------------------------------------------------------------------------
>
> Key: NIFI-2881
> URL: https://issues.apache.org/jira/browse/NIFI-2881
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Extensions
> Reporter: Matt Burgess
> Assignee: Matt Burgess
>
> The QueryDatabaseTable and GenerateTableFetch processors do not allow
> Expression Language to be used in the properties, mainly because they also do
> not allow incoming connections. This means if the user desires to fetch from
> multiple tables, they currently need one instance of the processor for each
> table, and those table names must be hard-coded.
> To support the same capabilities for multiple tables and more flexible
> configuration via Expression Language, these processors should have
> properties that accept Expression Language, and GenerateTableFetch should
> accept (optional) incoming connections.
> Conversation about the behavior of the processors is welcomed and encouraged.
> For example, if an incoming flow file is available, do we also still run the
> incremental fetch logic for tables that aren't specified by this flow file,
> or do we just do incremental fetching when the processor is scheduled but
> there is no incoming flow file. The latter implies a denial-of-service could
> take place, by flooding the processor with flow files and not letting it do
> its original job of querying the table, keeping track of maximum values, etc.
> This is likely a breaking change to the processors because of how state
> management is implemented. Currently since the table name is hard coded, only
> the column name comprises the key in the state. This would have to be
> extended to have a compound key that represents table name, max-value column
> name, etc.
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