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https://issues.apache.org/jira/browse/NIFI-4658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16402019#comment-16402019
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Brandon DeVries commented on NIFI-4658:
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So, first, it sounds like "Maximum Number of Entries" should be marked as
required, since that's effectively the behavior. The lack of that explicit
statement is probably the cause of a lot of the confusion.
Second, the real issue here for defragmentation seems to be the lack of
communication as to what is happening / why a FlowFile fails. If "Maximum
Number of Entries" is going to be required / enforced even in defragmentation
mode, then the easiest thing to do is immediately fail anything incoming with a
fragment.count greater than that value, with an accompanying warning indicating
why the file failed ("fragment.count is greater than Maximum number of
entries... defragmentation cannot succeed as configured"). We can probably use
a FlowFileFilter to get and fail all of the offending files in queue whenever
one is encountered during normal processing, to limit the number of warnings.
I'm still not 100% on board with the use of "Maximum Number of Entries" for
defragmentation, but as long as what is happening is made clear it can be
worked around...
> MergeContent Max Number of Entries resetting to default value
> -------------------------------------------------------------
>
> Key: NIFI-4658
> URL: https://issues.apache.org/jira/browse/NIFI-4658
> Project: Apache NiFi
> Issue Type: Bug
> Affects Versions: 1.4.0
> Reporter: Brian Ghigiarelli
> Priority: Major
>
> Prior to and including 1.4.0, the MergeContent processor supports a property
> called "Maximum Number of Entries". It has a default value of 1,000. Prior to
> 1.4.0 and in the description of this property, if the property is not set,
> there will be no maximum number of files to include in a bundle.
> However, with the release of 1.4.0, if you clear the value of this property
> in order to have an unlimited number of files in the bundle and "Apply" the
> change, the next time that you open the configuration of the processor, it
> will again be set to the default value of 1,000. The expectation is that the
> cleared value will remain cleared, maintaining a configuration for an
> unlimited number of files in a merge bundle.
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