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https://issues.apache.org/jira/browse/NIFI-631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14649591#comment-14649591
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Joe Skora commented on NIFI-631:
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Looking through the HDFS processors, and others, I have a couple design
questions in the interest of getting things right the first time and not
developing bad habits.
1. If PropertyDescriptor and RelationShip values are all static final, is there
any resource or processing advantage/disadvantage to using static final
collections as well?
2. FetchHDFS creates a new collection for each getRelationships() or
getSupportedPropertyDescriptors() call, but AbstractHadoopProcessor creates
static final collections once and returns those. Is one style preferred over
the other? Is it just evolution in this case, or is there a reason these two
are not the same?
> Create ListFile and FetchFile processors
> ----------------------------------------
>
> Key: NIFI-631
> URL: https://issues.apache.org/jira/browse/NIFI-631
> Project: Apache NiFi
> Issue Type: Improvement
> Reporter: Mark Payne
>
> This pair of Processors will provide several benefits over the existing
> GetFile processor:
> 1. Currently, GetFile will continually pull the same files if the "Keep
> Source File" property is set to true. There is no way to pull the file and
> leave it in the directory without continually pulling the same file. We could
> implement state here, but it would either be a huge amount of state to
> remember everything pulled or it would have to always pull the oldest file
> first so that we can maintain just the Last Modified Date of the last file
> pulled plus all files with the same Last Modified Date that have already been
> pulled.
> 2. If pulling from a network attached storage such as NFS, this would allow a
> single processor to run ListFiles and then distribute those FlowFiles to the
> cluster so that the cluster can share the work of pulling the data.
> 3. There are use cases when we may want to pull a specific file (for example,
> in conjunction with ProcessHttpRequest/ProcessHttpResponse) rather than just
> pull all files in a directory. GetFile does not support this.
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