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https://issues.apache.org/jira/browse/NIFI-3627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16169618#comment-16169618
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Minmin DU commented on NIFI-3627:
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Hi there,
I think it is good to explore this method to a NiFi processor so that it
provides flexibility for end user to remove a signal manually. It will be
greatly useful from operation prospective. In our project, we had to create a
custom NiFi processor to call this method specifically.
In addition, I noticed that all entries in distribute map cache will be gone
after restarting NiFi. Is there any way to persist the cache to a disk in case
NiFi is down ?
Thanks a lot.
Cheers,
Minmin
> Add ability to remove distributed map cache entries according to a regular
> expression
> -------------------------------------------------------------------------------------
>
> Key: NIFI-3627
> URL: https://issues.apache.org/jira/browse/NIFI-3627
> Project: Apache NiFi
> Issue Type: Improvement
> Reporter: Matt Burgess
> Assignee: Matt Burgess
> Fix For: 1.2.0
>
>
> The DistributedMapCacheClient interface has the ability to remove an
> individual entry based on a specified key. For large numbers of key/value
> pairs, this becomes unwieldy as a processor using this would have to keep
> track of all the keys it has stored, thereby lessening the effectiveness of
> the cache.
> Alternatively, I propose a method be added that will remove keys based on a
> regular expression (regex) pattern; this way a processor could prefix a value
> to each key (such as the UUID of the processor itself), and remove all such
> keys when it deems prudent. The method could be as simple as:
> void remove(String pattern)
> or perhaps it could return boolean (true if any key was deleted, false
> otherwise) or an int (the number of deleted keys)
> Note that in order to match the pattern, the key Serializer used must
> generate keys that the regex can match.
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