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https://issues.apache.org/jira/browse/NIFI-3627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15936855#comment-15936855
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ASF subversion and git services commented on NIFI-3627:
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Commit d1ebddce988da81737120de530a9c1bb28d1683d in nifi's branch
refs/heads/master from [~mattyb149]
[ https://git-wip-us.apache.org/repos/asf?p=nifi.git;h=d1ebddc ]
NIFI-3627: Added removeByPattern() to DistributedMapCache interfaces
NIFI-3627: Updated unit tests that use MapCache interface(s)
Signed-off-by: Pierre Villard <[email protected]>
This closes #1609.
> 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
>
> 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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