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https://issues.apache.org/jira/browse/NIFI-3627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15935441#comment-15935441
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ASF GitHub Bot commented on NIFI-3627:
--------------------------------------
GitHub user mattyb149 opened a pull request:
https://github.com/apache/nifi/pull/1609
NIFI-3627: Added removeByPattern() to DistributedMapCache interfaces
Also removed old conditions preventing the tests from running on OS X with
Java 8.
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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 #1609
----
commit c897b9880e08b13a064c00dde4c91e489335309d
Author: Matt Burgess <[email protected]>
Date: 2017-03-21T22:15:54Z
NIFI-3627: Added removeByPattern() to DistributedMapCache interfaces
----
> 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
>
> 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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