[jira] [Created] (NIFI-3627) Add ability to remove distributed map cache entries according to a regular expression

["Matt Burgess (JIRA)" <ji...@apache.org>]

Matt Burgess created NIFI-3627:
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             Summary: 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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