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From Joe Mészáros (JIRA) <j...@apache.org>
Subject [jira] [Created] (NIFI-989) Support size() operation in distributed map cache
Date Wed, 23 Sep 2015 15:24:04 GMT
Joe Mészáros created NIFI-989:
---------------------------------

             Summary: Support size() operation in distributed map cache
                 Key: NIFI-989
                 URL: https://issues.apache.org/jira/browse/NIFI-989
             Project: Apache NiFi
          Issue Type: Improvement
          Components: Core Framework
            Reporter: Joe Mészáros
            Priority: Minor


The distributed map cache server is a great tool for caching along with the cache client (DistributedMapCacheClientService),
but after you configure and enable it, it is a black box. You are unable to get any information
from the cache e.g how much entries live in the cache.

The purpose of this issue to extend the cache interface and associated implementations to
support the size() operation, which returns the number of 
entries in the distributed cache. 

It could be a first step in a direction of a more transparent cache, where the user can understand,
what happens with the distributed cache. I mean after the size() operation, it could be really
helpful to implement a stats() command, which s used to query the server about statistics
it
maintains and other internal data (e.g. evictions, hit rates, ...). 

Similar to:
 - memcached : https://docs.oracle.com/cd/E17952_01/refman-5.0-en/ha-memcached-stats-general.html
- couchbase: http://blog.couchbase.com/monitoring-couchbase-cluster
- redis: http://haydenjames.io/using-redis-stat-for-redis-statistics-tracking/


I implemented a really simple command line tool, which can interact with the cache server
from the command line, e.g. get a cache entry and it also able to get the size of the cache,
which could be useful, when you would like to debug cache related problems, or just get basic
interaction with the cache.





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