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https://issues.apache.org/jira/browse/NIFI-989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14906178#comment-14906178
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Joe Mészáros commented on NIFI-989:
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>From client perspective, I created an ExtendedDistributedMapCacheClient
>interface, which is the super interface of DistributedMapCacheClient. I choose
>this name, instead of SizableDistributedMapCacheClient, because it gives us
>more space. In the future we can add a new method, e.g. stat() to the new
>interface, without change the interface name, and do not rename it
>SizableDistributedMapCacheClientWithStats.
> 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
> Labels: cache, command-line, distributed, improvement
>
> 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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