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From Joe Mészáros (JIRA) <j...@apache.org>
Subject [jira] [Commented] (NIFI-989) Support size() operation in distributed map cache
Date Thu, 24 Sep 2015 10:34:04 GMT

    [ 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:
-----------------------------------

>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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