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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NIFI-989) Support size() operation in distributed map cache
Date Thu, 24 Sep 2015 10:31:04 GMT

    [ https://issues.apache.org/jira/browse/NIFI-989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14906175#comment-14906175
] 

ASF GitHub Bot commented on NIFI-989:
-------------------------------------

GitHub user joemeszaros opened a pull request:

    https://github.com/apache/nifi/pull/94

    NIFI-989: Support size() operation in distributed map cache

    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 PR to create an extended 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.


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/ImpressTV/nifi NIFI-989

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/nifi/pull/94.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #94
    
----
commit 5a8578a70db1b9c61d26bbd06132ee035929378f
Author: Joe <joe.meszaros@impresstv.com>
Date:   2015-09-24T10:26:42Z

    NIFI-989: Support size() operation in distributed map cache

----


> 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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