Joe Mészáros created NIFI-989:
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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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