Vladimir Pligin created IGNITE-27688:
----------------------------------------
Summary: Implement getPagesFillFactor metric
Key: IGNITE-27688
URL: https://issues.apache.org/jira/browse/IGNITE-27688
Project: Ignite
Issue Type: Improvement
Components: storage engines ai3
Reporter: Vladimir Pligin
h3. Background
In Apache Ignite 2, the {{getPagesFillFactor()}} method in
{{DataRegionMetrics}} provided a critical metric for monitoring memory
efficiency. This metric is missing in Apache Ignite 3 and needs to be
implemented to maintain feature parity and provide users with essential memory
monitoring capabilities.
h3. What is Page Fill Factor?
The page fill factor represents the *ratio of space occupied by user and system
data to the total size of all allocated pages* that contain this data. It is
expressed as a value between 0.0 and 1.0.
h3. Purpose and Use Cases
This metric helps determine:
# *Memory Efficiency* - How much of the allocated page memory is actually
being used for storing data versus being wasted as empty space within pages.
# *Fragmentation Detection* - A low fill factor indicates that data pages are
fragmented, meaning there is significant empty space distributed across pages
that cannot be reclaimed.
# *Capacity Planning* - Used to estimate actual data size.
# *Performance Tuning (and memory utilization)* - Low fill factor may indicate
the need for page size adjustment
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
