Shilun Fan created HDDS-11531:
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Summary: Collect iowait and system on the node.
Key: HDDS-11531
URL: https://issues.apache.org/jira/browse/HDDS-11531
Project: Apache Ozone
Issue Type: Sub-task
Components: Ozone Datanode
Reporter: Shilun Fan
Assignee: Shilun Fan
This feature will periodically retrieve data from /proc/stat, parse the iowait
and system information, and write it into metrics. In the future, we will
report this metric to SCM so that it can skip high-load DNs when returning the
pipeline DN list, decommison data transfers, creating pipelines, and balancing,
thereby enhancing the system's access performance.
Parsing `/proc/stat` is a lightweight action that won't impose additional load
on the system. This metric has good sensitivity to reflect the current IO
performance of the DN. High IOWait typically indicates conditions during
high-frequency read/write operations or when using `du` for HDD/SSD access. An
increase in System time usually occurs during high-frequency read/write
operations with NVMe. When these situations arise, the DN is no longer in
optimal condition for data access or writing (as responses will be very slow),
so we should find ways to skip such DNs during data access.
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