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https://issues.apache.org/jira/browse/HDDS-11531?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HDDS-11531:
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Labels: pull-request-available (was: )
> 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
> Priority: Major
> Labels: pull-request-available
>
> 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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