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https://issues.apache.org/jira/browse/KUDU-3516?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Song Jiacheng updated KUDU-3516:
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Summary: Tserver: Maintenance scheduler might be stuck in
DeltaStats#AddColumnIdsWithUpdates (was: Tserver: Maintenance scheduler might
stuck in DeltaStats#AddColumnIdsWithUpdates)
> Tserver: Maintenance scheduler might be stuck in
> DeltaStats#AddColumnIdsWithUpdates
> ------------------------------------------------------------------------------------
>
> Key: KUDU-3516
> URL: https://issues.apache.org/jira/browse/KUDU-3516
> Project: Kudu
> Issue Type: Bug
> Components: tserver
> Reporter: Song Jiacheng
> Priority: Major
> Attachments: image-2023-10-09-15-58-47-267.png,
> image-2023-10-09-15-59-01-026.png
>
>
> If we have many tables with many columns and each of them get many update
> requests, the maintenance scheduler will stuck in calculating the perf
> improvement score of major compaction.
> This tablet server has 6 maintenance manager but could only schedule 1 or 2
> tasks at one time, even if the tablet server is actually under high memory
> pressure.
> !image-2023-10-09-15-59-01-026.png|width=655,height=327!
> According to the stack showed below, I found out the scheduler stuck in
> AddColumnIdsWithUpdates for a long time, but there is no need to get all the
> updated columns here.
> !image-2023-10-09-15-58-47-267.png|width=690,height=218!
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