[jira] [Created] (KUDU-3516) Tserver: Maintenance scheduler might stuck in DeltaStats#AddColumnIdsWithUpdates

["Song Jiacheng (Jira)" <ji...@apache.org>]

Song Jiacheng created KUDU-3516:
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             Summary:  Tserver: Maintenance scheduler might 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
         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 calculate 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!

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!



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