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Posted to commits@druid.apache.org by "aruraghuwanshi (via GitHub)" <gi...@apache.org> on 2024/05/10 21:48:16 UTC
[I] Segment Load Queue does not refresh for individual historicals untill all loadqueues have finished loading segments (druid)
aruraghuwanshi opened a new issue, #16433:
URL: https://github.com/apache/druid/issues/16433
Please provide a detailed title (e.g. "Broker crashes when using TopN query with Bound filter" instead of just "Broker crashes").
### Affected Version
Version 28.0.1
(Unsure if it exists in earlier versions)
### Description
Coordinator leader does not assign new Segment Load Queues until all historicals have finished ingesting the segments from their previous assignments.
Scenario:
- In a cluster size of **M** historicals, a large volume of segments (upwards of 8Tb) need to be decommissioned off of **n** historicals.
- The coordinator then assigns load queues to all the other remaining **M-n** historicals.
- The first historical finishes loading its segment queue in time **t**, while the historical that finishes last finishes loading in time **T**.
- All historicals (_including the ones that have already finished their segment loading_) do not get new segment load queue assignments until the last historical has finished loading the segments in its queue.
- The issue comes up when the segment load queues are so large on the pending historicals that the historicals that have completed their segment loading will have to wait for a considerably long time ( **T-t** ), before getting new segment load queues.
In the following example, this time exceeded 2+ hours, even when there were more segments left to be decommissioned after the seen load queue had finished execution.
Services tab:
decommission list:
Coordinator dynamic config:
<img width="492" alt="coordinator_dynamic_config" src="https://github.com/apache/druid/assets/35107623/9af4ebfe-3ae7-4591-a821-9230e15c6914">
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Re: [I] Segment Load Queue does not refresh for individual historicals untill all loadqueues have finished loading segments (druid)
Posted by "kfaraz (via GitHub)" <gi...@apache.org>.
kfaraz commented on issue #16433:
URL: https://github.com/apache/druid/issues/16433#issuecomment-2726179840
@aruraghuwanshi , the historicals that have finished loading do get assigned new segments while others are busy loading.
You can verify this by looking at the metric `segment/loadQueue/assigned` by dimension `server`.
But the segments which are already loading on the slow server will most likely still have to finish loading there (due to segment balancing requirements).
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Re: [I] Segment Load Queue does not refresh for individual historicals untill all loadqueues have finished loading segments (druid)
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on issue #16433:
URL: https://github.com/apache/druid/issues/16433#issuecomment-2726052068
This issue has been closed due to lack of activity. If you think that
is incorrect, or the issue requires additional review, you can revive the issue at
any time.
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Re: [I] Segment Load Queue does not refresh for individual historicals untill all loadqueues have finished loading segments (druid)
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on issue #16433:
URL: https://github.com/apache/druid/issues/16433#issuecomment-2660561230
This issue has been marked as stale due to 280 days of inactivity.
It will be closed in 4 weeks if no further activity occurs. If this issue is still
relevant, please simply write any comment. Even if closed, you can still revive the
issue at any time or discuss it on the dev@druid.apache.org list.
Thank you for your contributions.
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Re: [I] Segment Load Queue does not refresh for individual historicals untill all loadqueues have finished loading segments (druid)
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] closed issue #16433: Segment Load Queue does not refresh for individual historicals untill all loadqueues have finished loading segments
URL: https://github.com/apache/druid/issues/16433
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