Yukang-Lian opened a new pull request, #50432:
URL: https://github.com/apache/doris/pull/50432
Pick #49882
Background:
In cloud mode, compaction tasks for the same tablet may be scheduled across
multiple BEs. To ensure that only one BE can execute a compaction task for a
given tablet at a time, a global locking mechanism is used.
During compaction preparation, tablet and compaction information is written
as key-value pairs to the metadata service. A background thread periodically
renews the lease. Other BEs can only perform compaction on a tablet when the KV
entry has expired or doesn't exist, ensuring that a tablet's compaction occurs
on only one BE at a time.
Problem:
Compaction tasks are processed through a thread pool. Currently, we first
prepare compaction and acquire the global lock before queueing the task. If a
BE is under heavy compaction pressure with all threads occupied, tablets may
wait in the queue for extended periods. Meanwhile, other idle BEs cannot
perform compaction on these tablets because they cannot acquire the global
lock, leading to resource imbalance with some BEs starved and others overloaded.
Solution:
To address this issue, we'll modify the workflow to queue tasks first, then
attempt to acquire the lock only when the task is about to be executed. This
ensures that even if a tablet's compaction task is queued on one BE, another
idle BE can still perform compaction on that tablet, resulting in better
resource utilization across the cluster.
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [ ] Unit Test
- [ ] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [ ] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [ ] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR should
merge into -->
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