[fix](be) Keep workload group paused queries blocked when reserve still fails by mrhhsg · Pull Request #62285 · apache/doris

mrhhsg · 2026-04-09T09:31:15Z

What problem does this PR solve?

Issue Number: None

Related PR: None

Problem Summary: Keep queries paused after WORKLOAD_GROUP_MEMORY_EXCEEDED when retrying the same reserve would still exceed the workload group high watermark, and add a manager unit test that exercises a real reserve failure path.

Release note

None

Check List (For Author)

Test: Unit Test
- Incrementally compiled , , and
- Full was not completed because linking triggers a large incremental rebuild in this worktree
Behavior changed: Yes (queries that still cannot satisfy the same workload group reserve stay paused instead of being resumed immediately)
Does this need documentation: No

What problem does this PR solve?

Issue Number: close #xxx

Related PR: #xxx

Problem Summary:

Release note

None

Check List (For Author)

Test
- 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
Behavior changed:
- No.
- Yes.
Does this need documentation?
- No.
- Yes.

Check List (For Reviewer who merge this PR)

Confirm the release note
Confirm test cases
Confirm document
Add branch pick label

hello-stephen · 2026-04-09T09:31:21Z

Thank you for your contribution to Apache Doris.
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Please clearly describe your PR:

What problem was fixed (it's best to include specific error reporting information). How it was fixed.
Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
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Copilot

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

This PR updates workload-group paused query handling so that queries paused due to WORKLOAD_GROUP_MEMORY_EXCEEDED remain paused when retrying the same reserve would still exceed the workload group high watermark, and adds a unit test that exercises a real reserve failure path.

Changes:

Update WorkloadGroupMgr::handle_single_query_ to re-check high watermark including the requested reserve size before resuming a paused query.
Extend WorkloadGroup::check_mem_used to optionally account for a prospective reserve size.
Add a new unit test that triggers a real try_reserve failure and verifies the query remains paused.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
be/test/runtime/workload_group/workload_group_manager_test.cpp	Adds a reserve-failure test and parameterizes helpers to cover the “keep paused” behavior.
be/src/runtime/workload_group/workload_group_manager.cpp	Changes resume/keep-paused decision logic for `WORKLOAD_GROUP_MEMORY_EXCEEDED` using high watermark checks.
be/src/runtime/workload_group/workload_group.h	Adds an overload to include reserved bytes in watermark checks.

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Copilot · 2026-04-09T09:39:38Z

be/test/runtime/workload_group/workload_group_manager_test.cpp

        CountDownLatch latch(1);
-        size_t check_times = 300;
-        while (--check_times > 0) {
+        while (check_times-- > 0) {


while (check_times-- > 0) causes an unsigned underflow when check_times is 0 (the value wraps even though the loop body won’t run). Consider rewriting to avoid wraparound (e.g., while (check_times > 0) { --check_times; ... } or a for loop) to keep the intent clearer and avoid surprising state changes.

Suggested change

while (check_times-- > 0) {

while (check_times > 0) {

--check_times;

Copilot · 2026-04-09T09:39:38Z

be/test/runtime/workload_group/workload_group_manager_test.cpp

+    auto st = thread_context.thread_mem_tracker_mgr->try_reserve(2048);
+    ASSERT_TRUE(st.ok()) << st.to_string();
+    ASSERT_EQ(query_context->resource_ctx()->memory_context()->current_memory_bytes(), 2048);
+    ASSERT_EQ(query_context->resource_ctx()->memory_context()->reserved_consumption(), 2048);
+    ASSERT_LT(query_context->resource_ctx()->memory_context()->current_memory_bytes(),
+              query_context->resource_ctx()->memory_context()->mem_limit());
+    ASSERT_LT(query_context->resource_ctx()->memory_context()->current_memory_bytes() + 1024,
+              query_context->resource_ctx()->memory_context()->mem_limit());
+
+    bool exceed_low_watermark = false;
+    bool exceed_high_watermark = false;
+    wg->check_mem_used(&exceed_low_watermark, &exceed_high_watermark);
+    ASSERT_FALSE(exceed_low_watermark);
+    ASSERT_FALSE(exceed_high_watermark);
+
+    st = thread_context.thread_mem_tracker_mgr->try_reserve(1024);
+    ASSERT_TRUE(st.is<ErrorCode::WORKLOAD_GROUP_MEMORY_EXCEEDED>()) << st.to_string();
+    ASSERT_FALSE(st.is<ErrorCode::QUERY_MEMORY_EXCEEDED>()) << st.to_string();
+    ASSERT_EQ(query_context->resource_ctx()->memory_context()->current_memory_bytes(), 2048);
+    ASSERT_EQ(query_context->resource_ctx()->memory_context()->reserved_consumption(), 2048);
+
+    _wg_manager->add_paused_query(query_context->resource_ctx(), 1024, st);
+    ASSERT_FALSE(query_context->get_memory_sufficient_dependency()->ready());
+    {
+        std::unique_lock<std::mutex> lock(_wg_manager->_paused_queries_lock);
+        ASSERT_EQ(_wg_manager->_paused_queries_list[wg].size(), 1)
+                << "paused queue should not be empty";
+    }
+
+    _run_checking_loop(wg, 3);
+
+    ASSERT_FALSE(query_context->get_memory_sufficient_dependency()->ready());
+    ASSERT_TRUE(
+            query_context->resource_ctx()->task_controller()->paused_reason().is<
+                    ErrorCode::WORKLOAD_GROUP_MEMORY_EXCEEDED>());
+    ASSERT_FALSE(query_context->is_cancelled());
+    {
+        std::unique_lock<std::mutex> lock(_wg_manager->_paused_queries_lock);
+        ASSERT_EQ(_wg_manager->_paused_queries_list[wg].size(), 1)
+                << "paused queue should keep the query";
+    }
+
+    {
+        std::unique_lock<std::mutex> lock(_wg_manager->_paused_queries_lock);
+        _wg_manager->_paused_queries_list.erase(wg);
+    }
+    query_context->set_memory_sufficient(true);
+    thread_context.thread_mem_tracker_mgr->shrink_reserved();
+    thread_context.detach_task();


This test mutates _paused_queries_list directly for cleanup and relies on reaching the bottom of the test to call shrink_reserved() / detach_task(). Any earlier ASSERT_* failure will skip this cleanup and can leak paused-query state and thread attachment into subsequent tests, causing order-dependent failures. Prefer a scope guard/RAII cleanup (or a test-only helper API on the manager) so _paused_queries_list cleanup and detach_task() always happen.

Suggested change

auto st = thread_context.thread_mem_tracker_mgr->try_reserve(2048);

ASSERT_TRUE(st.ok()) << st.to_string();

ASSERT_EQ(query_context->resource_ctx()->memory_context()->current_memory_bytes(), 2048);

ASSERT_EQ(query_context->resource_ctx()->memory_context()->reserved_consumption(), 2048);

ASSERT_LT(query_context->resource_ctx()->memory_context()->current_memory_bytes(),

query_context->resource_ctx()->memory_context()->mem_limit());

ASSERT_LT(query_context->resource_ctx()->memory_context()->current_memory_bytes() + 1024,

query_context->resource_ctx()->memory_context()->mem_limit());

bool exceed_low_watermark = false;

bool exceed_high_watermark = false;

wg->check_mem_used(&exceed_low_watermark, &exceed_high_watermark);

ASSERT_FALSE(exceed_low_watermark);

ASSERT_FALSE(exceed_high_watermark);

st = thread_context.thread_mem_tracker_mgr->try_reserve(1024);

ASSERT_TRUE(st.is<ErrorCode::WORKLOAD_GROUP_MEMORY_EXCEEDED>()) << st.to_string();

ASSERT_FALSE(st.is<ErrorCode::QUERY_MEMORY_EXCEEDED>()) << st.to_string();

ASSERT_EQ(query_context->resource_ctx()->memory_context()->current_memory_bytes(), 2048);

ASSERT_EQ(query_context->resource_ctx()->memory_context()->reserved_consumption(), 2048);

_wg_manager->add_paused_query(query_context->resource_ctx(), 1024, st);

ASSERT_FALSE(query_context->get_memory_sufficient_dependency()->ready());

{

std::unique_lock<std::mutex> lock(_wg_manager->_paused_queries_lock);

ASSERT_EQ(_wg_manager->_paused_queries_list[wg].size(), 1)

<< "paused queue should not be empty";

}

_run_checking_loop(wg, 3);

ASSERT_FALSE(query_context->get_memory_sufficient_dependency()->ready());

ASSERT_TRUE(

query_context->resource_ctx()->task_controller()->paused_reason().is<

ErrorCode::WORKLOAD_GROUP_MEMORY_EXCEEDED>());

ASSERT_FALSE(query_context->is_cancelled());

{

std::unique_lock<std::mutex> lock(_wg_manager->_paused_queries_lock);

ASSERT_EQ(_wg_manager->_paused_queries_list[wg].size(), 1)

<< "paused queue should keep the query";

}

{

std::unique_lock<std::mutex> lock(_wg_manager->_paused_queries_lock);

_wg_manager->_paused_queries_list.erase(wg);

}

query_context->set_memory_sufficient(true);

thread_context.thread_mem_tracker_mgr->shrink_reserved();

thread_context.detach_task();

{

using WorkloadGroupPtr = decltype(wg);

using QueryContextPtr = decltype(query_context);

struct ScopedTestCleanup {

WorkloadGroupMgr* wg_manager;

WorkloadGroupPtr workload_group;

QueryContextPtr query_ctx;

ThreadContext& thread_ctx;

~ScopedTestCleanup() {

{

std::unique_lock<std::mutex> lock(wg_manager->_paused_queries_lock);

wg_manager->_paused_queries_list.erase(workload_group);

}

query_ctx->set_memory_sufficient(true);

thread_ctx.thread_mem_tracker_mgr->shrink_reserved();

thread_ctx.detach_task();

}

} cleanup {_wg_manager.get(), wg, query_context, thread_context};

auto st = thread_context.thread_mem_tracker_mgr->try_reserve(2048);

ASSERT_TRUE(st.ok()) << st.to_string();

ASSERT_EQ(query_context->resource_ctx()->memory_context()->current_memory_bytes(), 2048);

ASSERT_EQ(query_context->resource_ctx()->memory_context()->reserved_consumption(), 2048);

ASSERT_LT(query_context->resource_ctx()->memory_context()->current_memory_bytes(),

query_context->resource_ctx()->memory_context()->mem_limit());

ASSERT_LT(query_context->resource_ctx()->memory_context()->current_memory_bytes() + 1024,

query_context->resource_ctx()->memory_context()->mem_limit());

bool exceed_low_watermark = false;

bool exceed_high_watermark = false;

wg->check_mem_used(&exceed_low_watermark, &exceed_high_watermark);

ASSERT_FALSE(exceed_low_watermark);

ASSERT_FALSE(exceed_high_watermark);

st = thread_context.thread_mem_tracker_mgr->try_reserve(1024);

ASSERT_TRUE(st.is<ErrorCode::WORKLOAD_GROUP_MEMORY_EXCEEDED>()) << st.to_string();

ASSERT_FALSE(st.is<ErrorCode::QUERY_MEMORY_EXCEEDED>()) << st.to_string();

ASSERT_EQ(query_context->resource_ctx()->memory_context()->current_memory_bytes(), 2048);

ASSERT_EQ(query_context->resource_ctx()->memory_context()->reserved_consumption(), 2048);

_wg_manager->add_paused_query(query_context->resource_ctx(), 1024, st);

ASSERT_FALSE(query_context->get_memory_sufficient_dependency()->ready());

{

std::unique_lock<std::mutex> lock(_wg_manager->_paused_queries_lock);

ASSERT_EQ(_wg_manager->_paused_queries_list[wg].size(), 1)

<< "paused queue should not be empty";

}

_run_checking_loop(wg, 3);

ASSERT_FALSE(query_context->get_memory_sufficient_dependency()->ready());

ASSERT_TRUE(

query_context->resource_ctx()->task_controller()->paused_reason().is<

ErrorCode::WORKLOAD_GROUP_MEMORY_EXCEEDED>());

ASSERT_FALSE(query_context->is_cancelled());

{

std::unique_lock<std::mutex> lock(_wg_manager->_paused_queries_lock);

ASSERT_EQ(_wg_manager->_paused_queries_list[wg].size(), 1)

<< "paused queue should keep the query";

}

}

Copilot · 2026-04-09T09:39:39Z

be/src/runtime/workload_group/workload_group_manager.cpp

+            return false;
        } else {
            Status error_status = Status::MemoryLimitExceeded(
                    "Query {} workload group memory is exceeded"


In the memory_usage > limit branch, the error is constructed with the message "workload group memory is exceeded", but the branch condition indicates the query/requestor has exceeded its own limit (memory_usage > limit). This makes the cancellation reason misleading for users and logs. Consider updating the message (and/or error type) to reflect query memory limit exceeded (optionally including usage/limit values), reserving the workload-group message for the watermark/limit path.

Suggested change

"Query {} workload group memory is exceeded"

"Query {} memory limit is exceeded"

Copilot · 2026-04-09T09:39:39Z

be/src/runtime/workload_group/workload_group_manager.cpp

+        bool exceed_low_watermark = false;
+        bool exceed_high_watermark = false;
+        wg->check_mem_used(size_to_reserve, &exceed_low_watermark, &exceed_high_watermark);
+        if (!exceed_high_watermark) {


PR description currently contains duplicated template sections and placeholder references (e.g., close #xxx, Related PR: #xxx) which conflict with the earlier stated summary and make the intended linkage/closure ambiguous. Please clean up the PR description so it reflects the actual issue/PR references and the single intended problem statement.

### What problem does this PR solve? Issue Number: None Related PR: apache#62285 Problem Summary: Address review feedback for the workload group paused-query change by avoiding unsigned wraparound in the test helper loop, making the reserve-failure test cleanup exception-safe, and clarifying the cancel message when the query itself exceeds its memory limit during workload group pressure handling. ### Release note None ### Check List (For Author) - Test: No need to test (small follow-up on test cleanup and cancellation message; attempted incremental build but the sandbox hit a ccache temporary-directory permission issue) - Behavior changed: Yes (the cancellation message now reports query memory limit exceeded instead of workload group memory exceeded in that branch) - Does this need documentation: No

mrhhsg · 2026-04-09T14:38:59Z

run buildall

hello-stephen · 2026-04-09T18:45:17Z

BE UT Coverage Report

Increment line coverage 100.00% (17/17) 🎉

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Category	Coverage
Function Coverage	52.99% (20123/37972)
Line Coverage	36.54% (189171/517651)
Region Coverage	32.81% (146903/447675)
Branch Coverage	33.92% (64260/189459)

hello-stephen · 2026-04-09T18:55:01Z

BE Regression && UT Coverage Report

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Category	Coverage
Function Coverage	73.58% (27362/37187)
Line Coverage	57.23% (295357/516069)
Region Coverage	54.53% (246390/451808)
Branch Coverage	56.11% (106638/190041)

github-actions · 2026-04-10T02:35:53Z

PR approved by at least one committer and no changes requested.

github-actions · 2026-04-10T02:35:55Z

PR approved by anyone and no changes requested.

Issue Number: None Related PR: apache#62285 Problem Summary: Address review feedback for the workload group paused-query change by avoiding unsigned wraparound in the test helper loop, making the reserve-failure test cleanup exception-safe, and clarifying the cancel message when the query itself exceeds its memory limit during workload group pressure handling. None - Test: No need to test (small follow-up on test cleanup and cancellation message; attempted incremental build but the sandbox hit a ccache temporary-directory permission issue) - Behavior changed: Yes (the cancellation message now reports query memory limit exceeded instead of workload group memory exceeded in that branch) - Does this need documentation: No

mrhhsg · 2026-04-10T03:58:55Z

run buildall

hello-stephen · 2026-04-10T05:27:22Z

BE UT Coverage Report

Increment line coverage 100.00% (17/17) 🎉

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Category	Coverage
Function Coverage	53.01% (20130/37974)
Line Coverage	36.56% (189251/517688)
Region Coverage	32.82% (146948/447692)
Branch Coverage	33.92% (64266/189471)

hello-stephen · 2026-04-10T06:25:35Z

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Function Coverage	73.68% (27399/37189)
Line Coverage	57.31% (295804/516106)
Region Coverage	54.39% (245749/451825)
Branch Coverage	56.19% (106783/190053)

…ll fails Issue Number: None Related PR: None Problem Summary: Keep queries paused after WORKLOAD_GROUP_MEMORY_EXCEEDED when retrying the same reserve would still exceed the workload group high watermark, and add a manager unit test that exercises a real reserve failure path. None - Test: Unit Test - Incrementally compiled , , and - Full was not completed because linking triggers a large incremental rebuild in this worktree - Behavior changed: Yes (queries that still cannot satisfy the same workload group reserve stay paused instead of being resumed immediately) - Does this need documentation: No

Issue Number: None Related PR: apache#62285 Problem Summary: Address review feedback for the workload group paused-query change by avoiding unsigned wraparound in the test helper loop, making the reserve-failure test cleanup exception-safe, and clarifying the cancel message when the query itself exceeds its memory limit during workload group pressure handling. None - Test: No need to test (small follow-up on test cleanup and cancellation message; attempted incremental build but the sandbox hit a ccache temporary-directory permission issue) - Behavior changed: Yes (the cancellation message now reports query memory limit exceeded instead of workload group memory exceeded in that branch) - Does this need documentation: No

mrhhsg · 2026-04-10T07:49:30Z

run buildall

mrhhsg · 2026-04-10T09:54:50Z

run buildall

hello-stephen · 2026-04-10T16:06:26Z

BE UT Coverage Report

Increment line coverage 100.00% (17/17) 🎉

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Category	Coverage
Function Coverage	53.02% (20140/37985)
Line Coverage	36.57% (189358/517840)
Region Coverage	32.83% (147014/447820)
Branch Coverage	33.95% (64344/189523)

hello-stephen · 2026-04-10T16:12:03Z

BE Regression && UT Coverage Report

Increment line coverage 100.00% (17/17) 🎉

Increment coverage report
Complete coverage report

Category	Coverage
Function Coverage	73.65% (27396/37199)
Line Coverage	57.31% (295890/516256)
Region Coverage	54.44% (246038/451952)
Branch Coverage	56.18% (106809/190105)

github-actions · 2026-04-11T07:02:35Z

PR approved by at least one committer and no changes requested.

…ll fails (#62285) ### What problem does this PR solve? Issue Number: None Related PR: None Problem Summary: Keep queries paused after WORKLOAD_GROUP_MEMORY_EXCEEDED when retrying the same reserve would still exceed the workload group high watermark, and add a manager unit test that exercises a real reserve failure path. ### Release note None ### Check List (For Author) - Test: Unit Test - Incrementally compiled , , and - Full was not completed because linking triggers a large incremental rebuild in this worktree - Behavior changed: Yes (queries that still cannot satisfy the same workload group reserve stay paused instead of being resumed immediately) - Does this need documentation: No ### What problem does this PR solve? Issue Number: close #xxx Related PR: #xxx Problem Summary: ### Release note None ### Check List (For Author) - Test  - [ ] 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  - Behavior changed: - [ ] No. - [ ] Yes.  - Does this need documentation? - [ ] No. - [ ] Yes.  ### Check List (For Reviewer who merge this PR) - [ ] Confirm the release note - [ ] Confirm test cases - [ ] Confirm document - [ ] Add branch pick label

… reserve still fails #62285 (#62407) Cherry-picked from #62285 Co-authored-by: Jerry Hu <hushenggang@selectdb.com>

mrhhsg requested a review from Copilot April 9, 2026 09:31

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mrhhsg dismissed stale reviews from yiguolei and jacktengg via f9a62eb April 10, 2026 03:58

mrhhsg force-pushed the fix_spill_wg_fail branch from e1ecfae to f9a62eb Compare April 10, 2026 03:58

github-actions bot removed the approved Indicates a PR has been approved by one committer. label Apr 10, 2026

mrhhsg added 2 commits April 10, 2026 15:42

mrhhsg force-pushed the fix_spill_wg_fail branch from f9a62eb to 52975b5 Compare April 10, 2026 07:48

yiguolei approved these changes Apr 11, 2026

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morningman approved these changes Apr 12, 2026

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yiguolei merged commit 61034e3 into apache:master Apr 12, 2026
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yiguolei added the dev/4.1.x label Apr 12, 2026

github-actions bot mentioned this pull request Apr 12, 2026

branch-4.1: [fix](be) Keep workload group paused queries blocked when reserve still fails #62285 #62407

Merged

mrhhsg deleted the fix_spill_wg_fail branch April 12, 2026 09:14

yiguolei pushed a commit that referenced this pull request Apr 12, 2026

branch-4.1: [fix](be) Keep workload group paused queries blocked when…

1dab2e6

… reserve still fails #62285 (#62407) Cherry-picked from #62285 Co-authored-by: Jerry Hu <hushenggang@selectdb.com>

yiguolei added dev/4.1.0-merged and removed dev/4.1.x labels Apr 12, 2026

	while (check_times-- > 0) {
	while (check_times > 0) {
	--check_times;

	"Query {} workload group memory is exceeded"
	"Query {} memory limit is exceeded"

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mrhhsg commented Apr 9, 2026

What problem does this PR solve?

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What problem does this PR solve?

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BE UT Coverage Report

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BE Regression && UT Coverage Report

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BE Regression && UT Coverage Report

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