Nomination Evidence: dongjoon-hyun

Project: apache/spark Period: 2026-02-14 to 2026-02-21

Summary

dongjoon-hyun contributes both code (15 PRs) and reviews (68 reviews), with a strong focus on welcoming newcomers (35 first-timer PR reviews).

Highlights

15 commits, 68 PRs reviewed, 35 review comments | https://github.com/apache/spark/commits?author=dongjoon-hyun
Drove PR #54355 ([SPARK-55578][SQL][TESTS] Improve DockerJDBCIntegrationSuite to support sleepBeforeTesting): https://github.com/apache/spark/pull/54355
Review on PR #54374 ([SPARK-55597][INFRA] Add initial issue templates for spark): "Yes. It should be, @gaogaotiantian . > For this specific case, do we want to k......" https://github.com/apache/spark/pull/54374
Review comment on PR #53859 ([SPARK-55092][SQL] Disable partition grouping in KeyGroupedPartitioning when not needed): "Ya, this sounds like a new copyTagFrom-related bug to me, too. In this case, could you make a new JIRA issue (and its..." https://github.com/apache/spark/pull/53859

Contribution statistics

Code contributions (GitHub)

PRs opened: 15
PRs merged: 0
Lines added: 456
Lines deleted: 233
Commits: 15

Code review

PRs reviewed: 68
Review comments given: 35
Issue comments: 59
- APPROVED: 23 (33%)
- CHANGES_REQUESTED: 1 (1%)
- COMMENTED: 43 (63%)

Composite score

Dimension	Score	Notes
Complexity	0.0/10	0 high-complexity PRs of 1 scored
Stewardship	8.3/10	35% maintenance work, 100% consistency
Review depth	6.9/10	0.8 comments/review, 41% questions, 19 contributors
Composite	5.1/10	out of 66 contributors

Review relationships

People this contributor reviews most

peter-toth: 14 reviews
gaogaotiantian: 11 reviews
parthchandra: 11 reviews
sarutak: 7 reviews
viirya: 5 reviews
zhengruifeng: 4 reviews
pan3793: 3 reviews
ueshin: 3 reviews
Dzeri96: 2 reviews
cloud-fan: 1 reviews

People who review this contributor's PRs most

peter-toth: 6 reviews
sarutak: 3 reviews
zhengruifeng: 2 reviews
pan3793: 1 reviews
HyukjinKwon: 1 reviews
Yicong-Huang: 1 reviews
yaooqinn: 1 reviews
huaxingao: 1 reviews

Newcomer welcoming

dongjoon-hyun reviewed 35 PRs from contributors with 3 or fewer PRs in the project, including cloud-fan, LuciferYang, pan3793, zhengruifeng, vinodkc and 5 others.

Community health profile

Relational metrics: how this contributor strengthens the community beyond code output.

Net reviewer ratio: 4.5x
Interaction breadth: 19 unique contributors (concentration: 21%)
Newcomer welcoming: 35 reviews on PRs from contributors with 3 or fewer PRs
- Names: cloud-fan, LuciferYang, pan3793, zhengruifeng, vinodkc, HyukjinKwon, Dzeri96, zgzzbws, yaooqinn, manuzhang
Helping ratio: 56% of GitHub comments directed at others' PRs
Review depth: 0.8 comments/review, 41% questions (53 comments on 68 reviews)
Stewardship: 35% of work is maintenance (29/83 PRs: 8 authored, 21 reviewed)
Consistency: 100% (2/2 weeks active)

Complexity of authored work

PRs scored: 1
High complexity (>= 0.5): 0
Low complexity (< 0.5): 1
Average complexity: 0.114

Quality of review contributions

Probing review comments (expressing uncertainty, challenging assumptions): 3

Most significant probing reviews (on highest-complexity PRs)

PR #54374 ([SPARK-55597][INFRA] Add initial issue templates for spark, score 0.497)
- Topics: micro versions
- Comment: "Yes. It should be, @gaogaotiantian . > For this specific case, do we want to k..."
PR #54315 ([SPARK-55522][WEBUI] Allow inline scripts, event handlers and styles in Spark UI with Content-Security-Policy, score 0.477)
- Comment: "May I ask why this is removed?"
PR #54352 ([SPARK-55490][PS][FOLLOW-UP] Fix groupby(as_index=False).agg with dict, score 0.427)
- Comment: "This is set instead of dict, isn't it, @ueshin ? I'm a little confused with ..."

Highest-judgment review comments (on others' PRs)

(Selected by length, technical content, and presence of questions)

PR #53859 ([SPARK-55092][SQL] Disable partition grouping in KeyGroupedPartitioning when not needed)
- File: sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/EnsureRequirements.scala
- "Ya, this sounds like a new copyTagFrom-related bug to me, too. In this case, could you make a new JIRA issue (and its corresponding PR) for traceability , @peter-toth ? - https://github.com/apache/spark/pull/50862 - https://github.com/apache/spark/pull/34172 - https://github.com/apache/spark/pu"
PR #53840 ([SPARK-55075][K8S] Track executor pod creation errors with ExecutorFailureTracker)
- File: resource-managers/kubernetes/core/src/main/scala/org/apache/spark/scheduler/cluster/k8s/KubernetesClusterManager.scala
- "For K8s Deployment and StatefulSet, the following will be correct. Could you revise the message? ```scala - logInfo("Allocator does not support setExecutorPodsLifecycleManager method. " + - "Pod creation failures will not be tracked.") + logInfo("No need to track pod creation failure because a"
PR #54374 ([SPARK-55597][INFRA] Add initial issue templates for spark)
- File: .github/ISSUE_TEMPLATE/bug.yml
- "Can we be more accurate like Apache JIRA issue system? - Since we receive the bug reports for the releases, the bug report version should be 3-digit like 4.1.1 instead of 4.1. - We don't use branch name. So, please use 4.2.0 instead of master."
PR #53840 ([SPARK-55075][K8S] Track executor pod creation errors with ExecutorFailureTracker)
- File: resource-managers/kubernetes/core/src/main/scala/org/apache/spark/scheduler/cluster/k8s/KubernetesClusterManager.scala
- "Shall we use the following style to minimize the change. For example, KubernetesClusterManagerSuite? scala - lifecycleManager: ExecutorPodsLifecycleManager) = { + lifecycleManager: Option[ExecutorPodsLifecycleManager] = None) = { "
PR #54374 ([SPARK-55597][INFRA] Add initial issue templates for spark)
- File: .github/ISSUE_TEMPLATE/bug.yml
- "Yes. It should be, @gaogaotiantian . > For this specific case, do we want to keep all the micro versions? For example, for 3.5, do we want to list all versions from 3.5.0 to 3.5.8? Will that be too many?"

Area focus

Files touched (authored PRs)

connector/docker-integration-tests/src (27 files)
pom.xml (3 files)
.github/workflows/test_report.yml (2 files)
resource-managers/kubernetes/core (2 files)
.github/workflows/benchmark.yml (1 files)
.github/workflows/build_and_test.yml (1 files)
.github/workflows/build_infra_images_cache.yml (1 files)
.github/workflows/build_python_connect.yml (1 files)

Areas reviewed (from PR titles)

metrics (10 PRs)
security (7 PRs)
testing (5 PRs)