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https://issues.apache.org/jira/browse/YARN-11809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17948004#comment-17948004
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ASF GitHub Bot commented on YARN-11809:
---------------------------------------
hadoop-yetus commented on PR #7589:
URL: https://github.com/apache/hadoop/pull/7589#issuecomment-2837374691
:confetti_ball: **+1 overall**
| Vote | Subsystem | Runtime | Logfile | Comment |
|:----:|----------:|--------:|:--------:|:-------:|
| +0 :ok: | reexec | 0m 21s | | Docker mode activated. |
|||| _ Prechecks _ |
| +1 :green_heart: | dupname | 0m 0s | | No case conflicting files
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| +0 :ok: | detsecrets | 0m 1s | | detect-secrets was not available.
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| +1 :green_heart: | @author | 0m 0s | | The patch does not contain
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| +1 :green_heart: | test4tests | 0m 0s | | The patch appears to
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|||| _ trunk Compile Tests _ |
| +1 :green_heart: | mvninstall | 23m 56s | | trunk passed |
| +1 :green_heart: | compile | 0m 33s | | trunk passed with JDK
Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu120.04 |
| +1 :green_heart: | compile | 0m 30s | | trunk passed with JDK
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| +1 :green_heart: | mvnsite | 0m 36s | | trunk passed |
| +1 :green_heart: | javadoc | 0m 35s | | trunk passed with JDK
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Private Build-1.8.0_442-8u442-b06~us1-0ubuntu1~20.04-b06 |
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| +1 :green_heart: | shadedclient | 20m 58s | | branch has no errors
when building and testing our client artifacts. |
|||| _ Patch Compile Tests _ |
| +1 :green_heart: | mvninstall | 0m 26s | | the patch passed |
| +1 :green_heart: | compile | 0m 30s | | the patch passed with JDK
Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu120.04 |
| +1 :green_heart: | javac | 0m 30s | | the patch passed |
| +1 :green_heart: | compile | 0m 26s | | the patch passed with JDK
Private Build-1.8.0_442-8u442-b06~us1-0ubuntu1~20.04-b06 |
| +1 :green_heart: | javac | 0m 26s | | the patch passed |
| +1 :green_heart: | blanks | 0m 0s | | The patch has no blanks
issues. |
| +1 :green_heart: | checkstyle | 0m 23s | | the patch passed |
| +1 :green_heart: | mvnsite | 0m 28s | | the patch passed |
| +1 :green_heart: | javadoc | 0m 27s | | the patch passed with JDK
Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu120.04 |
| +1 :green_heart: | javadoc | 0m 25s | | the patch passed with JDK
Private Build-1.8.0_442-8u442-b06~us1-0ubuntu1~20.04-b06 |
| +1 :green_heart: | spotbugs | 1m 9s | | the patch passed |
| +1 :green_heart: | shadedclient | 21m 16s | | patch has no errors
when building and testing our client artifacts. |
|||| _ Other Tests _ |
| +1 :green_heart: | unit | 126m 31s | |
hadoop-yarn-server-resourcemanager in the patch passed. |
| +1 :green_heart: | asflicense | 0m 25s | | The patch does not
generate ASF License warnings. |
| | | 202m 2s | | |
| Subsystem | Report/Notes |
|----------:|:-------------|
| Docker | ClientAPI=1.49 ServerAPI=1.49 base:
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7589/8/artifact/out/Dockerfile
|
| GITHUB PR | https://github.com/apache/hadoop/pull/7589 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall
mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets |
| uname | Linux ab83f8f88379 5.15.0-136-generic #147-Ubuntu SMP Sat Mar 15
15:53:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | dev-support/bin/hadoop.sh |
| git revision | trunk / d82c488b4f48a6fd294d3d47948f44d8e04fc837 |
| Default Java | Private Build-1.8.0_442-8u442-b06~us1-0ubuntu1~20.04-b06 |
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/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu120.04
/usr/lib/jvm/java-8-openjdk-amd64:Private
Build-1.8.0_442-8u442-b06~us1-0ubuntu1~20.04-b06 |
| Test Results |
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7589/8/testReport/ |
| Max. process+thread count | 956 (vs. ulimit of 5500) |
| modules | C:
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager
U:
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager
|
| Console output |
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7589/8/console |
| versions | git=2.25.1 maven=3.6.3 spotbugs=4.2.2 |
| Powered by | Apache Yetus 0.14.0 https://yetus.apache.org |
This message was automatically generated.
> Support application backoff mechanism for CapacityScheduler
> -----------------------------------------------------------
>
> Key: YARN-11809
> URL: https://issues.apache.org/jira/browse/YARN-11809
> Project: Hadoop YARN
> Issue Type: Improvement
> Reporter: Tao Yang
> Assignee: Tao Yang
> Priority: Major
> Labels: pull-request-available
>
> Currently, when an application repeatedly fails to schedule tasks due to
> resource constraints or other issues, it continues to be considered in every
> scheduling cycle, potentially causing unnecessary scheduling overhead and
> resource contention. This can lead to inefficient resource utilization and
> increased scheduling latency. This is especially impactful in global
> scheduling where the scheduler needs to consider resources across the entire
> cluster. The number of allocated containers per second may drop from 1000+ to
> 200+, when the scheduler is overwhelmed with repeated scheduling attempts for
> applications that cannot be satisfied.
> Thus it's necessary to introduce a new application backoff mechanism in the
> Capacity Scheduler to temporarily skip applications that fail to schedule
> tasks after a certain number of opportunities, improving the scheduling
> efficiency.
> h2. Solution
> Implement an application backoff mechanism that:
> * Tracks missed scheduling opportunities for each application
> * Temporarily skips applications that exceed a configurable threshold of
> missed opportunities
> * Automatically resumes scheduling after a configurable backoff period
> * Provides configurable parameters at both global and queue levels
> h3. Configuration Parameters
> h3. Global Configuration
> * yarn.scheduler.capacity.app-backoff.enabled: Enable/disable backoff
> mechanism globally (default: false)
> * yarn.scheduler.capacity.app-backoff.interval-ms: Global backoff duration
> in milliseconds (default: 3000ms)
> * yarn.scheduler.capacity.app-backoff.missed-threshold: Global number of
> missed opportunities before backoff (default: 3)
> h3. Queue-Specific Configuration
> * yarn.scheduler.capacity.<queue-path>.app-backoff.enabled: Enable/disable
> backoff mechanism for a specific queue. When enabled, applications in this
> queue will be temporarily skipped if they fail to schedule tasks after
> reaching the missed opportunities threshold. This setting can be configured
> independently for each queue, allowing for fine-grained control over which
> queues use the backoff mechanism. If not specified, it inherits the global
> setting from yarn.scheduler.capacity.app-backoff.enabled.
> * yarn.scheduler.capacity.<queue-path>.app-backoff.interval-ms: Backoff
> duration in milliseconds for a specific queue. If not specified, it inherits
> the global setting from yarn.scheduler.capacity.app-backoff.interval-ms.
> * yarn.scheduler.capacity.<queue-path>.app-backoff.missed-threshold: Number
> of missed opportunities before backoff for a specific queue. If not
> specified, it inherits the global setting from
> yarn.scheduler.capacity.app-backoff.missed-threshold.
> Queue-specific configurations take precedence over global configurations. If
> a queue-specific configuration is not set, the queue will inherit the global
> configuration values.
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