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https://issues.apache.org/jira/browse/HADOOP-19862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18073594#comment-18073594
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ASF GitHub Bot commented on HADOOP-19862:
-----------------------------------------
hadoop-yetus commented on PR #8426:
URL: https://github.com/apache/hadoop/pull/8426#issuecomment-4247676320
:confetti_ball: **+1 overall**
| Vote | Subsystem | Runtime | Logfile | Comment |
|:----:|----------:|--------:|:--------:|:-------:|
| +0 :ok: | reexec | 0m 32s | | Docker mode activated. |
|||| _ Prechecks _ |
| +1 :green_heart: | dupname | 0m 0s | | No case conflicting files
found. |
| +0 :ok: | codespell | 0m 0s | | codespell was not available. |
| +0 :ok: | detsecrets | 0m 0s | | detect-secrets was not available.
|
| +1 :green_heart: | @author | 0m 0s | | The patch does not contain
any @author tags. |
| +1 :green_heart: | test4tests | 0m 0s | | The patch appears to
include 1 new or modified test files. |
|||| _ trunk Compile Tests _ |
| +1 :green_heart: | mvninstall | 41m 27s | | trunk passed |
| +1 :green_heart: | compile | 1m 7s | | trunk passed with JDK
Ubuntu-21.0.10+7-Ubuntu-124.04 |
| +1 :green_heart: | compile | 1m 9s | | trunk passed with JDK
Ubuntu-17.0.18+8-Ubuntu-124.04.1 |
| +1 :green_heart: | checkstyle | 1m 2s | | trunk passed |
| +1 :green_heart: | mvnsite | 1m 14s | | trunk passed |
| +1 :green_heart: | javadoc | 1m 5s | | trunk passed with JDK
Ubuntu-21.0.10+7-Ubuntu-124.04 |
| +1 :green_heart: | javadoc | 1m 1s | | trunk passed with JDK
Ubuntu-17.0.18+8-Ubuntu-124.04.1 |
| +1 :green_heart: | spotbugs | 1m 44s | | trunk passed |
| +1 :green_heart: | shadedclient | 28m 46s | | branch has no errors
when building and testing our client artifacts. |
|||| _ Patch Compile Tests _ |
| +1 :green_heart: | mvninstall | 0m 42s | | the patch passed |
| +1 :green_heart: | compile | 0m 38s | | the patch passed with JDK
Ubuntu-21.0.10+7-Ubuntu-124.04 |
| +1 :green_heart: | javac | 0m 38s | | the patch passed |
| +1 :green_heart: | compile | 0m 38s | | the patch passed with JDK
Ubuntu-17.0.18+8-Ubuntu-124.04.1 |
| +1 :green_heart: | javac | 0m 38s | | the patch passed |
| +1 :green_heart: | blanks | 0m 0s | | The patch has no blanks
issues. |
| +1 :green_heart: | checkstyle | 0m 28s | | the patch passed |
| +1 :green_heart: | mvnsite | 0m 42s | | the patch passed |
| +1 :green_heart: | javadoc | 0m 31s | | the patch passed with JDK
Ubuntu-21.0.10+7-Ubuntu-124.04 |
| +1 :green_heart: | javadoc | 0m 31s | | the patch passed with JDK
Ubuntu-17.0.18+8-Ubuntu-124.04.1 |
| +1 :green_heart: | spotbugs | 1m 21s | | the patch passed |
| +1 :green_heart: | shadedclient | 27m 37s | | patch has no errors
when building and testing our client artifacts. |
|||| _ Other Tests _ |
| +1 :green_heart: | unit | 3m 23s | | hadoop-aws in the patch passed.
|
| +1 :green_heart: | asflicense | 0m 36s | | The patch does not
generate ASF License warnings. |
| | | 117m 51s | | |
| Subsystem | Report/Notes |
|----------:|:-------------|
| Docker | ClientAPI=1.54 ServerAPI=1.54 base:
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8426/2/artifact/out/Dockerfile
|
| GITHUB PR | https://github.com/apache/hadoop/pull/8426 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall
mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets |
| uname | Linux 10e36e2ee5a9 5.15.0-164-generic #174-Ubuntu SMP Fri Nov 14
20:25:16 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | dev-support/bin/hadoop.sh |
| git revision | trunk / beb077be13ff4bb812b7298d9f8e5099b5dd7a6c |
| Default Java | Ubuntu-17.0.18+8-Ubuntu-124.04.1 |
| Multi-JDK versions |
/usr/lib/jvm/java-21-openjdk-amd64:Ubuntu-21.0.10+7-Ubuntu-124.04
/usr/lib/jvm/java-17-openjdk-amd64:Ubuntu-17.0.18+8-Ubuntu-124.04.1 |
| Test Results |
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8426/2/testReport/ |
| Max. process+thread count | 610 (vs. ulimit of 10000) |
| modules | C: hadoop-tools/hadoop-aws U: hadoop-tools/hadoop-aws |
| Console output |
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8426/2/console |
| versions | git=2.43.0 maven=3.9.11 spotbugs=4.9.7 |
| Powered by | Apache Yetus 0.14.1 https://yetus.apache.org |
This message was automatically generated.
> S3A: Thread leak from AWS SDK v2 ScheduledExecutorService
> ---------------------------------------------------------
>
> Key: HADOOP-19862
> URL: https://issues.apache.org/jira/browse/HADOOP-19862
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Konstantin Bereznyakov
> Priority: Major
> Labels: pull-request-available
>
> AWS SDK v2 S3 clients create internal ScheduledExecutorService instances that
> accumulate over time, causing unbounded thread growth. Thread dumps show
> thousands of sdk-ScheduledExecutor-* threads in processes that create
> multiple S3AFileSystem instances.
> Environment
> - Hadoop 3.4.x with AWS SDK v2
> - Not observed in Hadoop 3.3.x (AWS SDK v1)
> Observed Behavior
> Thread dump comparison:
> Hadoop 3.3.x (AWS SDK v1): Normal thread count
> Hadoop 3.4.x (AWS SDK v2): 1600+ "sdk-ScheduledExecutor-*" threads
> Thread pattern:
> "sdk-ScheduledExecutor-0-0" daemon prio=5 waiting
> "sdk-ScheduledExecutor-0-1" daemon prio=5 waiting
> ...
> "sdk-ScheduledExecutor-0-4" daemon prio=5 waiting
> "sdk-ScheduledExecutor-1-0" daemon prio=5 waiting
> ...
> Root Cause
> AWS SDK v2's SdkDefaultClientBuilder creates a ScheduledThreadPoolExecutor
> with 5 threads per client when no executor is explicitly provided
> (https://github.com/aws/aws-sdk-java-v2/issues/1690):
> Executors.newScheduledThreadPool(5,
> new
> ThreadFactoryBuilder().threadNamePrefix("sdk-ScheduledExecutor").build())
> These threads are used for retry scheduling, timeout handling, and
> credential refresh.
> Contributing Factors
> 1. AbstractFileSystem has no caching
> Unlike FileSystem.get() which uses CACHE.get(uri, conf),
> AbstractFileSystem.get() always creates new instances:
> // AbstractFileSystem.java:263-266
> public static AbstractFileSystem get(final URI uri, final Configuration
> conf) {
> return createFileSystem(uri, conf); // NO CACHING
> }
> Each FileContext.getFileContext() call with an S3 URI creates:
> - New AbstractFileSystem (S3A)
> - New S3AFileSystem
> - New S3Client
> - 5 new sdk-ScheduledExecutor threads
> 2. S3Client threads not released on close
> As documented in https://github.com/aws/aws-sdk-java-v2/issues/1690:
> "When using cached, ephemeral clients, I can see that the scheduled thread
> pool will at times be leaked when the aws client is evicted"
> 3. Multiple client types affected
> S3A creates multiple AWS SDK clients:
> - S3Client (sync)
> - S3AsyncClient
> - STS client (for delegation tokens)
> - KMS client (for encryption)
> Each client instance creates its own 5-thread pool.
> Impact
> - Unbounded thread growth in any process using S3A
> - Resource exhaustion leading to OOM or system instability
> - Particularly affects YARN NodeManager, Spark drivers/executors, and other
> services that create many filesystem instances
> Related
> - https://github.com/aws/aws-sdk-java-v2/issues/1690 - SDK issue
> documenting the problem
> - https://github.com/aws/aws-sdk-java-v2/pull/4002 - SDK fix allowing
> shared executor configuration
> - HADOOP-19624 - Similar thread leak in ABFS (AbfsClientThrottlingAnalyzer)
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