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https://issues.apache.org/jira/browse/HDFS-17931?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18085850#comment-18085850
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ASF GitHub Bot commented on HDFS-17931:
---------------------------------------
hadoop-yetus commented on PR #8529:
URL: https://github.com/apache/hadoop/pull/8529#issuecomment-4614627565
:broken_heart: **-1 overall**
| Vote | Subsystem | Runtime | Logfile | Comment |
|:----:|----------:|--------:|:--------:|:-------:|
| +0 :ok: | reexec | 0m 59s | | 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 :x: | test4tests | 0m 0s | | The patch doesn't appear to include
any new or modified tests. Please justify why no new tests are needed for this
patch. Also please list what manual steps were performed to verify this patch.
|
|||| _ trunk Compile Tests _ |
| +1 :green_heart: | mvninstall | 105m 35s | | trunk passed |
| +1 :green_heart: | compile | 1m 45s | | trunk passed with JDK
Ubuntu-21.0.11+10-1-24.04.2-Ubuntu |
| +1 :green_heart: | compile | 1m 50s | | trunk passed with JDK
Ubuntu-17.0.19+10-1-24.04.2-Ubuntu |
| +1 :green_heart: | checkstyle | 1m 53s | | trunk passed |
| +1 :green_heart: | mvnsite | 1m 53s | | trunk passed |
| +1 :green_heart: | javadoc | 1m 34s | | trunk passed with JDK
Ubuntu-21.0.11+10-1-24.04.2-Ubuntu |
| +1 :green_heart: | javadoc | 1m 33s | | trunk passed with JDK
Ubuntu-17.0.19+10-1-24.04.2-Ubuntu |
| +1 :green_heart: | spotbugs | 4m 11s | | trunk passed |
| +1 :green_heart: | shadedclient | 32m 4s | | branch has no errors
when building and testing our client artifacts. |
|||| _ Patch Compile Tests _ |
| +1 :green_heart: | mvninstall | 1m 20s | | the patch passed |
| +1 :green_heart: | compile | 1m 17s | | the patch passed with JDK
Ubuntu-21.0.11+10-1-24.04.2-Ubuntu |
| +1 :green_heart: | javac | 1m 17s | | the patch passed |
| +1 :green_heart: | compile | 1m 19s | | the patch passed with JDK
Ubuntu-17.0.19+10-1-24.04.2-Ubuntu |
| +1 :green_heart: | javac | 1m 19s | | the patch passed |
| +1 :green_heart: | blanks | 0m 0s | | The patch has no blanks
issues. |
| +1 :green_heart: | checkstyle | 1m 13s | | the patch passed |
| +1 :green_heart: | mvnsite | 1m 26s | | the patch passed |
| +1 :green_heart: | javadoc | 0m 58s | | the patch passed with JDK
Ubuntu-21.0.11+10-1-24.04.2-Ubuntu |
| +1 :green_heart: | javadoc | 1m 1s | | the patch passed with JDK
Ubuntu-17.0.19+10-1-24.04.2-Ubuntu |
| +1 :green_heart: | spotbugs | 3m 48s | | the patch passed |
| +1 :green_heart: | shadedclient | 30m 56s | | patch has no errors
when building and testing our client artifacts. |
|||| _ Other Tests _ |
| +1 :green_heart: | unit | 274m 51s | | hadoop-hdfs in the patch
passed. |
| +1 :green_heart: | asflicense | 0m 48s | | The patch does not
generate ASF License warnings. |
| | | 470m 21s | | |
| Subsystem | Report/Notes |
|----------:|:-------------|
| Docker | ClientAPI=1.54 ServerAPI=1.54 base:
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8529/2/artifact/out/Dockerfile
|
| GITHUB PR | https://github.com/apache/hadoop/pull/8529 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall
mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets |
| uname | Linux ac31007e1707 5.15.0-173-generic #183-Ubuntu SMP Fri Mar 6
13:29:34 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | dev-support/bin/hadoop.sh |
| git revision | trunk / 674948cf99bb079e959800fe80f666c1bc5941e4 |
| Default Java | Ubuntu-17.0.19+10-1-24.04.2-Ubuntu |
| Multi-JDK versions |
/usr/lib/jvm/java-21-openjdk-amd64:Ubuntu-21.0.11+10-1-24.04.2-Ubuntu
/usr/lib/jvm/java-17-openjdk-amd64:Ubuntu-17.0.19+10-1-24.04.2-Ubuntu |
| Test Results |
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8529/2/testReport/ |
| Max. process+thread count | 3006 (vs. ulimit of 10000) |
| modules | C: hadoop-hdfs-project/hadoop-hdfs U:
hadoop-hdfs-project/hadoop-hdfs |
| Console output |
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8529/2/console |
| versions | git=2.43.0 maven=3.9.15 spotbugs=4.9.7 |
| Powered by | Apache Yetus 0.14.1 https://yetus.apache.org |
This message was automatically generated.
> Add early return in PendingDataNodeMessages.removeQueuedBlock when queue is
> empty
> ---------------------------------------------------------------------------------
>
> Key: HDFS-17931
> URL: https://issues.apache.org/jira/browse/HDFS-17931
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Janus Chow
> Assignee: Janus Chow
> Priority: Major
>
> removeQueuedBlock() is called for every block in a block report. When the
> pending queue is empty (count == 0), the method still unconditionally
> allocates a new Block() and does a HashMap.get() before returning null. On
> large DataNodes this is millions of unnecessary allocations per report.
>
> This is especially costly under ZGC, where these operations trigger
> load/write barriers even on the no-op path. In practice, on a ZGC Observer
> NameNode, count is almost always 0 because ZGC's sub-millisecond pauses keep
> EditLogTailer current, so isGenStampInFuture() rarely triggers.
> Fix: add a count == 0 early return before the new Block() allocation.
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