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https://issues.apache.org/jira/browse/HADOOP-18296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18011310#comment-18011310
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ASF GitHub Bot commented on HADOOP-18296:
-----------------------------------------
hadoop-yetus commented on PR #7846:
URL: https://github.com/apache/hadoop/pull/7846#issuecomment-3141608204
:confetti_ball: **+1 overall**
| Vote | Subsystem | Runtime | Logfile | Comment |
|:----:|----------:|--------:|:--------:|:-------:|
| +0 :ok: | reexec | 0m 52s | | 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.
|
| +0 :ok: | xmllint | 0m 0s | | xmllint was not available. |
| +0 :ok: | markdownlint | 0m 0s | | markdownlint 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 5 new or modified test files. |
|||| _ trunk Compile Tests _ |
| +0 :ok: | mvndep | 10m 8s | | Maven dependency ordering for branch |
| +1 :green_heart: | mvninstall | 39m 23s | | trunk passed |
| +1 :green_heart: | compile | 18m 57s | | trunk passed with JDK
Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04 |
| +1 :green_heart: | compile | 18m 8s | | trunk passed with JDK
Private Build-1.8.0_452-8u452-ga~us1-0ubuntu1~20.04-b09 |
| +1 :green_heart: | checkstyle | 4m 59s | | trunk passed |
| +1 :green_heart: | mvnsite | 2m 45s | | trunk passed |
| +1 :green_heart: | javadoc | 2m 8s | | trunk passed with JDK
Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04 |
| +1 :green_heart: | javadoc | 1m 38s | | trunk passed with JDK
Private Build-1.8.0_452-8u452-ga~us1-0ubuntu1~20.04-b09 |
| +1 :green_heart: | spotbugs | 4m 20s | | trunk passed |
| +1 :green_heart: | shadedclient | 42m 15s | | branch has no errors
when building and testing our client artifacts. |
|||| _ Patch Compile Tests _ |
| +0 :ok: | mvndep | 0m 31s | | Maven dependency ordering for patch |
| +1 :green_heart: | mvninstall | 1m 54s | | the patch passed |
| +1 :green_heart: | compile | 18m 43s | | the patch passed with JDK
Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04 |
| +1 :green_heart: | javac | 18m 43s | | the patch passed |
| +1 :green_heart: | compile | 17m 29s | | the patch passed with JDK
Private Build-1.8.0_452-8u452-ga~us1-0ubuntu1~20.04-b09 |
| +1 :green_heart: | javac | 17m 29s | | the patch passed |
| +1 :green_heart: | blanks | 0m 0s | | The patch has no blanks
issues. |
| -0 :warning: | checkstyle | 5m 26s |
[/results-checkstyle-root.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7846/1/artifact/out/results-checkstyle-root.txt)
| root: The patch generated 1 new + 142 unchanged - 0 fixed = 143 total (was
142) |
| +1 :green_heart: | mvnsite | 3m 4s | | the patch passed |
| +1 :green_heart: | javadoc | 2m 25s | | the patch passed with JDK
Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04 |
| +1 :green_heart: | javadoc | 1m 57s | | the patch passed with JDK
Private Build-1.8.0_452-8u452-ga~us1-0ubuntu1~20.04-b09 |
| +1 :green_heart: | spotbugs | 4m 57s | | the patch passed |
| +1 :green_heart: | shadedclient | 45m 51s | | patch has no errors
when building and testing our client artifacts. |
|||| _ Other Tests _ |
| +1 :green_heart: | unit | 24m 33s | | hadoop-common in the patch
passed. |
| +1 :green_heart: | unit | 3m 57s | | hadoop-aws in the patch passed.
|
| +1 :green_heart: | asflicense | 1m 19s | | The patch does not
generate ASF License warnings. |
| | | 282m 52s | | |
| Subsystem | Report/Notes |
|----------:|:-------------|
| Docker | ClientAPI=1.51 ServerAPI=1.51 base:
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7846/1/artifact/out/Dockerfile
|
| GITHUB PR | https://github.com/apache/hadoop/pull/7846 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall
mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets xmllint
markdownlint |
| uname | Linux 863bf91ffcaa 5.15.0-143-generic #153-Ubuntu SMP Fri Jun 13
19:10:45 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | dev-support/bin/hadoop.sh |
| git revision | trunk / b4e34be892714cbe2fd26c6910bec4cdf6d8ce32 |
| Default Java | Private Build-1.8.0_452-8u452-ga~us1-0ubuntu1~20.04-b09 |
| Multi-JDK versions |
/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
/usr/lib/jvm/java-8-openjdk-amd64:Private
Build-1.8.0_452-8u452-ga~us1-0ubuntu1~20.04-b09 |
| Test Results |
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7846/1/testReport/ |
| Max. process+thread count | 1295 (vs. ulimit of 5500) |
| modules | C: hadoop-common-project/hadoop-common hadoop-tools/hadoop-aws
U: . |
| Console output |
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7846/1/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.
> Memory fragmentation in ChecksumFileSystem Vectored IO implementation.
> ----------------------------------------------------------------------
>
> Key: HADOOP-18296
> URL: https://issues.apache.org/jira/browse/HADOOP-18296
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: common
> Affects Versions: 3.4.0
> Reporter: Mukund Thakur
> Assignee: Steve Loughran
> Priority: Minor
> Labels: fs, pull-request-available
> Fix For: 3.4.2
>
>
> As we have implemented merging of ranges in the ChecksumFSInputChecker
> implementation of vectored IO api, it can lead to memory fragmentation. Let
> me explain by example.
>
> Suppose client requests for 3 ranges.
> 0-500, 700-1000 and 1200-1500.
> Now because of merging, all the above ranges will get merged into one and we
> will allocate a big byte buffer of 0-1500 size but return sliced byte buffers
> for the desired ranges.
> Now once the client is done reading all the ranges, it will only be able to
> free the memory for requested ranges and memory of the gaps will never be
> released for eg here (500-700 and 1000-1200).
>
> Note this only happens for direct byte buffers.
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