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https://issues.apache.org/jira/browse/HDFS-17868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18056971#comment-18056971
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ASF GitHub Bot commented on HDFS-17868:
---------------------------------------
hadoop-yetus commented on PR #8159:
URL: https://github.com/apache/hadoop/pull/8159#issuecomment-3862257621
:broken_heart: **-1 overall**
| Vote | Subsystem | Runtime | Logfile | Comment |
|:----:|----------:|--------:|:--------:|:-------:|
| +0 :ok: | reexec | 14m 37s | | Docker mode activated. |
|||| _ Prechecks _ |
| +1 :green_heart: | dupname | 0m 1s | | 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. |
| +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 4 new or modified test files. |
|||| _ trunk Compile Tests _ |
| +1 :green_heart: | mvninstall | 41m 44s | | trunk passed |
| +1 :green_heart: | compile | 1m 50s | | trunk passed with JDK
Ubuntu-21.0.10+7-Ubuntu-124.04 |
| +1 :green_heart: | compile | 1m 48s | | trunk passed with JDK
Ubuntu-17.0.18+8-Ubuntu-124.04.1 |
| +1 :green_heart: | checkstyle | 1m 53s | | trunk passed |
| +1 :green_heart: | mvnsite | 1m 56s | | trunk passed |
| +1 :green_heart: | javadoc | 1m 35s | | trunk passed with JDK
Ubuntu-21.0.10+7-Ubuntu-124.04 |
| +1 :green_heart: | javadoc | 1m 32s | | trunk passed with JDK
Ubuntu-17.0.18+8-Ubuntu-124.04.1 |
| +1 :green_heart: | spotbugs | 4m 10s | | trunk passed |
| +1 :green_heart: | shadedclient | 31m 24s | | branch has no errors
when building and testing our client artifacts. |
|||| _ Patch Compile Tests _ |
| +1 :green_heart: | mvninstall | 1m 22s | | the patch passed |
| +1 :green_heart: | compile | 1m 16s | | the patch passed with JDK
Ubuntu-21.0.10+7-Ubuntu-124.04 |
| +1 :green_heart: | javac | 1m 16s | | the patch passed |
| +1 :green_heart: | compile | 1m 16s | | the patch passed with JDK
Ubuntu-17.0.18+8-Ubuntu-124.04.1 |
| +1 :green_heart: | javac | 1m 16s | | the patch passed |
| +1 :green_heart: | blanks | 0m 0s | | The patch has no blanks
issues. |
| -0 :warning: | checkstyle | 1m 16s |
[/results-checkstyle-hadoop-hdfs-project_hadoop-hdfs.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8159/4/artifact/out/results-checkstyle-hadoop-hdfs-project_hadoop-hdfs.txt)
| hadoop-hdfs-project/hadoop-hdfs: The patch generated 71 new + 271 unchanged
- 0 fixed = 342 total (was 271) |
| +1 :green_heart: | mvnsite | 1m 26s | | the patch passed |
| +1 :green_heart: | javadoc | 0m 58s | | the patch passed with JDK
Ubuntu-21.0.10+7-Ubuntu-124.04 |
| +1 :green_heart: | javadoc | 1m 0s | | the patch passed with JDK
Ubuntu-17.0.18+8-Ubuntu-124.04.1 |
| +1 :green_heart: | spotbugs | 3m 49s | | the patch passed |
| +1 :green_heart: | shadedclient | 30m 20s | | patch has no errors
when building and testing our client artifacts. |
|||| _ Other Tests _ |
| -1 :x: | unit | 215m 44s |
[/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8159/4/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt)
| hadoop-hdfs in the patch passed. |
| -1 :x: | asflicense | 0m 50s |
[/results-asflicense.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8159/4/artifact/out/results-asflicense.txt)
| The patch generated 1 ASF License warnings. |
| | | 360m 17s | | |
| Reason | Tests |
|-------:|:------|
| Failed junit tests | hadoop.hdfs.tools.TestDFSAdmin |
| Subsystem | Report/Notes |
|----------:|:-------------|
| Docker | ClientAPI=1.53 ServerAPI=1.53 base:
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8159/4/artifact/out/Dockerfile
|
| GITHUB PR | https://github.com/apache/hadoop/pull/8159 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall
mvnsite unit shadedclient codespell detsecrets xmllint spotbugs checkstyle |
| uname | Linux 74e8a423a15f 5.15.0-161-generic #171-Ubuntu SMP Sat Oct 11
08:17:01 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | dev-support/bin/hadoop.sh |
| git revision | trunk / 164ec1491e564e5ec5a8c487f3ed29c46256b303 |
| 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-8159/4/testReport/ |
| Max. process+thread count | 3117 (vs. ulimit of 5500) |
| 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-8159/4/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.
> introduce BlockPlacementPolicyCrossDC for multi datacenter stretched hdfs
> cluster
> ---------------------------------------------------------------------------------
>
> Key: HDFS-17868
> URL: https://issues.apache.org/jira/browse/HDFS-17868
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: block placement
> Reporter: YUBI LEE
> Priority: Major
> Labels: pull-request-available
>
> I was inspired by the ideas presented in
> https://dan.naver.com/25/sessions/692 and
> https://www.youtube.com/watch?v=1h4k_Dbt0t8 and implemented a new block
> placement policy called BlockPlacementPolicyCrossDC.
> Thanks to [~acedia28] for the original ideas. It would be great if
> [~acedia28] could share an improved or more mature version of this block
> placement policy.
> This implementation introduces the following configuration options
> (default values are shown in parentheses):
> {code}
> dfs.block.replicator.cross.dc.async.enabled (false)
> dfs.block.replicator.cross.dc.preferred.datacenter
> dfs.block.replicator.cross.dc.bandwidth.limit.mb (5120)
> dfs.block.replicator.cross.dc.bandwidth.refill.period.sec (1)
> dfs.block.replicator.cross.dc.sync.paths
> dfs.block.replicator.cross.dc.limited.sync.paths
> {code}
> BlockPlacementPolicyCrossDC assumes that DataNodes are registered with
> two-level rack topology information, such as /dc1/rack1 or /dc2/rack2.
> Based on the ideas from the session mentioned above, this policy supports
> three different HDFS block write modes:
> 1. Synchronous write
> The standard HDFS behavior, where block replicas are synchronously written to
> all target DataNodes.
> 2. Limited synchronous write
> Uses bucket4j to control cross-datacenter traffic.
> Writes below the configured threshold are performed synchronously, while
> writes exceeding the threshold fall back to asynchronous replication.
> 3. Asynchronous write
> The client is initially given only DataNode candidates located in the same
> datacenter.
> With asynchronous write, the hdfs client app will not suffer from write
> latency caused by cross-datacenter communication.
> Any under-replicas are created later through background HDFS replication to
> other datacenters.
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