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https://issues.apache.org/jira/browse/HADOOP-19218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17867901#comment-17867901
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ASF GitHub Bot commented on HADOOP-19218:
-----------------------------------------
hadoop-yetus commented on PR #6951:
URL: https://github.com/apache/hadoop/pull/6951#issuecomment-2243985730
:confetti_ball: **+1 overall**
| Vote | Subsystem | Runtime | Logfile | Comment |
|:----:|----------:|--------:|:--------:|:-------:|
| +0 :ok: | reexec | 6m 36s | | 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 | 33m 6s | | trunk passed |
| +1 :green_heart: | compile | 0m 40s | | trunk passed with JDK
Ubuntu-11.0.23+9-post-Ubuntu-1ubuntu120.04.2 |
| +1 :green_heart: | compile | 0m 37s | | trunk passed with JDK
Private Build-1.8.0_412-8u412-ga-1~20.04.1-b08 |
| +1 :green_heart: | checkstyle | 0m 36s | | trunk passed |
| +1 :green_heart: | mvnsite | 0m 45s | | trunk passed |
| +1 :green_heart: | javadoc | 0m 40s | | trunk passed with JDK
Ubuntu-11.0.23+9-post-Ubuntu-1ubuntu120.04.2 |
| +1 :green_heart: | javadoc | 1m 5s | | trunk passed with JDK
Private Build-1.8.0_412-8u412-ga-1~20.04.1-b08 |
| +1 :green_heart: | spotbugs | 1m 41s | | trunk passed |
| +1 :green_heart: | shadedclient | 20m 37s | | branch has no errors
when building and testing our client artifacts. |
|||| _ Patch Compile Tests _ |
| +1 :green_heart: | mvninstall | 0m 35s | | the patch passed |
| +1 :green_heart: | compile | 0m 37s | | the patch passed with JDK
Ubuntu-11.0.23+9-post-Ubuntu-1ubuntu120.04.2 |
| +1 :green_heart: | javac | 0m 37s | | the patch passed |
| +1 :green_heart: | compile | 0m 32s | | the patch passed with JDK
Private Build-1.8.0_412-8u412-ga-1~20.04.1-b08 |
| +1 :green_heart: | javac | 0m 32s | | the patch passed |
| +1 :green_heart: | blanks | 0m 0s | | The patch has no blanks
issues. |
| +1 :green_heart: | checkstyle | 0m 29s | | the patch passed |
| +1 :green_heart: | mvnsite | 0m 36s | | the patch passed |
| +1 :green_heart: | javadoc | 0m 31s | | the patch passed with JDK
Ubuntu-11.0.23+9-post-Ubuntu-1ubuntu120.04.2 |
| +1 :green_heart: | javadoc | 1m 4s | | the patch passed with JDK
Private Build-1.8.0_412-8u412-ga-1~20.04.1-b08 |
| +1 :green_heart: | spotbugs | 1m 44s | | the patch passed |
| +1 :green_heart: | shadedclient | 20m 59s | | patch has no errors
when building and testing our client artifacts. |
|||| _ Other Tests _ |
| +1 :green_heart: | unit | 191m 38s | | hadoop-hdfs in the patch
passed. |
| +1 :green_heart: | asflicense | 0m 29s | | The patch does not
generate ASF License warnings. |
| | | 285m 0s | | |
| Subsystem | Report/Notes |
|----------:|:-------------|
| Docker | ClientAPI=1.44 ServerAPI=1.44 base:
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6951/3/artifact/out/Dockerfile
|
| GITHUB PR | https://github.com/apache/hadoop/pull/6951 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall
mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets |
| uname | Linux 03f89e6b35ac 5.15.0-94-generic #104-Ubuntu SMP Tue Jan 9
15:25:40 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | dev-support/bin/hadoop.sh |
| git revision | trunk / 30bf42dbf5354b22d415ddc5cda71e80ee5ce395 |
| Default Java | Private Build-1.8.0_412-8u412-ga-1~20.04.1-b08 |
| Multi-JDK versions |
/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.23+9-post-Ubuntu-1ubuntu120.04.2
/usr/lib/jvm/java-8-openjdk-amd64:Private
Build-1.8.0_412-8u412-ga-1~20.04.1-b08 |
| Test Results |
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6951/3/testReport/ |
| Max. process+thread count | 4302 (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-6951/3/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.
> Avoid DNS lookup while creating IPC Connection object
> -----------------------------------------------------
>
> Key: HADOOP-19218
> URL: https://issues.apache.org/jira/browse/HADOOP-19218
> Project: Hadoop Common
> Issue Type: Improvement
> Components: ipc
> Reporter: Viraj Jasani
> Assignee: Viraj Jasani
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.3.9, 3.5.0, 3.4.1
>
>
> Been running HADOOP-18628 in production for quite sometime, everything works
> fine as long as DNS servers in HA are available. Upgrading single NS server
> at a time is also a common case, not problematic. Every DNS lookup takes 1ms
> in general.
> However, recently we encountered a case where 2 out of 4 NS servers went down
> (temporarily but it's a rare case). With small duration DNS cache and 2s of
> NS fallback timeout configured in resolv.conf, now any client performing DNS
> lookup can encounter 4s+ delay. This caused namenode outage as listener
> thread is single threaded and it was not able to keep up with large num of
> unique clients (in direct proportion with num of DNS resolutions every few
> seconds) initiating connection on listener port.
> While having 2 out of 4 DNS servers offline is rare case and NS fallback
> settings could also be improved, it is important to note that we don't need
> to perform DNS resolution for every new connection if the intention is to
> improve the insights into VersionMistmatch errors thrown by the server.
> The proposal is the delay the DNS resolution until the server throws the
> error for incompatible header or version mismatch. This would also help with
> ~1ms extra time spent even for healthy DNS lookup.
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