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https://issues.apache.org/jira/browse/HADOOP-15129?focusedWorklogId=643080&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-643080
]
ASF GitHub Bot logged work on HADOOP-15129:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 28/Aug/21 07:06
Start Date: 28/Aug/21 07:06
Worklog Time Spent: 10m
Work Description: hadoop-yetus commented on pull request #3348:
URL: https://github.com/apache/hadoop/pull/3348#issuecomment-907584767
:confetti_ball: **+1 overall**
| Vote | Subsystem | Runtime | Logfile | Comment |
|:----:|----------:|--------:|:--------:|:-------:|
| +0 :ok: | reexec | 0m 57s | | Docker mode activated. |
|||| _ Prechecks _ |
| +1 :green_heart: | dupname | 0m 0s | | No case conflicting files
found. |
| +0 :ok: | codespell | 0m 1s | | codespell 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 45s | | trunk passed |
| +1 :green_heart: | compile | 23m 6s | | trunk passed with JDK
Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 |
| +1 :green_heart: | compile | 19m 29s | | trunk passed with JDK
Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10 |
| +1 :green_heart: | checkstyle | 1m 1s | | trunk passed |
| +1 :green_heart: | mvnsite | 1m 36s | | trunk passed |
| +1 :green_heart: | javadoc | 1m 1s | | trunk passed with JDK
Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 |
| +1 :green_heart: | javadoc | 1m 35s | | trunk passed with JDK
Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10 |
| +1 :green_heart: | spotbugs | 2m 29s | | trunk passed |
| +1 :green_heart: | shadedclient | 18m 30s | | branch has no errors
when building and testing our client artifacts. |
|||| _ Patch Compile Tests _ |
| +1 :green_heart: | mvninstall | 0m 58s | | the patch passed |
| +1 :green_heart: | compile | 22m 8s | | the patch passed with JDK
Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 |
| +1 :green_heart: | javac | 22m 8s | | the patch passed |
| +1 :green_heart: | compile | 19m 35s | | the patch passed with JDK
Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10 |
| +1 :green_heart: | javac | 19m 35s | | the patch passed |
| +1 :green_heart: | blanks | 0m 0s | | The patch has no blanks
issues. |
| +1 :green_heart: | checkstyle | 0m 59s | | the patch passed |
| +1 :green_heart: | mvnsite | 1m 31s | | the patch passed |
| +1 :green_heart: | javadoc | 1m 1s | | the patch passed with JDK
Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 |
| +1 :green_heart: | javadoc | 1m 35s | | the patch passed with JDK
Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10 |
| +1 :green_heart: | spotbugs | 2m 34s | | the patch passed |
| +1 :green_heart: | shadedclient | 18m 35s | | patch has no errors
when building and testing our client artifacts. |
|||| _ Other Tests _ |
| +1 :green_heart: | unit | 18m 26s | | hadoop-common in the patch
passed. |
| +1 :green_heart: | asflicense | 0m 49s | | The patch does not
generate ASF License warnings. |
| | | 191m 49s | | |
| Subsystem | Report/Notes |
|----------:|:-------------|
| Docker | ClientAPI=1.41 ServerAPI=1.41 base:
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3348/1/artifact/out/Dockerfile
|
| GITHUB PR | https://github.com/apache/hadoop/pull/3348 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall
mvnsite unit shadedclient spotbugs checkstyle codespell |
| uname | Linux 4f48b63252a5 4.15.0-147-generic #151-Ubuntu SMP Fri Jun 18
19:21:19 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | dev-support/bin/hadoop.sh |
| git revision | trunk / c8d5b06ff8c2e7629d0bdf5713b7cf35f87bdad6 |
| Default Java | Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10 |
| Multi-JDK versions |
/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
/usr/lib/jvm/java-8-openjdk-amd64:Private
Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10 |
| Test Results |
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3348/1/testReport/ |
| Max. process+thread count | 2539 (vs. ulimit of 5500) |
| modules | C: hadoop-common-project/hadoop-common U:
hadoop-common-project/hadoop-common |
| Console output |
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3348/1/console |
| versions | git=2.25.1 maven=3.6.3 spotbugs=4.2.2 |
| Powered by | Apache Yetus 0.14.0-SNAPSHOT https://yetus.apache.org |
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Issue Time Tracking
-------------------
Worklog Id: (was: 643080)
Time Spent: 20m (was: 10m)
> Datanode caches namenode DNS lookup failure and cannot startup
> --------------------------------------------------------------
>
> Key: HADOOP-15129
> URL: https://issues.apache.org/jira/browse/HADOOP-15129
> Project: Hadoop Common
> Issue Type: Bug
> Components: ipc
> Affects Versions: 2.8.2
> Environment: Google Compute Engine.
> I'm using Java 8, Debian 8, Hadoop 2.8.2.
> Reporter: Karthik Palaniappan
> Assignee: Chris Nauroth
> Priority: Minor
> Labels: pull-request-available
> Attachments: HADOOP-15129.001.patch, HADOOP-15129.002.patch
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> On startup, the Datanode creates an InetSocketAddress to register with each
> namenode. Though there are retries on connection failure throughout the
> stack, the same InetSocketAddress is reused.
> InetSocketAddress is an interesting class, because it resolves DNS names to
> IP addresses on construction, and it is never refreshed. Hadoop re-creates an
> InetSocketAddress in some cases just in case the remote IP has changed for a
> particular DNS name: https://issues.apache.org/jira/browse/HADOOP-7472.
> Anyway, on startup, you cna see the Datanode log: "Namenode...remains
> unresolved" -- referring to the fact that DNS lookup failed.
> {code:java}
> 2017-11-02 16:01:55,115 INFO org.apache.hadoop.hdfs.server.datanode.DataNode:
> Refresh request received for nameservices: null
> 2017-11-02 16:01:55,153 WARN org.apache.hadoop.hdfs.DFSUtilClient: Namenode
> for null remains unresolved for ID null. Check your hdfs-site.xml file to
> ensure namenodes are configured properly.
> 2017-11-02 16:01:55,156 INFO org.apache.hadoop.hdfs.server.datanode.DataNode:
> Starting BPOfferServices for nameservices: <default>
> 2017-11-02 16:01:55,169 INFO org.apache.hadoop.hdfs.server.datanode.DataNode:
> Block pool <registering> (Datanode Uuid unassigned) service to
> cluster-32f5-m:8020 starting to offer service
> {code}
> The Datanode then proceeds to use this unresolved address, as it may work if
> the DN is configured to use a proxy. Since I'm not using a proxy, it forever
> prints out this message:
> {code:java}
> 2017-12-15 00:13:40,712 WARN org.apache.hadoop.hdfs.server.datanode.DataNode:
> Problem connecting to server: cluster-32f5-m:8020
> 2017-12-15 00:13:45,712 WARN org.apache.hadoop.hdfs.server.datanode.DataNode:
> Problem connecting to server: cluster-32f5-m:8020
> 2017-12-15 00:13:50,712 WARN org.apache.hadoop.hdfs.server.datanode.DataNode:
> Problem connecting to server: cluster-32f5-m:8020
> 2017-12-15 00:13:55,713 WARN org.apache.hadoop.hdfs.server.datanode.DataNode:
> Problem connecting to server: cluster-32f5-m:8020
> 2017-12-15 00:14:00,713 WARN org.apache.hadoop.hdfs.server.datanode.DataNode:
> Problem connecting to server: cluster-32f5-m:8020
> {code}
> Unfortunately, the log doesn't contain the exception that triggered it, but
> the culprit is actually in IPC Client:
> https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Client.java#L444.
> This line was introduced in https://issues.apache.org/jira/browse/HADOOP-487
> to give a clear error message when somebody mispells an address.
> However, the fix in HADOOP-7472 doesn't apply here, because that code happens
> in Client#getConnection after the Connection is constructed.
> My proposed fix (will attach a patch) is to move this exception out of the
> constructor and into a place that will trigger HADOOP-7472's logic to
> re-resolve addresses. If the DNS failure was temporary, this will allow the
> connection to succeed. If not, the connection will fail after ipc client
> retries (default 10 seconds worth of retries).
> I want to fix this in ipc client rather than just in Datanode startup, as
> this fixes temporary DNS issues for all of Hadoop.
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