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https://issues.apache.org/jira/browse/HDFS-17232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17778169#comment-17778169
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ASF GitHub Bot commented on HDFS-17232:
---------------------------------------
hadoop-yetus commented on PR #6208:
URL: https://github.com/apache/hadoop/pull/6208#issuecomment-1773868190
:confetti_ball: **+1 overall**
| Vote | Subsystem | Runtime | Logfile | Comment |
|:----:|----------:|--------:|:--------:|:-------:|
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|||| _ trunk Compile Tests _ |
| +1 :green_heart: | mvninstall | 51m 44s | | trunk passed |
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|||| _ Patch Compile Tests _ |
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| +1 :green_heart: | javadoc | 0m 32s | | the patch passed with JDK
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| +1 :green_heart: | javadoc | 0m 25s | | the patch passed with JDK
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|||| _ Other Tests _ |
| +1 :green_heart: | unit | 23m 27s | | hadoop-hdfs-rbf in the patch
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| +1 :green_heart: | asflicense | 0m 36s | | The patch does not
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| | | 172m 3s | | |
| Subsystem | Report/Notes |
|----------:|:-------------|
| Docker | ClientAPI=1.43 ServerAPI=1.43 base:
https://ci-hadoop.apache.org/job/hadoop-multibranch-windows-10/job/PR-6208/1/artifact/out/Dockerfile
|
| GITHUB PR | https://github.com/apache/hadoop/pull/6208 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall
mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets |
| uname | Linux eb724e64c425 4.15.0-213-generic #224-Ubuntu SMP Mon Jun 19
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| Build tool | maven |
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| git revision | trunk / d94604ceca49d6605ccfbe9df88bd783f82c61a7 |
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| Test Results |
https://ci-hadoop.apache.org/job/hadoop-multibranch-windows-10/job/PR-6208/1/testReport/
|
| Max. process+thread count | 2413 (vs. ulimit of 5500) |
| modules | C: hadoop-hdfs-project/hadoop-hdfs-rbf U:
hadoop-hdfs-project/hadoop-hdfs-rbf |
| Console output |
https://ci-hadoop.apache.org/job/hadoop-multibranch-windows-10/job/PR-6208/1/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.
> RBF: Fix NoNamenodesAvailableException for a long time, when use observer
> -------------------------------------------------------------------------
>
> Key: HDFS-17232
> URL: https://issues.apache.org/jira/browse/HDFS-17232
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Jian Zhang
> Assignee: Jian Zhang
> Priority: Major
> Labels: pull-request-available
> Attachments: HDFS-17232.001.patch
>
>
> *Describe*
> I solved the NoNamenodesAvailableException for a long time, when failover
> without using observer, but when using observer, there are still many
> problems.
> # When the observer fails and there is no active namenode at this time,
> even if we can rotate the cache, the next request will shuffle the observer
> namenode to the front of the cache due to the use of the observer, so retry
> will still send the request to the failed observer node.
> # If there are multiple observers, and an exception occurs when accessing an
> observer and there is no active namenode at this time, a
> NoNamenodesAvailableException will be caused and the server will try again.
> However, since using the observer will put the observer node at the front of
> the cache, it may still fail.
> # When there are multiple observers, one of which is unavailable and there
> is no active namenode at this time, we should continue to try the next
> observer, so that the currently unavailable observer can be marked as
> unavailable, and subsequent requests can avoid the unavailable observer.
> # If it is due to an illegal operation, that is, even if the operation is
> sent to the active namenode, an exception will occur, resulting in
> NoNamenodesAvailableException. If the cache is rotated at this time, the next
> normal request will be sent to the namenode that is indeed the standby,
> causing an error in the legal request. , so illegal operations should not
> rotate the cache.
>
> Detailed bug description: HDFS-17166
>
> {*}How to reproduce{*}
> I have provided unit tests:TestNoNamenodesAvailableLongTime
> You can use the original code and run my new unit tests to reproduce the
> above problems.
>
>
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