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https://issues.apache.org/jira/browse/HDFS-16547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17940658#comment-17940658
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ASF GitHub Bot commented on HDFS-16547:
---------------------------------------
adityarverma opened a new pull request, #7577:
URL: https://github.com/apache/hadoop/pull/7577
…o observer state (#4201)
Signed-off-by: Erik Krogen <xkro...@apache.org>
Reviewed-by: Zengqiang Xu <xuzq_zan...@163.com>
(cherry picked from commit 8f971b0e5413b491a2c7043bd25b046777e07395)
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### Description of PR
Backports a feature to "block transition of namenode to observer state if it
is standby", back to branch-3.3 from trunk.
### How was this patch tested?
unit tests and build passing
### For code changes:
- [x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [x] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [x] If adding new dependencies to the code, are these dependencies
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> [SBN read] Namenode in safe mode should not be transfered to observer state
> ---------------------------------------------------------------------------
>
> Key: HDFS-16547
> URL: https://issues.apache.org/jira/browse/HDFS-16547
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 3.4.0
> Reporter: Tao Li
> Assignee: Tao Li
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> Currently, when a Namenode is in safemode(under starting or enter safemode
> manually), we can transfer this Namenode to Observer by command. This
> Observer node may receive many requests and then throw a SafemodeException,
> this causes unnecessary failover on the client.
> So Namenode in safe mode should not be transfer to observer state.
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