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Posted to hdfs-issues@hadoop.apache.org by "Jianfei Jiang (JIRA)" <ji...@apache.org> on 2019/08/01 08:14:00 UTC
[jira] [Commented] (HDFS-8277) Safemode enter fails when Standby
NameNode is down
[ https://issues.apache.org/jira/browse/HDFS-8277?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16897862#comment-16897862 ]
Jianfei Jiang commented on HDFS-8277:
-------------------------------------
Anyone do something to give impetus to the solution of this issue? only this safemod command is left that not be fixed in DFSAdmin. [~brahmareddy] [~vinayakumarb]
> Safemode enter fails when Standby NameNode is down
> --------------------------------------------------
>
> Key: HDFS-8277
> URL: https://issues.apache.org/jira/browse/HDFS-8277
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ha, namenode
> Affects Versions: 2.6.0
> Environment: HDP 2.2.0
> Reporter: Hari Sekhon
> Assignee: Jianfei Jiang
> Priority: Major
> Attachments: HDFS-8277-safemode-edits.patch, HDFS-8277.patch, HDFS-8277_1.patch, HDFS-8277_2.patch, HDFS-8277_3.patch, HDFS-8277_4.patch, HDFS-8277_5.patch
>
>
> HDFS fails to enter safemode when the Standby NameNode is down (eg. due to AMBARI-10536).
> {code}hdfs dfsadmin -safemode enter
> safemode: Call From nn2/x.x.x.x to nn1:8020 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused{code}
> This appears to be a bug in that it's not trying both NameNodes like the standard hdfs client code does, and is instead stopping after getting a connection refused from nn1 which is down. I verified normal hadoop fs writes and reads via cli did work at this time, using nn2. I happened to run this command as the hdfs user on nn2 which was the surviving Active NameNode.
> After I re-bootstrapped the Standby NN to fix it the command worked as expected again.
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