[
https://issues.apache.org/jira/browse/HDFS-6000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13910250#comment-13910250
]
Vinayakumar B commented on HDFS-6000:
-------------------------------------
Thanks Jing. When I was testing I faced this problem.
SBN was not able to rollback due to lack of fsimage_rollback.
I will look into patch later.
> Avoid saving namespace when starting rolling upgrade
> ----------------------------------------------------
>
> Key: HDFS-6000
> URL: https://issues.apache.org/jira/browse/HDFS-6000
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode, ha, hdfs-client, namenode
> Reporter: Jing Zhao
> Assignee: Jing Zhao
> Attachments: HDFS-6000.000.patch
>
>
> Currently when administrator sends the "rollingUpgrade start" command to the
> active NN, the NN will trigger a checkpoint (the rollback fsimage). This will
> cause NN not able to serve for a period of time.
> An alternative way is just to let the SBN do checkpoint, and rename the first
> checkpoint after starting the rolling upgrade to rollback image. After the
> rollback image is on both the ANN and the SBN, administrator can start
> upgrading the software.
--
This message was sent by Atlassian JIRA
(v6.1.5#6160)
