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https://issues.apache.org/jira/browse/HDFS-13286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16461756#comment-16461756
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Erik Krogen commented on HDFS-13286:
------------------------------------
For {{FailoverController#preFailoverChecks()}}, I agree with your logic, but we
need to update the error message here:
{code}
if (!toSvcStatus.getState().equals(HAServiceState.STANDBY)) {
throw new FailoverFailedException(
"Can't failover to an active service");
}
{code}
Currently if you tried to failover to OBSERVER, you would get the message that
you can't failover to an active service. We should update to "Can't failover to
a service not in standby state" or something like that.
Agreed with leaving {{FederationNamenodeServiceState}} for a follow-on JIRA
targeted at RBF support. Created HDFS-13522.
> Add haadmin commands to transition between standby and observer
> ---------------------------------------------------------------
>
> Key: HDFS-13286
> URL: https://issues.apache.org/jira/browse/HDFS-13286
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Chao Sun
> Assignee: Chao Sun
> Priority: Major
> Attachments: HDFS-13286-HDFS-12943.000.patch,
> HDFS-13286-HDFS-12943.001.patch, HDFS-13286-HDFS-12943.002.patch,
> HDFS-13286-HDFS-12943.003.patch, HDFS-13286-HDFS-12943.004.patch
>
>
> As discussed in HDFS-12975, we should allow explicit transition between
> standby and observer through haadmin command, such as:
> {code}
> haadmin -transitionToObserver
> {code}
> Initially we should support transition from observer to standby, and standby
> to observer.
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