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https://issues.apache.org/jira/browse/HDFS-13286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16452588#comment-16452588
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Erik Krogen commented on HDFS-13286:
------------------------------------
Last comments:
* NameNode#transitionToActive and #transitionToObserver has some hard-coded
strings, e.g. {{"Cannot transition from 'observer' to 'active'"}}, that could
be replaced with calls to {{OBSERVER_STATE.toString}} and
{{ACTIVE_STATE.toString}}
* Revisiting the {{ObserverState}} at a later time sounds fine to me
Also, I managed to find the precommit build; it's timing out (I think because
it's running the unit tests for all of hdfs, common, and yarn) but it completed
the [common unit
tests|https://builds.apache.org/job/PreCommit-HDFS-Build/24061/artifact/out/patch-unit-hadoop-common-project_hadoop-common.txt]
(clean) and the [hdfs unit
tests|https://builds.apache.org/job/PreCommit-HDFS-Build/24061/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt]
(failures but look unrelated). Please address the outstanding
[checkstylehttps://builds.apache.org/job/PreCommit-HDFS-Build/24061/artifact/out/diff-checkstyle-root.txt]
issues as well.
> 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
>
>
> 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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