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https://issues.apache.org/jira/browse/HDFS-14435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16823373#comment-16823373
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Erik Krogen commented on HDFS-14435:
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Hey [~csun], [~elgoiri] -- can I get a binding +1 from either of you? Want to
make sure it's ok for me (or you! :) ) to commit this.
> ObserverReadProxyProvider is unable to properly fetch HAState from Standby NNs
> ------------------------------------------------------------------------------
>
> Key: HDFS-14435
> URL: https://issues.apache.org/jira/browse/HDFS-14435
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ha, nn
> Affects Versions: 3.3.0
> Reporter: Erik Krogen
> Assignee: Erik Krogen
> Priority: Major
> Attachments: HDFS-14435.000.patch, HDFS-14435.001.patch,
> HDFS-14435.002.patch, HDFS-14435.003.patch, HDFS-14435.004.patch,
> HDFS-14435.005.patch, dt_stack_trace.png
>
>
> We have been seeing issues during testing of the Consistent Read from Standby
> feature that indicate that ORPP is unable to call {{getHAServiceState}} on
> Standby NNs, as they are rejected with a {{StandbyException}}. Upon further
> investigation, we realized that although the Standby allows the
> {{getHAServiceState()}} call, reading a delegation token is not allowed in
> Standby state, thus the call will fail when using DT-based authentication.
> This hasn't caused issues in practice, since ORPP assumes that the state is
> Standby if it is unable to fetch the state, but we should fix the logic to
> properly handle this scenario.
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