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https://issues.apache.org/jira/browse/HDFS-15118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17035507#comment-17035507
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Ayush Saxena commented on HDFS-15118:
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Seems TestDelegationTokensWithHA was related.
Raised HDFS-15164 for this
> [SBN Read] Slow clients when Observer reads are enabled but there are no
> Observers on the cluster.
> --------------------------------------------------------------------------------------------------
>
> Key: HDFS-15118
> URL: https://issues.apache.org/jira/browse/HDFS-15118
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Affects Versions: 2.10.0
> Reporter: Konstantin Shvachko
> Assignee: Chen Liang
> Priority: Major
> Fix For: 3.3.0, 3.1.4, 3.2.2, 2.10.1
>
> Attachments: HDFS-15118.001.patch, HDFS-15118.002.patch
>
>
> We see substantial degradation in performance of HDFS clients, when Observer
> reads are enabled via {{ObserverReadProxyProvider}}, but there are no
> ObserverNodes on the cluster.
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