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https://issues.apache.org/jira/browse/HDFS-8821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14641777#comment-14641777
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Harsh J commented on HDFS-8821:
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+1 looks good to me. This should help avoid the continual confusion people new
to HDFS HA appear to have (from experience) about whether that error is to be
taken seriously or not. Thank you for writing up the wiki entry too!
bq. hadoop.hdfs.server.namenode.ha.TestStandbyIsHot
Test name appears relevant but the failing test does not (fails at counting
proper under-replicated blocks value). I'll still test this again manually
before committing (by Tuesday EOD).
> Explain message "Operation category X is not supported in state standby"
> -------------------------------------------------------------------------
>
> Key: HDFS-8821
> URL: https://issues.apache.org/jira/browse/HDFS-8821
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Gautam Gopalakrishnan
> Assignee: Gautam Gopalakrishnan
> Priority: Minor
> Attachments: HDFS-8821-1.patch, HDFS-8821-2.patch
>
>
> There is one message specifically that causes many users to question the
> health of their HDFS cluster, namely "Operation category READ/WRITE is not
> supported in state standby".
> HDFS-3447 is an attempt to lower the logging severity for StandbyException
> related messages but it is not resolved yet. So this jira is an attempt to
> explain this particular message so it appears less scary.
> The text is question 3.17 in the Hadoop Wiki FAQ
> ref:
> https://wiki.apache.org/hadoop/FAQ#What_does_the_message_.22Operation_category_READ.2FWRITE_is_not_supported_in_state_standby.22_mean.3F
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