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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8821) Explain message "Operation category X is not supported in state standby"
Date Sat, 25 Jul 2015 20:33:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14641777#comment-14641777
] 

Harsh J commented on HDFS-8821:
-------------------------------

+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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