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From "Gautam Gopalakrishnan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8821) Explain message "Operation category X is not supported in state standby"
Date Sun, 26 Jul 2015 02:59:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14641828#comment-14641828

Gautam Gopalakrishnan commented on HDFS-8821:

Thanks Harsh, I didn't see any failures locally.

$ mvn test -DTestStandbyIsHot
Running org.apache.hadoop.hdfs.server.namenode.ha.TestStandbyIsHot
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 20.369 sec - in org.apache.hadoop.hdfs.server.namenode.ha.TestStandbyIsHot

> 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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