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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8821) Explain message "Operation category X is not supported in state standby"
Date Fri, 31 Jul 2015 10:43:06 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14649055#comment-14649055

Hudson commented on HDFS-8821:

FAILURE: Integrated in Hadoop-Yarn-trunk-Java8 #273 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk-Java8/273/])
HDFS-8821. Explain message "Operation category X is not supported in state standby". Contributed
by Gautam Gopalakrishnan. (harsh: rev c5caa25b8f2953e2b7a9d2c9dcbdbf1fed95c10b)
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/StandbyState.java

> 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
>             Fix For: 2.8.0
>         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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