[ 
https://issues.apache.org/jira/browse/HDFS-8821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14649130#comment-14649130
 ] 

Hudson commented on HDFS-8821:
------------------------------

SUCCESS: Integrated in Hadoop-Yarn-trunk #1003 (See 
[https://builds.apache.org/job/Hadoop-Yarn-trunk/1003/])
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/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/StandbyState.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt


> 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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