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Posted to hdfs-dev@hadoop.apache.org by "Gautam Gopalakrishnan (JIRA)" <ji...@apache.org> on 2015/07/25 09:06:04 UTC

[jira] [Created] (HDFS-8821) Explain message "Operation category X is not supported in state standby"

Gautam Gopalakrishnan created HDFS-8821:
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             Summary: 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
            Priority: Minor


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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