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Operation category read is not supported in state standby
2022-07-01 22:40:00 【Amnesia】
The root cause
Operation category READ is not supported in state standby
spark task checkpoint Of hdfs Path namenode It's dead ,hadoop namenode An error will be reported after switching .
Other knowledge gained in the process
spark from hadoop Get from configuration nn1,nn2 Two namenode He will try one by one Until we find something available , in other words If the first attempt happens to be standby node , Then the message will be displayed , But it will not affect him to continue to try to be normal namenode node .
however If you write dead ip stay checkpoint There will be problems in .
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