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From Loïc Chanel <>
Subject HA NameNode switching without reason
Date Thu, 23 Jul 2015 15:51:18 GMT

I am using a high-availability cluster with 3 JournalNodes and 2 NameNodes
on 2 out of 3 of these hosts, and the NameNode switched his host 3 times in
less than 24 hours without apparent reason.

This can't be a network problem, as the logs indicate clearly that the
NameNode can't send logs to the JournalNode running on the exact same host,
while calling it using its IP, and this doesn't seem to be a CPU or RAM
problem as the command sar does not return any abnormality, and Ganglia
graphics show that the JVM has way more memory than it needs to have.

Do any of you have an idea about where the problem might come from ?
Thanks in advance,


Engineering student at TELECOM Nancy
Trainee at Worldline - Villeurbanne

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