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Hadoop, mail # user - how to add JournalNodes

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how to add JournalNodes
lei liu 2013-07-12, 07:27
I use QJM for HA in hadoop2.0,  now  there are three JournalNodes in HDFS
cluster, I want to add two new JournalNodes to HDFS cluster, how to do it?
Do I need to restart HDFS cluster?