Caused by: java.net.UnknownHostException: XX: XX: Temporary failure in name resolution
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搭建 hadoop HA时，启动JournalNode，报：
java.io.IOException: java.lang.RuntimeException: Could not resolve Kerberos principal name: java.net.UnknownHostException: tq3: tq3: Temporary failure in name resolution
其中，tq3为hostname
解决方式：将tq3放入hosts中，如本地ip:192.168.3.3,则hosts
192.168.3.3 tq3
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