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Can I change the IP/hostname of the dfs name without data loss? - HDFS - [mail # user]
...Hadoop version: hadoop-  My NN machine has 2 IP addresses and 2 hostnames assigned to them respectively. I have configured "fs.default.name" using one of the hostnames and use...
   Author: Jianhui Zhang, 2013-01-04, 22:43
NN uses up all ports (java.net.BindException: Cannot assign requested address) - HDFS - [mail # user]
...version: hadoop-  We've seen this the second time. The JT had this error:  2012-10-08 11:44:03,928 WARN org.apache.hadoop.hdfs.DFSClient: Problem renewing lease for DFSCl...
   Author: Jianhui Zhang, 2012-10-09, 23:17
unhealthy NN after startup - HDFS - [mail # user]
...Hi,  I was restarting the DFS cluster. First, the DNs did not join. But if I kept stopping and starting each DN, eventually, all DNs joined the NN. But the NN doesn't look healthy. &nbs...
   Author: Jianhui Zhang, 2012-07-03, 01:04
Re: Namenode hangs on startup - HDFS - [mail # user]
...Thanks for helping.  I do have a secondary namenode.  And I'm starting one datanode at a time now. Previously I was using start-dfs.sh to start NN and slaves. I observed pretty str...
   Author: Jianhui Zhang, 2012-07-02, 22:30
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