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From Max Schmidt <...@datapath.io>
Subject How to move a namenode to a new host properly
Date Thu, 31 Mar 2016 10:09:28 GMT
Hi there,

what are the correct steps to move a primary Hadoop DFS namenode from
one host to another?

I use the version 2.7.1 of hadoop on Ubuntu 14.04.3 LTS (without YARN).

Steps done:

  * Copy the whole hadoop directory to the new host
  * set the new master in $hadoop_home/etc/hadoop/master
  * updated the fs.default.name tag in $hadoop_home/etc/hadoop/core-site.xml
  * formatted the new namenode with the ClusterID of the old namenode:
    $hadoop_home//bin/hadoop namenode -format -custerId $CLUSTER_ID (I
    removed the slaves from the config just to be sure that none of the
    slaves are affected; maybe that is a problem?)

Problem is that the datanodes still don't come up because of the
mismatch of the clusterid:

|2016-03-30 16:20:28,718 WARN
org.apache.hadoop.hdfs.server.common.Storage: java.io.IOException:
Incompatible clusterIDs in /storage/data: namenode clusterID =
CID-c19c691d-10da-4449-a7b6-c953465ce237; datanode clusterID =
CID-af87cb62-d806-41d6-9638-e9e559dd3ed7 2016-03-30 16:20:28,718 FATAL
org.apache.hadoop.hdfs.server.datanode.DataNode: Initialization failed
for Block pool <registering> (Datanode Uuid unassigned) service to
XXXXXXXXXXXXXX. Exiting. java.io.IOException: All specified directories
are failed to load. |

Any suggestions? Do I have to add the BlockPool-ID as well?

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