BackupNode can't start if its storage directory is not manually hacked
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Key: HDFS-3241
URL: https://issues.apache.org/jira/browse/HDFS-3241
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Affects Versions: 3.0.0
Reporter: Brandon Li
Priority: Minor
BackupNode can't start if its storage dir is not formatted (because it extends
NameNode).
After I use "/bin/hadoop namenode -format" to format its storage directory, it
still can't start because the inconsistent namespace with primary namenode.
{noformat}
2012-04-09 18:33:16,464 ERROR namenode.NameNode (NameNode.java:main(958)) -
Exception in namenode join
java.io.IOException: Inconsistent namespace information:
NamespaceInfo has:
LV=-40;NS=1165721067;cTime=0;CID=CID-b8ced26a-4675-476d-b5fb-c9ad337be34a;BPID=BP-1658271424-10.10.10.191-1333658489893.
Storage has:
LV=-40;NS=403924869;cTime=0;CID=CID-57ce694a-172c-4da1-9cd6-d498615e4f1e;BPID=BP-4558626-10.10.10.48-1334021589986.
at
org.apache.hadoop.hdfs.server.protocol.NamespaceInfo.validateStorage(NamespaceInfo.java:109)
at
org.apache.hadoop.hdfs.server.namenode.BackupNode.registerWith(BackupNode.java:332)
at
org.apache.hadoop.hdfs.server.namenode.BackupNode.initialize(BackupNode.java:161)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:546)
at
org.apache.hadoop.hdfs.server.namenode.BackupNode.<init>(BackupNode.java:86)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:893)
{noformat}
The backup node started after I copied the VERSION file from the primary
namenode storage directory to that of the backup node.
This manual hack can be avoided if the backup node can format its local
directory by requesting VERSION info from the primary namenode.
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