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The "CouldOnlyBeReplicatedTo" page has been changed by SteveLoughran: http://wiki.apache.org/hadoop/CouldOnlyBeReplicatedTo Comment: explain the could only be replicated message New page: = Could Only Be Replicated To ... = A common message people see on startup is "could only be replicated to 0 nodes, instead of 1". What does this mean? It means that the [[BlockReplication|Block Replication]] mechanism of HDFS could not make any copies of a file it wanted to create. This can be caused by * No DataNode instances being up and running. Action: look at the servers, see if the processes are running. * The DataNode instances cannot talk to the server, through networking or Hadoop configuration problems. Action: look at the logs of one of the [[DataNode|DataNodes]]. * Your DataNode instances have no hard disk space in their configured data directories. Action: look at the dfs.data.dir list in the node configurations, verify that at least one of the directories exists, and is writeable by the user running the Hadoop processes. Then look at the logs. This is not a problem in Hadoop, it is a problem in your cluster that you are going to have to fix on your own. Sorry.
