Dear Hadoop Users, I am very new on hadoop, I am just trying to run the tutorials. Currently I am trying to run the Pseudo-Distributed Operation (http://hadoop.apache.org/common/docs/stable/single_node_setup.html).
I have found that there are another users that have had this same problem. But any of the workarounds worked for me. I will copy a fragment of the namenode LOG: 2011-07-08 09:34:38,422 INFO org.apache.hadoop.hdfs.StateChange: *BLOCK* NameSystem.processReport: from 127.0.0.1:50010, blocks: 0, processing time: 1 msecs 2011-07-08 09:38:41,887 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Number of transactions: 0 Total time for transactions(ms): 0Number of transactions batched in Syncs: 0 Number of syncs: 0 SyncTimes(ms): 0 2011-07-08 09:38:42,100 WARN org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Not able to place enough replicas, still in need of 1 2011-07-08 09:38:42,101 INFO org.apache.hadoop.ipc.Server: IPC Server handler 9 on 9000, call addBlock(/tmp/hadoop-gpabon/mapred/system/jobtracker.info, DFSClient_383801114) from 127.0.0.1:60003: error: java.io.IOException: File /tmp/hadoop-gpabon/mapred/system/jobtracker.info could only be replicated to 0 nodes, instead of 1 Note that the timestamp of the logs starts at 09:34, and the IOExceotion was raised at 09:38. This is because one workaround suggests start dfs first, wait some minutes and then start mapred service. Hadoop Version: 0.20.203.0 Java: jdk1.6.0_26 SO: Linux Debian on VirtualBox kernel: 2.6.39-2-686-pae Thank you very much in advanced for your valuable help. Best regards, Gustavo P.
