FAQ
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.

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postedJul 8, '11 at 4:41p
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