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Date: Wed, 11 Apr 2007 11:50:32 -0700 (PDT)
From: "Hairong Kuang (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Created: (HADOOP-1248) FSNamesystem.startFile throws an
 IOException when the number of chosen targets is less than the required
 minimum number
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FSNamesystem.startFile throws an IOException when the number of chosen targets is less than the required minimum number
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                 Key: HADOOP-1248
                 URL: https://issues.apache.org/jira/browse/HADOOP-1248
             Project: Hadoop
          Issue Type: Bug
          Components: dfs
    Affects Versions: 0.12.3
            Reporter: Hairong Kuang
             Fix For: 0.13.0


When I ran a test on a one-node dfs cluster, the test failed because of the exception listed below. First of all, I wonder why chooseTarget returns 0 target when # of datanodes is 1. Secondly I think it would be nicer if startFile retries chooseTarget before throws the exception back to client.

java.io.IOException: Failed to create file /user/hairong/xxx on client 127.0.0.1 because there were not enough datanodes available. Found 0 datanodes but MIN_REPLICATION for the cluster is configured to be 1.
        at org.apache.hadoop.dfs.FSNamesystem.startFile(FSNamesystem.java:813)
        at org.apache.hadoop.dfs.NameNode.create(NameNode.java:294)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:339)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:573)


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