[HDFS-175] FSNamesystem.startFile throws an IOException when the number of chosen targets is less than the required minimum number

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Assignee: Unassigned
• Reporter: Hairong Kuang
• Created: 11/Apr/07 18:48
• Updated: 20/Jun/09 07:42

Description

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)

Issue Links

• relates to: HADOOP-1256 Dfs image loading and edits loading creates multiple instances of DatanodeDescriptor for the same datanode