[ http://issues.apache.org/jira/browse/HADOOP-329?page=comments#action_12418154 ]
Doug Cutting commented on HADOOP-329: ------------------------------------- This is something that unit tests should have caught. Perhaps we should add a test that starts a two-datanode DFS system? > ClassCastException in DFSClient > ------------------------------- > > Key: HADOOP-329 > URL: http://issues.apache.org/jira/browse/HADOOP-329 > Project: Hadoop > Type: Bug > Components: dfs > Versions: 0.4.0 > Environment: 400 node linux x86 > Reporter: Owen O'Malley > > I'm getting the following message back to my launching application: > Exception in thread "main" org.apache.hadoop.ipc.RemoteException: > java.io.IOException: java.lang.ClassCastException: > org.apache.hadoop.dfs.DatanodeInfo cannot be cast to java.lang.Comparable > at java.util.TreeMap.getEntry(TreeMap.java:325) > at java.util.TreeMap.containsKey(TreeMap.java:209) > at java.util.TreeSet.contains(TreeSet.java:217) > at org.apache.hadoop.dfs.DFSClient.bestNode(DFSClient.java:373) > at org.apache.hadoop.dfs.DFSClient.access$100(DFSClient.java:42) > at > org.apache.hadoop.dfs.DFSClient$DFSInputStream.blockSeekTo(DFSClient.java:520) > at > org.apache.hadoop.dfs.DFSClient$DFSInputStream.read(DFSClient.java:638) > at > org.apache.hadoop.fs.FSDataInputStream$PositionCache.read(FSDataInputStream.java:167) > at java.io.BufferedInputStream.fill(BufferedInputStream.java:218) > at java.io.BufferedInputStream.read1(BufferedInputStream.java:256) > at java.io.BufferedInputStream.read(BufferedInputStream.java:313) > at java.io.DataInputStream.readFully(DataInputStream.java:174) > at java.io.DataInputStream.readFully(DataInputStream.java:150) > at > org.apache.hadoop.fs.FSDataInputStream$Checker.<init>(FSDataInputStream.java:55) > at > org.apache.hadoop.fs.FSDataInputStream.<init>(FSDataInputStream.java:237) > at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:157) > at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:72) > at > org.apache.hadoop.dfs.DistributedFileSystem.copyToLocalFile(DistributedFileSystem.java:182) > at > org.apache.hadoop.mapred.JobInProgress.<init>(JobInProgress.java:83) > at org.apache.hadoop.mapred.JobTracker.submitJob(JobTracker.java:935) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > at java.lang.reflect.Method.invoke(Method.java:589) > at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:243) > at org.apache.hadoop.ipc.Server$Handler.run(Server.java:469) > at org.apache.hadoop.ipc.Client$Connection.run(Client.java:159) -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
