That's not an error - that just means that the daemon thread is waiting for a connection (IO event)
The logs in $HADOOP_HOME/log/ are entirely empty? Both the .log and .out files? I find that hard to believe :) -Todd On Mon, Sep 14, 2009 at 7:57 AM, Vincenzo Gulisano < [email protected]> wrote: > Hi Todd, > thanks for your answer. I've already tried this solution. No error is > reported. > As the program remains in a "wait state", no error is detected. > I've seen that the error > "sun.nio.ch.EPollArrayWrapper. epollWait (native method)" > affects other old bugs of hadoop, but I couldn't solve mine. > Thanks again > > > > > 2009/9/14 Todd Lipcon <[email protected]> > > > Hi Vincenzo, > > > > Look at the log output of your daemons. My guess is that you'll find > > something pretty clear there. > > > > -Todd > > > > On Mon, Sep 14, 2009 at 7:46 AM, Vincenzo Gulisano < > > [email protected]> wrote: > > > > > Hi, > > > after a lot of unsuccessful attempts of running hadoop distributed file > > > system on my machine, I've located one possible error. > > > Maybe you have some ideas about what's going on. > > > > > > Experiment: > > > What I'm doing is simply executing start-all.sh and hadoop dfsadmin > > -report > > > > > > After the setup I can check that everything is working using: > > > > > > jps > > > ... > > > 17421 NameNode > > > 17519 DataNode > > > 17611 SecondaryNameNode > > > 17685 JobTracker > > > 17778 TaskTracker > > > 18425 Jps > > > ... > > > > > > > > > > > > > > > AND > > > > > > sudo netstat -plten | grep java > > > ... > > > tcp 0 0 127.0.0.1:54310 0.0.0.0:* LISTEN 1062 > > > 346907 17421/java (namenode) > > > tcp 0 0 127.0.0.1:54311 0.0.0.0:* LISTEN 1062 > > > 347480 17685/java (job tracker) > > > > > > > > > > > > > > > 2 things happen launching the application: > > > 1) The program waits and nothing happens (99% of the times) > > > 2) The program works but the report shows that the HDFS has some > problems > > > > > > Taking a look to the debug: > > > > > > > > > main: > > > > > > [1] java.lang.Object.wait (native method) > > > [2] java.lang.Object.wait (Object.java:485) > > > [3] org.apache.hadoop.ipc.Client.call (Client.java:725) > > > [4] org.apache.hadoop.ipc.RPC$Invoker.invoke (RPC.java:220) > > > [5] $Proxy0.getProtocolVersion (null) > > > [6] org.apache.hadoop.ipc.RPC.getProxy (RPC.java:359) > > > [7] org.apache.hadoop.hdfs.DFSClient.createRPCNamenode > > > (DFSClient.java:105) > > > [8] org.apache.hadoop.hdfs.DFSClient.<init> (DFSClient.java:208) > > > [9] org.apache.hadoop.hdfs.DFSClient.<init> (DFSClient.java:169) > > > [10] org.apache.hadoop.hdfs.DistributedFileSystem.initialize > > > (DistributedFileSystem.java:82) > > > [11] org.apache.hadoop.fs.FileSystem.createFileSystem > > > (FileSystem.java:1,384) > > > [12] org.apache.hadoop.fs.FileSystem.access$200 (FileSystem.java:66) > > > [13] org.apache.hadoop.fs.FileSystem$Cache.get (FileSystem.java:1,399) > > > [14] org.apache.hadoop.fs.FileSystem.get (FileSystem.java:199) > > > [15] org.apache.hadoop.fs.FileSystem.get (FileSystem.java:96) > > > [16] org.apache.hadoop.fs.FsShell.init (FsShell.java:85) > > > [17] org.apache.hadoop.hdfs.tools.DFSAdmin.run (DFSAdmin.java:777) > > > [18] org.apache.hadoop.util.ToolRunner.run (ToolRunner.java:65) > > > [19] org.apache.hadoop.util.ToolRunner.run (ToolRunner.java:79) > > > [20] org.apache.hadoop.hdfs.tools.DFSAdmin.main (DFSAdmin.java:858) > > > > > > IPC Client (47) connection to localhost/127.0.0.1:8020 from vincenzo: > > > [1] sun.nio.ch.EPollArrayWrapper.epollWait (native method) > > > [2] sun.nio.ch.EPollArrayWrapper.poll (EPollArrayWrapper.java:215) > > > [3] sun.nio.ch.EPollSelectorImpl.doSelect (EPollSelectorImpl.java:65) > > > [4] sun.nio.ch.SelectorImpl.lockAndDoSelect (SelectorImpl.java:69) > > > [5] sun.nio.ch.SelectorImpl.select (SelectorImpl.java:80) > > > [6] org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.select > > > (SocketIOWithTimeout.java:332) > > > [7] org.apache.hadoop.net.SocketIOWithTimeout.doIO > > > (SocketIOWithTimeout.java:157) > > > [8] org.apache.hadoop.net.SocketInputStream.read > > > (SocketInputStream.java:155) > > > [9] org.apache.hadoop.net.SocketInputStream.read > > > (SocketInputStream.java:128) > > > [10] java.io.FilterInputStream.read (FilterInputStream.java:116) > > > [11] org.apache.hadoop.ipc.Client$Connection$PingInputStream.read > > > (Client.java:276) > > > [12] java.io.BufferedInputStream.fill (BufferedInputStream.java:218) > > > [13] java.io.BufferedInputStream.read (BufferedInputStream.java:237) > > > [14] java.io.DataInputStream.readInt (DataInputStream.java:370) > > > [15] org.apache.hadoop.ipc.Client$Connection.receiveResponse > > > (Client.java:501) > > > [16] org.apache.hadoop.ipc.Client$Connection.run (Client.java:446) > > > > > > Have you any idea about why this can happen? > > > > > > I've tries also to telnet the host:port and it works. I've tried all > > > possible addresses in the configuration (localhost / 127.0.0.1 / name / > > > name.domain ). > > > > > > Any help is appreciated, > > > Thanks in advance > > > > > > Vincenzo > > > > > > > > > -- > Vincenzo Massimiliano Gulisano > PhD student - UPM - Distributed System Lab. >
