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Posted to common-user@hadoop.apache.org by Todd McFarland <to...@gmail.com> on 2012/05/19 17:29:58 UTC
RemoteException writing files
Hi folks,
(Resending to this group, sent to common-dev before, pretty sure that's for
Hadoop internal development - sorry for that..)
I'm pretty stuck here. I've been researching for hours and I haven't made
any forward progress on this one.
I have a vmWare installation of Cloudera Hadoop 0.20. The following
commands to create a directory and copy a file from the shared folder *work
fine*, so I'm confident everything is setup correctly:
[cloudera@localhost bin]$ hadoop fs -mkdir /user/cloudera/testdir
[cloudera@localhost bin]$ hadoop fs -put /mnt/hgfs/shared_folder/file1.txt
/user/cloudera/testdir/file1.txt
The file shows up fine in the HDFS doing it this way on the Linux VM.
*However*, when I try doing the equivalent operation in Java everything
works great until I try to close() FSDataOutputStream.
I'm left with the new directory and a zero byte size file. One suspicious
thing is that the user is "admin" instead of "cloudera" which I haven't
figured out why. Here is the error:
12/05/19 09:45:46 INFO hdfs.DFSClient: Exception in createBlockOutputStream
127.0.0.1:50010 java.net.ConnectException: Connection refused: no further
information
12/05/19 09:45:46 INFO hdfs.DFSClient: Abandoning block
blk_1931357292676354131_1068
12/05/19 09:45:46 INFO hdfs.DFSClient: Excluding datanode 127.0.0.1:50010
12/05/19 09:45:46 WARN hdfs.DFSClient: DataStreamer Exception:
org.apache.hadoop.ipc.RemoteException: java.io.IOException: File
/user/admin/testdir/file1.txt could only be replicated to 0 nodes, instead
of 1
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1533)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:667)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
There are certainly lots of search references to "*could only be replicated
to 0 nodes, instead of 1*" but chasing down those suggestions hasn't helped.
I have run *jps* and* netstat* and that looks good. All services are
running, all port seem to be good. The *health check* looks good, plenty
of disk space, no failed nodes...
Here is the java (it fails when it hits "fs.close()":
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
public class TestFileTrans {
public static void main(String[] args) {
Configuration config = new Configuration();
config.addResource(new
Path("c:/_bigdata/client_libs/core-site.xml"));
config.addResource(new
Path("c:/_bigdata/client_libs/hdfs-site.xml"));
System.out.println("hadoop.tmp.dir: " +
config.get("hadoop.tmp.dir"));
try{
FileSystem dfs = FileSystem.get(config);
// this will default to admin unless the workingDirectory is
explicitly set..
System.out.println("HDFS Working Directory: " +
dfs.getWorkingDirectory().toString());
String dirName = "testdir";
Path src = new Path(dfs.getWorkingDirectory()+"/"+dirName);
dfs.mkdirs(src);
System.out.println("HDFS Directory created: " +
dfs.getWorkingDirectory().toString());
loadFile(dfs, src);
}catch(IOException e){
System.out.println("Error" + e.getMessage());
}
}
private static void loadFile(FileSystem dfs, Path src) throws
IOException{
FileInputStream fis = new
FileInputStream("c:/_bigdata/shared_folder/file1.txt");
int len = fis.available();
byte[] btr = new byte[len];
fis.read(btr);
FSDataOutputStream fs = dfs.create(new Path(src.toString()
+"/file1.txt"));
fs.write(btr);
fs.flush();
fs.close();
}
}
Any help would be greatly appreciated!
Re: RemoteException writing files
Posted by samir das mohapatra <sa...@gmail.com>.
Hi
This Could be due to the Following reason
1) The *NameNode <http://wiki.apache.org/hadoop/NameNode>* does not have
any available DataNodes
2) Namenode not able to start properly
3) other wise some IP Issue .
Note:- Pleaes mention localhost instead of 127.0.0.1 (If it is in
local)
Follow URL:
http://wiki.apache.org/hadoop/FAQ#What_does_.22file_could_only_be_replicated_to_0_nodes.2C_instead_of_1.22_mean.3F
Thanks
samir
On Sat, May 19, 2012 at 11:30 PM, samir das mohapatra <
samir.helpdoc@gmail.com> wrote:
> Hi
> This Could be due to the Following reason
>
> 1) The *NameNode <http://wiki.apache.org/hadoop/NameNode>* does not have
> any available DataNodes
> 2) Namenode not able to start properly
> 3) other wise some IP Issue .
> Note:- Pleaes mention localhost instead of 127.0.0.1 (If it is in
> local)
>
> Follow URL:
>
> http://wiki.apache.org/hadoop/FAQ#What_does_.22file_could_only_be_replicated_to_0_nodes.2C_instead_of_1.22_mean.3F
>
>
> Thanks
> samir
>
>
>
> On Sat, May 19, 2012 at 8:59 PM, Todd McFarland <to...@gmail.com>wrote:
>
>> Hi folks,
>>
>> (Resending to this group, sent to common-dev before, pretty sure that's
>> for
>> Hadoop internal development - sorry for that..)
>>
>> I'm pretty stuck here. I've been researching for hours and I haven't made
>> any forward progress on this one.
>>
>> I have a vmWare installation of Cloudera Hadoop 0.20. The following
>> commands to create a directory and copy a file from the shared folder
>> *work
>> fine*, so I'm confident everything is setup correctly:
>>
>> [cloudera@localhost bin]$ hadoop fs -mkdir /user/cloudera/testdir
>> [cloudera@localhost bin]$ hadoop fs -put
>> /mnt/hgfs/shared_folder/file1.txt
>> /user/cloudera/testdir/file1.txt
>>
>> The file shows up fine in the HDFS doing it this way on the Linux VM.
>>
>> *However*, when I try doing the equivalent operation in Java everything
>> works great until I try to close() FSDataOutputStream.
>> I'm left with the new directory and a zero byte size file. One suspicious
>> thing is that the user is "admin" instead of "cloudera" which I haven't
>> figured out why. Here is the error:
>>
>> 12/05/19 09:45:46 INFO hdfs.DFSClient: Exception in
>> createBlockOutputStream
>> 127.0.0.1:50010 java.net.ConnectException: Connection refused: no further
>> information
>> 12/05/19 09:45:46 INFO hdfs.DFSClient: Abandoning block
>> blk_1931357292676354131_1068
>> 12/05/19 09:45:46 INFO hdfs.DFSClient: Excluding datanode 127.0.0.1:50010
>> 12/05/19 09:45:46 WARN hdfs.DFSClient: DataStreamer Exception:
>> org.apache.hadoop.ipc.RemoteException: java.io.IOException: File
>> /user/admin/testdir/file1.txt could only be replicated to 0 nodes, instead
>> of 1
>> at
>>
>> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1533)
>> at
>>
>> org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:667)
>> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>> at
>>
>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>> at
>>
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>>
>> There are certainly lots of search references to "*could only be
>> replicated
>> to 0 nodes, instead of 1*" but chasing down those suggestions hasn't
>> helped.
>> I have run *jps* and* netstat* and that looks good. All services are
>> running, all port seem to be good. The *health check* looks good, plenty
>> of disk space, no failed nodes...
>>
>> Here is the java (it fails when it hits "fs.close()":
>>
>> import java.io.BufferedReader;
>> import java.io.FileInputStream;
>> import java.io.FileReader;
>> import java.io.IOException;
>> import org.apache.hadoop.conf.Configuration;
>> import org.apache.hadoop.fs.FSDataInputStream;
>> import org.apache.hadoop.fs.FSDataOutputStream;
>> import org.apache.hadoop.fs.FileSystem;
>> import org.apache.hadoop.fs.Path;
>>
>> public class TestFileTrans {
>>
>> public static void main(String[] args) {
>>
>> Configuration config = new Configuration();
>>
>> config.addResource(new
>> Path("c:/_bigdata/client_libs/core-site.xml"));
>> config.addResource(new
>> Path("c:/_bigdata/client_libs/hdfs-site.xml"));
>>
>> System.out.println("hadoop.tmp.dir: " +
>> config.get("hadoop.tmp.dir"));
>> try{
>> FileSystem dfs = FileSystem.get(config);
>>
>> // this will default to admin unless the workingDirectory is
>> explicitly set..
>>
>> System.out.println("HDFS Working Directory: " +
>> dfs.getWorkingDirectory().toString());
>>
>> String dirName = "testdir";
>> Path src = new Path(dfs.getWorkingDirectory()+"/"+dirName);
>> dfs.mkdirs(src);
>>
>> System.out.println("HDFS Directory created: " +
>> dfs.getWorkingDirectory().toString());
>>
>> loadFile(dfs, src);
>>
>> }catch(IOException e){
>> System.out.println("Error" + e.getMessage());
>> }
>>
>> }
>>
>> private static void loadFile(FileSystem dfs, Path src) throws
>> IOException{
>>
>> FileInputStream fis = new
>> FileInputStream("c:/_bigdata/shared_folder/file1.txt");
>>
>> int len = fis.available();
>>
>> byte[] btr = new byte[len];
>>
>> fis.read(btr);
>>
>> FSDataOutputStream fs = dfs.create(new Path(src.toString()
>> +"/file1.txt"));
>>
>> fs.write(btr);
>>
>> fs.flush();
>> fs.close();
>>
>> }
>> }
>>
>> Any help would be greatly appreciated!
>>
>
>
Re: RemoteException writing files
Posted by Altorn <al...@gmail.com>.
U figure out what was wrong? I have same problem, java application on VM works
fine, on win 7 it's didn't.
Re: RemoteException writing files
Posted by Altorn <al...@gmail.com>.
U figure out what was wrong? I have same problem, java application on VM works
fine, on win 7 it's didn't.
Re: RemoteException writing files
Posted by Altorn <al...@gmail.com>.
U figure out what was wrong? I have same problem, java application on VM works
fine, on win 7 it's didn't.
Re: RemoteException writing files
Posted by Altorn <al...@gmail.com>.
U figure out what was wrong? I have same problem, java application on VM works
fine, on win 7 it's didn't.
Re: RemoteException writing files
Posted by Ravi Prakash <ra...@gmail.com>.
Hi Todd,
It might be useful to try the CDH user mailing list too. I'm afraid I
haven't used CDH, so I'm not entirely certain.
The fact that after you run your JAVA program, the NN has created a
directory and a 0-byte file means you were able to contact and interact
with the NN just fine. I'm guessing the problem is in streaming data to the
DN(s). Does the VM have its ports blocked, causing your client (presumably
outside the VM) to be unable to talk the DNs? What happens when you run the
JAVA program from inside the VM?
After your JAVA program is unable to talk to the DN, it asks the NN for
another DN. I'm guessing since there are no more left, you see the message
"*could only be replicated to 0 nodes, instead of 1*" So its kind of a red
herring.
>Using my java program remotely, it simply doesn't work. All I can think of
>is that there is some property on the Java side (in Windows 7) that is
>telling Hadoop (in VMware Linux) to do the block replication differently
>than what it does when the operation is run locally via the command line.
I would be very surprised if this were the issue.
Hope this helps,
Ravi.
On Sun, May 20, 2012 at 9:40 AM, Todd McFarland <to...@gmail.com>wrote:
> Thanks for the links. The behavior is as the links describe but bottom
> line it works fine if I'm copying these files on the Linux VMWare instance
> via the command line.
>
> Using my java program remotely, it simply doesn't work. All I can think of
> is that there is some property on the Java side (in Windows 7) that is
> telling Hadoop (in VMware Linux) to do the block replication differently
> than what it does when the operation is run locally via the command line.
>
> This is a frustrating problem. I'm sure its a 10 second fix if I can find
> the right property to set in the Configuration class.
> This is what I have loaded into the Configuration class so far:
>
> config.addResource(new Path("c:/_bigdata/client_libs/core-site.xml"));
> config.addResource(new Path("c:/_bigdata/client_libs/hdfs-site.xml"));
> config.addResource(new Path("c:/_bigdata/client_libs/mapred-site.xml"));
> //config.set("dfs.replication", "1");
> //config.set("dfs.datanode.address", "192.168.60.128:50010");
>
> Setting "dfs.replication=1" is the default setting from hdfs-site.xml so
> that didn't do anything. I tried to override the dfs.datanode.address in
> case "127.0.0.1:50010" was the issue but it gets overridden on the Linux
> end apparently.
>
> How do I override 127.0.0.1 to localhost? What config file?
>
> -------------------------------------------------------------------------
>
>
> On Sat, May 19, 2012 at 2:00 PM, samir das mohapatra <
> samir.helpdoc@gmail.com> wrote:
>
> > Hi
> > This Could be due to the Following reason
> >
> > 1) The *NameNode <http://wiki.apache.org/hadoop/NameNode>* does not have
> > any available DataNodes
> > 2) Namenode not able to start properly
> > 3) other wise some IP Issue .
> > Note:- Pleaes mention localhost instead of 127.0.0.1 (If it is in
> > local)
> >
> > Follow URL:
> >
> >
> http://wiki.apache.org/hadoop/FAQ#What_does_.22file_could_only_be_replicated_to_0_nodes.2C_instead_of_1.22_mean.3F
> >
> >
> > Thanks
> > samir
> >
> >
> > On Sat, May 19, 2012 at 8:59 PM, Todd McFarland <toddmcf2002@gmail.com
> > >wrote:
> >
> > > Hi folks,
> > >
> > > (Resending to this group, sent to common-dev before, pretty sure that's
> > for
> > > Hadoop internal development - sorry for that..)
> > >
> > > I'm pretty stuck here. I've been researching for hours and I haven't
> > made
> > > any forward progress on this one.
> > >
> > > I have a vmWare installation of Cloudera Hadoop 0.20. The following
> > > commands to create a directory and copy a file from the shared folder
> > *work
> > > fine*, so I'm confident everything is setup correctly:
> > >
> > > [cloudera@localhost bin]$ hadoop fs -mkdir /user/cloudera/testdir
> > > [cloudera@localhost bin]$ hadoop fs -put
> > /mnt/hgfs/shared_folder/file1.txt
> > > /user/cloudera/testdir/file1.txt
> > >
> > > The file shows up fine in the HDFS doing it this way on the Linux VM.
> > >
> > > *However*, when I try doing the equivalent operation in Java everything
> > > works great until I try to close() FSDataOutputStream.
> > > I'm left with the new directory and a zero byte size file. One
> > suspicious
> > > thing is that the user is "admin" instead of "cloudera" which I haven't
> > > figured out why. Here is the error:
> > >
> > > 12/05/19 09:45:46 INFO hdfs.DFSClient: Exception in
> > createBlockOutputStream
> > > 127.0.0.1:50010 java.net.ConnectException: Connection refused: no
> > further
> > > information
> > > 12/05/19 09:45:46 INFO hdfs.DFSClient: Abandoning block
> > > blk_1931357292676354131_1068
> > > 12/05/19 09:45:46 INFO hdfs.DFSClient: Excluding datanode
> > 127.0.0.1:50010
> > > 12/05/19 09:45:46 WARN hdfs.DFSClient: DataStreamer Exception:
> > > org.apache.hadoop.ipc.RemoteException: java.io.IOException: File
> > > /user/admin/testdir/file1.txt could only be replicated to 0 nodes,
> > instead
> > > of 1
> > > at
> > >
> > >
> >
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1533)
> > > at
> > >
> >
> org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:667)
> > > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> > > at
> > >
> > >
> >
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> > > at
> > >
> > >
> >
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> > >
> > > There are certainly lots of search references to "*could only be
> > replicated
> > > to 0 nodes, instead of 1*" but chasing down those suggestions hasn't
> > > helped.
> > > I have run *jps* and* netstat* and that looks good. All services are
> > > running, all port seem to be good. The *health check* looks good,
> plenty
> > > of disk space, no failed nodes...
> > >
> > > Here is the java (it fails when it hits "fs.close()":
> > >
> > > import java.io.BufferedReader;
> > > import java.io.FileInputStream;
> > > import java.io.FileReader;
> > > import java.io.IOException;
> > > import org.apache.hadoop.conf.Configuration;
> > > import org.apache.hadoop.fs.FSDataInputStream;
> > > import org.apache.hadoop.fs.FSDataOutputStream;
> > > import org.apache.hadoop.fs.FileSystem;
> > > import org.apache.hadoop.fs.Path;
> > >
> > > public class TestFileTrans {
> > >
> > > public static void main(String[] args) {
> > >
> > > Configuration config = new Configuration();
> > >
> > > config.addResource(new
> > > Path("c:/_bigdata/client_libs/core-site.xml"));
> > > config.addResource(new
> > > Path("c:/_bigdata/client_libs/hdfs-site.xml"));
> > >
> > > System.out.println("hadoop.tmp.dir: " +
> > > config.get("hadoop.tmp.dir"));
> > > try{
> > > FileSystem dfs = FileSystem.get(config);
> > >
> > > // this will default to admin unless the workingDirectory is
> > > explicitly set..
> > >
> > > System.out.println("HDFS Working Directory: " +
> > > dfs.getWorkingDirectory().toString());
> > >
> > > String dirName = "testdir";
> > > Path src = new Path(dfs.getWorkingDirectory()+"/"+dirName);
> > > dfs.mkdirs(src);
> > >
> > > System.out.println("HDFS Directory created: " +
> > > dfs.getWorkingDirectory().toString());
> > >
> > > loadFile(dfs, src);
> > >
> > > }catch(IOException e){
> > > System.out.println("Error" + e.getMessage());
> > > }
> > >
> > > }
> > >
> > > private static void loadFile(FileSystem dfs, Path src) throws
> > > IOException{
> > >
> > > FileInputStream fis = new
> > > FileInputStream("c:/_bigdata/shared_folder/file1.txt");
> > >
> > > int len = fis.available();
> > >
> > > byte[] btr = new byte[len];
> > >
> > > fis.read(btr);
> > >
> > > FSDataOutputStream fs = dfs.create(new Path(src.toString()
> > > +"/file1.txt"));
> > >
> > > fs.write(btr);
> > >
> > > fs.flush();
> > > fs.close();
> > >
> > > }
> > > }
> > >
> > > Any help would be greatly appreciated!
> > >
> >
>
Re: RemoteException writing files
Posted by Todd McFarland <to...@gmail.com>.
Thanks for the links. The behavior is as the links describe but bottom
line it works fine if I'm copying these files on the Linux VMWare instance
via the command line.
Using my java program remotely, it simply doesn't work. All I can think of
is that there is some property on the Java side (in Windows 7) that is
telling Hadoop (in VMware Linux) to do the block replication differently
than what it does when the operation is run locally via the command line.
This is a frustrating problem. I'm sure its a 10 second fix if I can find
the right property to set in the Configuration class.
This is what I have loaded into the Configuration class so far:
config.addResource(new Path("c:/_bigdata/client_libs/core-site.xml"));
config.addResource(new Path("c:/_bigdata/client_libs/hdfs-site.xml"));
config.addResource(new Path("c:/_bigdata/client_libs/mapred-site.xml"));
//config.set("dfs.replication", "1");
//config.set("dfs.datanode.address", "192.168.60.128:50010");
Setting "dfs.replication=1" is the default setting from hdfs-site.xml so
that didn't do anything. I tried to override the dfs.datanode.address in
case "127.0.0.1:50010" was the issue but it gets overridden on the Linux
end apparently.
How do I override 127.0.0.1 to localhost? What config file?
-------------------------------------------------------------------------
On Sat, May 19, 2012 at 2:00 PM, samir das mohapatra <
samir.helpdoc@gmail.com> wrote:
> Hi
> This Could be due to the Following reason
>
> 1) The *NameNode <http://wiki.apache.org/hadoop/NameNode>* does not have
> any available DataNodes
> 2) Namenode not able to start properly
> 3) other wise some IP Issue .
> Note:- Pleaes mention localhost instead of 127.0.0.1 (If it is in
> local)
>
> Follow URL:
>
> http://wiki.apache.org/hadoop/FAQ#What_does_.22file_could_only_be_replicated_to_0_nodes.2C_instead_of_1.22_mean.3F
>
>
> Thanks
> samir
>
>
> On Sat, May 19, 2012 at 8:59 PM, Todd McFarland <toddmcf2002@gmail.com
> >wrote:
>
> > Hi folks,
> >
> > (Resending to this group, sent to common-dev before, pretty sure that's
> for
> > Hadoop internal development - sorry for that..)
> >
> > I'm pretty stuck here. I've been researching for hours and I haven't
> made
> > any forward progress on this one.
> >
> > I have a vmWare installation of Cloudera Hadoop 0.20. The following
> > commands to create a directory and copy a file from the shared folder
> *work
> > fine*, so I'm confident everything is setup correctly:
> >
> > [cloudera@localhost bin]$ hadoop fs -mkdir /user/cloudera/testdir
> > [cloudera@localhost bin]$ hadoop fs -put
> /mnt/hgfs/shared_folder/file1.txt
> > /user/cloudera/testdir/file1.txt
> >
> > The file shows up fine in the HDFS doing it this way on the Linux VM.
> >
> > *However*, when I try doing the equivalent operation in Java everything
> > works great until I try to close() FSDataOutputStream.
> > I'm left with the new directory and a zero byte size file. One
> suspicious
> > thing is that the user is "admin" instead of "cloudera" which I haven't
> > figured out why. Here is the error:
> >
> > 12/05/19 09:45:46 INFO hdfs.DFSClient: Exception in
> createBlockOutputStream
> > 127.0.0.1:50010 java.net.ConnectException: Connection refused: no
> further
> > information
> > 12/05/19 09:45:46 INFO hdfs.DFSClient: Abandoning block
> > blk_1931357292676354131_1068
> > 12/05/19 09:45:46 INFO hdfs.DFSClient: Excluding datanode
> 127.0.0.1:50010
> > 12/05/19 09:45:46 WARN hdfs.DFSClient: DataStreamer Exception:
> > org.apache.hadoop.ipc.RemoteException: java.io.IOException: File
> > /user/admin/testdir/file1.txt could only be replicated to 0 nodes,
> instead
> > of 1
> > at
> >
> >
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1533)
> > at
> >
> org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:667)
> > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> > at
> >
> >
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> > at
> >
> >
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> >
> > There are certainly lots of search references to "*could only be
> replicated
> > to 0 nodes, instead of 1*" but chasing down those suggestions hasn't
> > helped.
> > I have run *jps* and* netstat* and that looks good. All services are
> > running, all port seem to be good. The *health check* looks good, plenty
> > of disk space, no failed nodes...
> >
> > Here is the java (it fails when it hits "fs.close()":
> >
> > import java.io.BufferedReader;
> > import java.io.FileInputStream;
> > import java.io.FileReader;
> > import java.io.IOException;
> > import org.apache.hadoop.conf.Configuration;
> > import org.apache.hadoop.fs.FSDataInputStream;
> > import org.apache.hadoop.fs.FSDataOutputStream;
> > import org.apache.hadoop.fs.FileSystem;
> > import org.apache.hadoop.fs.Path;
> >
> > public class TestFileTrans {
> >
> > public static void main(String[] args) {
> >
> > Configuration config = new Configuration();
> >
> > config.addResource(new
> > Path("c:/_bigdata/client_libs/core-site.xml"));
> > config.addResource(new
> > Path("c:/_bigdata/client_libs/hdfs-site.xml"));
> >
> > System.out.println("hadoop.tmp.dir: " +
> > config.get("hadoop.tmp.dir"));
> > try{
> > FileSystem dfs = FileSystem.get(config);
> >
> > // this will default to admin unless the workingDirectory is
> > explicitly set..
> >
> > System.out.println("HDFS Working Directory: " +
> > dfs.getWorkingDirectory().toString());
> >
> > String dirName = "testdir";
> > Path src = new Path(dfs.getWorkingDirectory()+"/"+dirName);
> > dfs.mkdirs(src);
> >
> > System.out.println("HDFS Directory created: " +
> > dfs.getWorkingDirectory().toString());
> >
> > loadFile(dfs, src);
> >
> > }catch(IOException e){
> > System.out.println("Error" + e.getMessage());
> > }
> >
> > }
> >
> > private static void loadFile(FileSystem dfs, Path src) throws
> > IOException{
> >
> > FileInputStream fis = new
> > FileInputStream("c:/_bigdata/shared_folder/file1.txt");
> >
> > int len = fis.available();
> >
> > byte[] btr = new byte[len];
> >
> > fis.read(btr);
> >
> > FSDataOutputStream fs = dfs.create(new Path(src.toString()
> > +"/file1.txt"));
> >
> > fs.write(btr);
> >
> > fs.flush();
> > fs.close();
> >
> > }
> > }
> >
> > Any help would be greatly appreciated!
> >
>
Re: RemoteException writing files
Posted by samir das mohapatra <sa...@gmail.com>.
Hi
This Could be due to the Following reason
1) The *NameNode <http://wiki.apache.org/hadoop/NameNode>* does not have
any available DataNodes
2) Namenode not able to start properly
3) other wise some IP Issue .
Note:- Pleaes mention localhost instead of 127.0.0.1 (If it is in
local)
Follow URL:
http://wiki.apache.org/hadoop/FAQ#What_does_.22file_could_only_be_replicated_to_0_nodes.2C_instead_of_1.22_mean.3F
Thanks
samir
On Sat, May 19, 2012 at 8:59 PM, Todd McFarland <to...@gmail.com>wrote:
> Hi folks,
>
> (Resending to this group, sent to common-dev before, pretty sure that's for
> Hadoop internal development - sorry for that..)
>
> I'm pretty stuck here. I've been researching for hours and I haven't made
> any forward progress on this one.
>
> I have a vmWare installation of Cloudera Hadoop 0.20. The following
> commands to create a directory and copy a file from the shared folder *work
> fine*, so I'm confident everything is setup correctly:
>
> [cloudera@localhost bin]$ hadoop fs -mkdir /user/cloudera/testdir
> [cloudera@localhost bin]$ hadoop fs -put /mnt/hgfs/shared_folder/file1.txt
> /user/cloudera/testdir/file1.txt
>
> The file shows up fine in the HDFS doing it this way on the Linux VM.
>
> *However*, when I try doing the equivalent operation in Java everything
> works great until I try to close() FSDataOutputStream.
> I'm left with the new directory and a zero byte size file. One suspicious
> thing is that the user is "admin" instead of "cloudera" which I haven't
> figured out why. Here is the error:
>
> 12/05/19 09:45:46 INFO hdfs.DFSClient: Exception in createBlockOutputStream
> 127.0.0.1:50010 java.net.ConnectException: Connection refused: no further
> information
> 12/05/19 09:45:46 INFO hdfs.DFSClient: Abandoning block
> blk_1931357292676354131_1068
> 12/05/19 09:45:46 INFO hdfs.DFSClient: Excluding datanode 127.0.0.1:50010
> 12/05/19 09:45:46 WARN hdfs.DFSClient: DataStreamer Exception:
> org.apache.hadoop.ipc.RemoteException: java.io.IOException: File
> /user/admin/testdir/file1.txt could only be replicated to 0 nodes, instead
> of 1
> at
>
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1533)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:667)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
>
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
>
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>
> There are certainly lots of search references to "*could only be replicated
> to 0 nodes, instead of 1*" but chasing down those suggestions hasn't
> helped.
> I have run *jps* and* netstat* and that looks good. All services are
> running, all port seem to be good. The *health check* looks good, plenty
> of disk space, no failed nodes...
>
> Here is the java (it fails when it hits "fs.close()":
>
> import java.io.BufferedReader;
> import java.io.FileInputStream;
> import java.io.FileReader;
> import java.io.IOException;
> import org.apache.hadoop.conf.Configuration;
> import org.apache.hadoop.fs.FSDataInputStream;
> import org.apache.hadoop.fs.FSDataOutputStream;
> import org.apache.hadoop.fs.FileSystem;
> import org.apache.hadoop.fs.Path;
>
> public class TestFileTrans {
>
> public static void main(String[] args) {
>
> Configuration config = new Configuration();
>
> config.addResource(new
> Path("c:/_bigdata/client_libs/core-site.xml"));
> config.addResource(new
> Path("c:/_bigdata/client_libs/hdfs-site.xml"));
>
> System.out.println("hadoop.tmp.dir: " +
> config.get("hadoop.tmp.dir"));
> try{
> FileSystem dfs = FileSystem.get(config);
>
> // this will default to admin unless the workingDirectory is
> explicitly set..
>
> System.out.println("HDFS Working Directory: " +
> dfs.getWorkingDirectory().toString());
>
> String dirName = "testdir";
> Path src = new Path(dfs.getWorkingDirectory()+"/"+dirName);
> dfs.mkdirs(src);
>
> System.out.println("HDFS Directory created: " +
> dfs.getWorkingDirectory().toString());
>
> loadFile(dfs, src);
>
> }catch(IOException e){
> System.out.println("Error" + e.getMessage());
> }
>
> }
>
> private static void loadFile(FileSystem dfs, Path src) throws
> IOException{
>
> FileInputStream fis = new
> FileInputStream("c:/_bigdata/shared_folder/file1.txt");
>
> int len = fis.available();
>
> byte[] btr = new byte[len];
>
> fis.read(btr);
>
> FSDataOutputStream fs = dfs.create(new Path(src.toString()
> +"/file1.txt"));
>
> fs.write(btr);
>
> fs.flush();
> fs.close();
>
> }
> }
>
> Any help would be greatly appreciated!
>