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Posted to mapreduce-user@hadoop.apache.org by Pedro Sa da Costa <ps...@gmail.com> on 2014/01/09 11:35:29 UTC
org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeExceptio
When I try to launch the namenode and the datanode in MRv2, the datanode
can't connect to the namenode, giving me the error below. I also put the
core-site file that I use below.
The Firewall in the hosts is disabled. I don't have excluded nodes
defined. Why the datanodes can't connect to the namenode? Any help to
solve this problem?
org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException):
Datanode denied communication with namenode: DatanodeRegistrati
on(0.0.0.0, storageID=DS-1449645935-172.16.1.10-50010-1389224474955,
infoPort=50075, ipcPort=50020,
storageInfo=lv=-40;cid=CID-9a8571a3-17ae-49b2-b957-b009e88b9f9a;nsid=9
34416283;c=0)
at
org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager.registerDatanode(DatanodeManager.java:631)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.registerDatanode(FSNamesystem.java:3398)
at
org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.registerDatanode(NameNodeRpcServer.java:881)
at
org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolServerSideTranslatorPB.registerDatanode(DatanodeProtocolServerSideTranslatorPB.java:90)
at
org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos$DatanodeProtocolService$2.callBlockingMethod(DatanodeProtocolProtos.java:18295)
at
org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:454)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1014)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1741)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1737)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:416)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1478)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1735)
at org.apache.hadoop.ipc.Client.call(Client.java:1235)
at
org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:202)
at com.sun.proxy.$Proxy9.registerDatanode(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:622)
at
org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:164)
at
org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:83)
at com.sun.proxy.$Proxy9.registerDatanode(Unknown Source)
at
org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB.registerDatanode(DatanodeProtocolClientSideTranslatorPB.java:146)
at
org.apache.hadoop.hdfs.server.datanode.BPServiceActor.register(BPServiceActor.java:623)
at
org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:225)
at
org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:664)
at java.lang.Thread.run(Thread.java:701)
I set the core-site.xml
<configuration>
<property> <name>fs.default.name <http://fs.default.name></name>
<value>hdfs://10.103.0.17:9000 <http://10.103.0.17:9000></value> </property>
<property> <name>hadoop.tmp.dir</name>
<value>/tmp/hadoop-temp</value> </property>
<property><name>hadoop.proxyuser.root.hosts</name><value>*</value></property>
<property><name>hadoop.proxyuser.root.groups</name><value>*</value></property>
</configuration>
--
Best regards,
Re: org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeExceptio
Posted by Pedro Sa da Costa <ps...@gmail.com>.
My hdfs-site.xml and dfs.include file have the following:
172:~/Programs/hadoop-mapreduce-manager-python# cat
../hadoop/etc/hadoop/hdfs-site.xml
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property> <name>dfs.replication</name> <value>1</value>
</property>
<property> <name>dfs.permissions</name> <value>false</value>
</property>
<property> <name>dfs.name.dir</name>
<value>/tmp/data/dfs/name/</value> </property>
<property> <name>dfs.data.dir</name>
<value>/tmp/data/dfs/data/</value> </property>
<property> <name>dfs.hosts</name>
<value>/root/Programs/hadoop/etc/hadoop/dfs.include</value> </property>
</configuration>
172:~/Programs/hadoop-mapreduce-manager-python# cat
/root/Programs/hadoop/etc/hadoop/dfs.include
172.16.XXX.XXX
172.16.XXX.XXX
172.16.XXX.XXX
172.16.XXX.XXX
But I still get the Exception. What is missing?
On 01/09/2014 11:26 AM, Harsh J wrote:
> Your hdfs-site.xml on the NN defines an "includes" file, but the
> includes file does not list this connecting DN's proper hostname/IP,
> causing the NN to reject it when it tries to ask itself to be
> registered upon startup.
>
> On Thu, Jan 9, 2014 at 4:05 PM, Pedro Sa da Costa <ps...@gmail.com> wrote:
>> When I try to launch the namenode and the datanode in MRv2, the datanode
>> can't connect to the namenode, giving me the error below. I also put the
>> core-site file that I use below.
>>
>> The Firewall in the hosts is disabled. I don't have excluded nodes defined.
>> Why the datanodes can't connect to the namenode? Any help to solve this
>> problem?
>>
>>
>> org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException):
>> Datanode denied communication with namenode: DatanodeRegistrati
>> on(0.0.0.0, storageID=DS-1449645935-172.16.1.10-50010-1389224474955,
>> infoPort=50075, ipcPort=50020,
>> storageInfo=lv=-40;cid=CID-9a8571a3-17ae-49b2-b957-b009e88b9f9a;nsid=9
>> 34416283;c=0)
>> at
>> org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager.registerDatanode(DatanodeManager.java:631)
>> at
>> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.registerDatanode(FSNamesystem.java:3398)
>> at
>> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.registerDatanode(NameNodeRpcServer.java:881)
>> at
>> org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolServerSideTranslatorPB.registerDatanode(DatanodeProtocolServerSideTranslatorPB.java:90)
>> at
>> org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos$DatanodeProtocolService$2.callBlockingMethod(DatanodeProtocolProtos.java:18295)
>> at
>> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:454)
>> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1014)
>> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1741)
>> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1737)
>> at java.security.AccessController.doPrivileged(Native Method)
>> at javax.security.auth.Subject.doAs(Subject.java:416)
>> at
>> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1478)
>> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1735)
>>
>> at org.apache.hadoop.ipc.Client.call(Client.java:1235)
>> at
>> org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:202)
>> at com.sun.proxy.$Proxy9.registerDatanode(Unknown Source)
>> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>> at
>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>> at
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>> at java.lang.reflect.Method.invoke(Method.java:622)
>> at
>> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:164)
>> at
>> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:83)
>> at com.sun.proxy.$Proxy9.registerDatanode(Unknown Source)
>> at
>> org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB.registerDatanode(DatanodeProtocolClientSideTranslatorPB.java:146)
>> at
>> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.register(BPServiceActor.java:623)
>> at
>> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:225)
>> at
>> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:664)
>> at java.lang.Thread.run(Thread.java:701)
>>
>> I set the core-site.xml
>>
>> <configuration>
>> <property> <name>fs.default.name</name>
>> <value>hdfs://10.103.0.17:9000</value> </property>
>> <property> <name>hadoop.tmp.dir</name> <value>/tmp/hadoop-temp</value>
>> </property>
>>
>> <property><name>hadoop.proxyuser.root.hosts</name><value>*</value></property>
>>
>> <property><name>hadoop.proxyuser.root.groups</name><value>*</value></property>
>> </configuration>
>>
>> --
>> Best regards,
>
>
--
Best regards,
Re: org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeExceptio
Posted by Pedro Sa da Costa <ps...@gmail.com>.
My hdfs-site.xml and dfs.include file have the following:
172:~/Programs/hadoop-mapreduce-manager-python# cat
../hadoop/etc/hadoop/hdfs-site.xml
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property> <name>dfs.replication</name> <value>1</value>
</property>
<property> <name>dfs.permissions</name> <value>false</value>
</property>
<property> <name>dfs.name.dir</name>
<value>/tmp/data/dfs/name/</value> </property>
<property> <name>dfs.data.dir</name>
<value>/tmp/data/dfs/data/</value> </property>
<property> <name>dfs.hosts</name>
<value>/root/Programs/hadoop/etc/hadoop/dfs.include</value> </property>
</configuration>
172:~/Programs/hadoop-mapreduce-manager-python# cat
/root/Programs/hadoop/etc/hadoop/dfs.include
172.16.XXX.XXX
172.16.XXX.XXX
172.16.XXX.XXX
172.16.XXX.XXX
But I still get the Exception. What is missing?
On 01/09/2014 11:26 AM, Harsh J wrote:
> Your hdfs-site.xml on the NN defines an "includes" file, but the
> includes file does not list this connecting DN's proper hostname/IP,
> causing the NN to reject it when it tries to ask itself to be
> registered upon startup.
>
> On Thu, Jan 9, 2014 at 4:05 PM, Pedro Sa da Costa <ps...@gmail.com> wrote:
>> When I try to launch the namenode and the datanode in MRv2, the datanode
>> can't connect to the namenode, giving me the error below. I also put the
>> core-site file that I use below.
>>
>> The Firewall in the hosts is disabled. I don't have excluded nodes defined.
>> Why the datanodes can't connect to the namenode? Any help to solve this
>> problem?
>>
>>
>> org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException):
>> Datanode denied communication with namenode: DatanodeRegistrati
>> on(0.0.0.0, storageID=DS-1449645935-172.16.1.10-50010-1389224474955,
>> infoPort=50075, ipcPort=50020,
>> storageInfo=lv=-40;cid=CID-9a8571a3-17ae-49b2-b957-b009e88b9f9a;nsid=9
>> 34416283;c=0)
>> at
>> org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager.registerDatanode(DatanodeManager.java:631)
>> at
>> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.registerDatanode(FSNamesystem.java:3398)
>> at
>> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.registerDatanode(NameNodeRpcServer.java:881)
>> at
>> org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolServerSideTranslatorPB.registerDatanode(DatanodeProtocolServerSideTranslatorPB.java:90)
>> at
>> org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos$DatanodeProtocolService$2.callBlockingMethod(DatanodeProtocolProtos.java:18295)
>> at
>> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:454)
>> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1014)
>> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1741)
>> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1737)
>> at java.security.AccessController.doPrivileged(Native Method)
>> at javax.security.auth.Subject.doAs(Subject.java:416)
>> at
>> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1478)
>> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1735)
>>
>> at org.apache.hadoop.ipc.Client.call(Client.java:1235)
>> at
>> org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:202)
>> at com.sun.proxy.$Proxy9.registerDatanode(Unknown Source)
>> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>> at
>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>> at
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>> at java.lang.reflect.Method.invoke(Method.java:622)
>> at
>> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:164)
>> at
>> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:83)
>> at com.sun.proxy.$Proxy9.registerDatanode(Unknown Source)
>> at
>> org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB.registerDatanode(DatanodeProtocolClientSideTranslatorPB.java:146)
>> at
>> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.register(BPServiceActor.java:623)
>> at
>> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:225)
>> at
>> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:664)
>> at java.lang.Thread.run(Thread.java:701)
>>
>> I set the core-site.xml
>>
>> <configuration>
>> <property> <name>fs.default.name</name>
>> <value>hdfs://10.103.0.17:9000</value> </property>
>> <property> <name>hadoop.tmp.dir</name> <value>/tmp/hadoop-temp</value>
>> </property>
>>
>> <property><name>hadoop.proxyuser.root.hosts</name><value>*</value></property>
>>
>> <property><name>hadoop.proxyuser.root.groups</name><value>*</value></property>
>> </configuration>
>>
>> --
>> Best regards,
>
>
--
Best regards,
Re: org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeExceptio
Posted by Pedro Sa da Costa <ps...@gmail.com>.
My hdfs-site.xml and dfs.include file have the following:
172:~/Programs/hadoop-mapreduce-manager-python# cat
../hadoop/etc/hadoop/hdfs-site.xml
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property> <name>dfs.replication</name> <value>1</value>
</property>
<property> <name>dfs.permissions</name> <value>false</value>
</property>
<property> <name>dfs.name.dir</name>
<value>/tmp/data/dfs/name/</value> </property>
<property> <name>dfs.data.dir</name>
<value>/tmp/data/dfs/data/</value> </property>
<property> <name>dfs.hosts</name>
<value>/root/Programs/hadoop/etc/hadoop/dfs.include</value> </property>
</configuration>
172:~/Programs/hadoop-mapreduce-manager-python# cat
/root/Programs/hadoop/etc/hadoop/dfs.include
172.16.XXX.XXX
172.16.XXX.XXX
172.16.XXX.XXX
172.16.XXX.XXX
But I still get the Exception. What is missing?
On 01/09/2014 11:26 AM, Harsh J wrote:
> Your hdfs-site.xml on the NN defines an "includes" file, but the
> includes file does not list this connecting DN's proper hostname/IP,
> causing the NN to reject it when it tries to ask itself to be
> registered upon startup.
>
> On Thu, Jan 9, 2014 at 4:05 PM, Pedro Sa da Costa <ps...@gmail.com> wrote:
>> When I try to launch the namenode and the datanode in MRv2, the datanode
>> can't connect to the namenode, giving me the error below. I also put the
>> core-site file that I use below.
>>
>> The Firewall in the hosts is disabled. I don't have excluded nodes defined.
>> Why the datanodes can't connect to the namenode? Any help to solve this
>> problem?
>>
>>
>> org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException):
>> Datanode denied communication with namenode: DatanodeRegistrati
>> on(0.0.0.0, storageID=DS-1449645935-172.16.1.10-50010-1389224474955,
>> infoPort=50075, ipcPort=50020,
>> storageInfo=lv=-40;cid=CID-9a8571a3-17ae-49b2-b957-b009e88b9f9a;nsid=9
>> 34416283;c=0)
>> at
>> org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager.registerDatanode(DatanodeManager.java:631)
>> at
>> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.registerDatanode(FSNamesystem.java:3398)
>> at
>> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.registerDatanode(NameNodeRpcServer.java:881)
>> at
>> org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolServerSideTranslatorPB.registerDatanode(DatanodeProtocolServerSideTranslatorPB.java:90)
>> at
>> org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos$DatanodeProtocolService$2.callBlockingMethod(DatanodeProtocolProtos.java:18295)
>> at
>> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:454)
>> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1014)
>> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1741)
>> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1737)
>> at java.security.AccessController.doPrivileged(Native Method)
>> at javax.security.auth.Subject.doAs(Subject.java:416)
>> at
>> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1478)
>> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1735)
>>
>> at org.apache.hadoop.ipc.Client.call(Client.java:1235)
>> at
>> org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:202)
>> at com.sun.proxy.$Proxy9.registerDatanode(Unknown Source)
>> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>> at
>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>> at
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>> at java.lang.reflect.Method.invoke(Method.java:622)
>> at
>> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:164)
>> at
>> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:83)
>> at com.sun.proxy.$Proxy9.registerDatanode(Unknown Source)
>> at
>> org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB.registerDatanode(DatanodeProtocolClientSideTranslatorPB.java:146)
>> at
>> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.register(BPServiceActor.java:623)
>> at
>> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:225)
>> at
>> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:664)
>> at java.lang.Thread.run(Thread.java:701)
>>
>> I set the core-site.xml
>>
>> <configuration>
>> <property> <name>fs.default.name</name>
>> <value>hdfs://10.103.0.17:9000</value> </property>
>> <property> <name>hadoop.tmp.dir</name> <value>/tmp/hadoop-temp</value>
>> </property>
>>
>> <property><name>hadoop.proxyuser.root.hosts</name><value>*</value></property>
>>
>> <property><name>hadoop.proxyuser.root.groups</name><value>*</value></property>
>> </configuration>
>>
>> --
>> Best regards,
>
>
--
Best regards,
Re: org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeExceptio
Posted by Pedro Sa da Costa <ps...@gmail.com>.
My hdfs-site.xml and dfs.include file have the following:
172:~/Programs/hadoop-mapreduce-manager-python# cat
../hadoop/etc/hadoop/hdfs-site.xml
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property> <name>dfs.replication</name> <value>1</value>
</property>
<property> <name>dfs.permissions</name> <value>false</value>
</property>
<property> <name>dfs.name.dir</name>
<value>/tmp/data/dfs/name/</value> </property>
<property> <name>dfs.data.dir</name>
<value>/tmp/data/dfs/data/</value> </property>
<property> <name>dfs.hosts</name>
<value>/root/Programs/hadoop/etc/hadoop/dfs.include</value> </property>
</configuration>
172:~/Programs/hadoop-mapreduce-manager-python# cat
/root/Programs/hadoop/etc/hadoop/dfs.include
172.16.XXX.XXX
172.16.XXX.XXX
172.16.XXX.XXX
172.16.XXX.XXX
But I still get the Exception. What is missing?
On 01/09/2014 11:26 AM, Harsh J wrote:
> Your hdfs-site.xml on the NN defines an "includes" file, but the
> includes file does not list this connecting DN's proper hostname/IP,
> causing the NN to reject it when it tries to ask itself to be
> registered upon startup.
>
> On Thu, Jan 9, 2014 at 4:05 PM, Pedro Sa da Costa <ps...@gmail.com> wrote:
>> When I try to launch the namenode and the datanode in MRv2, the datanode
>> can't connect to the namenode, giving me the error below. I also put the
>> core-site file that I use below.
>>
>> The Firewall in the hosts is disabled. I don't have excluded nodes defined.
>> Why the datanodes can't connect to the namenode? Any help to solve this
>> problem?
>>
>>
>> org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException):
>> Datanode denied communication with namenode: DatanodeRegistrati
>> on(0.0.0.0, storageID=DS-1449645935-172.16.1.10-50010-1389224474955,
>> infoPort=50075, ipcPort=50020,
>> storageInfo=lv=-40;cid=CID-9a8571a3-17ae-49b2-b957-b009e88b9f9a;nsid=9
>> 34416283;c=0)
>> at
>> org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager.registerDatanode(DatanodeManager.java:631)
>> at
>> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.registerDatanode(FSNamesystem.java:3398)
>> at
>> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.registerDatanode(NameNodeRpcServer.java:881)
>> at
>> org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolServerSideTranslatorPB.registerDatanode(DatanodeProtocolServerSideTranslatorPB.java:90)
>> at
>> org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos$DatanodeProtocolService$2.callBlockingMethod(DatanodeProtocolProtos.java:18295)
>> at
>> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:454)
>> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1014)
>> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1741)
>> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1737)
>> at java.security.AccessController.doPrivileged(Native Method)
>> at javax.security.auth.Subject.doAs(Subject.java:416)
>> at
>> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1478)
>> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1735)
>>
>> at org.apache.hadoop.ipc.Client.call(Client.java:1235)
>> at
>> org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:202)
>> at com.sun.proxy.$Proxy9.registerDatanode(Unknown Source)
>> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>> at
>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>> at
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>> at java.lang.reflect.Method.invoke(Method.java:622)
>> at
>> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:164)
>> at
>> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:83)
>> at com.sun.proxy.$Proxy9.registerDatanode(Unknown Source)
>> at
>> org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB.registerDatanode(DatanodeProtocolClientSideTranslatorPB.java:146)
>> at
>> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.register(BPServiceActor.java:623)
>> at
>> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:225)
>> at
>> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:664)
>> at java.lang.Thread.run(Thread.java:701)
>>
>> I set the core-site.xml
>>
>> <configuration>
>> <property> <name>fs.default.name</name>
>> <value>hdfs://10.103.0.17:9000</value> </property>
>> <property> <name>hadoop.tmp.dir</name> <value>/tmp/hadoop-temp</value>
>> </property>
>>
>> <property><name>hadoop.proxyuser.root.hosts</name><value>*</value></property>
>>
>> <property><name>hadoop.proxyuser.root.groups</name><value>*</value></property>
>> </configuration>
>>
>> --
>> Best regards,
>
>
--
Best regards,
Re: org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeExceptio
Posted by Harsh J <ha...@cloudera.com>.
Your hdfs-site.xml on the NN defines an "includes" file, but the
includes file does not list this connecting DN's proper hostname/IP,
causing the NN to reject it when it tries to ask itself to be
registered upon startup.
On Thu, Jan 9, 2014 at 4:05 PM, Pedro Sa da Costa <ps...@gmail.com> wrote:
>
> When I try to launch the namenode and the datanode in MRv2, the datanode
> can't connect to the namenode, giving me the error below. I also put the
> core-site file that I use below.
>
> The Firewall in the hosts is disabled. I don't have excluded nodes defined.
> Why the datanodes can't connect to the namenode? Any help to solve this
> problem?
>
>
> org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException):
> Datanode denied communication with namenode: DatanodeRegistrati
> on(0.0.0.0, storageID=DS-1449645935-172.16.1.10-50010-1389224474955,
> infoPort=50075, ipcPort=50020,
> storageInfo=lv=-40;cid=CID-9a8571a3-17ae-49b2-b957-b009e88b9f9a;nsid=9
> 34416283;c=0)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager.registerDatanode(DatanodeManager.java:631)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.registerDatanode(FSNamesystem.java:3398)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.registerDatanode(NameNodeRpcServer.java:881)
> at
> org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolServerSideTranslatorPB.registerDatanode(DatanodeProtocolServerSideTranslatorPB.java:90)
> at
> org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos$DatanodeProtocolService$2.callBlockingMethod(DatanodeProtocolProtos.java:18295)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:454)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1014)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1741)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1737)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:416)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1478)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1735)
>
> at org.apache.hadoop.ipc.Client.call(Client.java:1235)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:202)
> at com.sun.proxy.$Proxy9.registerDatanode(Unknown Source)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:622)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:164)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:83)
> at com.sun.proxy.$Proxy9.registerDatanode(Unknown Source)
> at
> org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB.registerDatanode(DatanodeProtocolClientSideTranslatorPB.java:146)
> at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.register(BPServiceActor.java:623)
> at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:225)
> at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:664)
> at java.lang.Thread.run(Thread.java:701)
>
> I set the core-site.xml
>
> <configuration>
> <property> <name>fs.default.name</name>
> <value>hdfs://10.103.0.17:9000</value> </property>
> <property> <name>hadoop.tmp.dir</name> <value>/tmp/hadoop-temp</value>
> </property>
>
> <property><name>hadoop.proxyuser.root.hosts</name><value>*</value></property>
>
> <property><name>hadoop.proxyuser.root.groups</name><value>*</value></property>
> </configuration>
>
> --
> Best regards,
--
Harsh J
Re: org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeExceptio
Posted by Harsh J <ha...@cloudera.com>.
Your hdfs-site.xml on the NN defines an "includes" file, but the
includes file does not list this connecting DN's proper hostname/IP,
causing the NN to reject it when it tries to ask itself to be
registered upon startup.
On Thu, Jan 9, 2014 at 4:05 PM, Pedro Sa da Costa <ps...@gmail.com> wrote:
>
> When I try to launch the namenode and the datanode in MRv2, the datanode
> can't connect to the namenode, giving me the error below. I also put the
> core-site file that I use below.
>
> The Firewall in the hosts is disabled. I don't have excluded nodes defined.
> Why the datanodes can't connect to the namenode? Any help to solve this
> problem?
>
>
> org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException):
> Datanode denied communication with namenode: DatanodeRegistrati
> on(0.0.0.0, storageID=DS-1449645935-172.16.1.10-50010-1389224474955,
> infoPort=50075, ipcPort=50020,
> storageInfo=lv=-40;cid=CID-9a8571a3-17ae-49b2-b957-b009e88b9f9a;nsid=9
> 34416283;c=0)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager.registerDatanode(DatanodeManager.java:631)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.registerDatanode(FSNamesystem.java:3398)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.registerDatanode(NameNodeRpcServer.java:881)
> at
> org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolServerSideTranslatorPB.registerDatanode(DatanodeProtocolServerSideTranslatorPB.java:90)
> at
> org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos$DatanodeProtocolService$2.callBlockingMethod(DatanodeProtocolProtos.java:18295)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:454)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1014)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1741)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1737)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:416)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1478)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1735)
>
> at org.apache.hadoop.ipc.Client.call(Client.java:1235)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:202)
> at com.sun.proxy.$Proxy9.registerDatanode(Unknown Source)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:622)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:164)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:83)
> at com.sun.proxy.$Proxy9.registerDatanode(Unknown Source)
> at
> org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB.registerDatanode(DatanodeProtocolClientSideTranslatorPB.java:146)
> at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.register(BPServiceActor.java:623)
> at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:225)
> at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:664)
> at java.lang.Thread.run(Thread.java:701)
>
> I set the core-site.xml
>
> <configuration>
> <property> <name>fs.default.name</name>
> <value>hdfs://10.103.0.17:9000</value> </property>
> <property> <name>hadoop.tmp.dir</name> <value>/tmp/hadoop-temp</value>
> </property>
>
> <property><name>hadoop.proxyuser.root.hosts</name><value>*</value></property>
>
> <property><name>hadoop.proxyuser.root.groups</name><value>*</value></property>
> </configuration>
>
> --
> Best regards,
--
Harsh J
Re: org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeExceptio
Posted by Harsh J <ha...@cloudera.com>.
Your hdfs-site.xml on the NN defines an "includes" file, but the
includes file does not list this connecting DN's proper hostname/IP,
causing the NN to reject it when it tries to ask itself to be
registered upon startup.
On Thu, Jan 9, 2014 at 4:05 PM, Pedro Sa da Costa <ps...@gmail.com> wrote:
>
> When I try to launch the namenode and the datanode in MRv2, the datanode
> can't connect to the namenode, giving me the error below. I also put the
> core-site file that I use below.
>
> The Firewall in the hosts is disabled. I don't have excluded nodes defined.
> Why the datanodes can't connect to the namenode? Any help to solve this
> problem?
>
>
> org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException):
> Datanode denied communication with namenode: DatanodeRegistrati
> on(0.0.0.0, storageID=DS-1449645935-172.16.1.10-50010-1389224474955,
> infoPort=50075, ipcPort=50020,
> storageInfo=lv=-40;cid=CID-9a8571a3-17ae-49b2-b957-b009e88b9f9a;nsid=9
> 34416283;c=0)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager.registerDatanode(DatanodeManager.java:631)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.registerDatanode(FSNamesystem.java:3398)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.registerDatanode(NameNodeRpcServer.java:881)
> at
> org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolServerSideTranslatorPB.registerDatanode(DatanodeProtocolServerSideTranslatorPB.java:90)
> at
> org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos$DatanodeProtocolService$2.callBlockingMethod(DatanodeProtocolProtos.java:18295)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:454)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1014)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1741)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1737)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:416)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1478)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1735)
>
> at org.apache.hadoop.ipc.Client.call(Client.java:1235)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:202)
> at com.sun.proxy.$Proxy9.registerDatanode(Unknown Source)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:622)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:164)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:83)
> at com.sun.proxy.$Proxy9.registerDatanode(Unknown Source)
> at
> org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB.registerDatanode(DatanodeProtocolClientSideTranslatorPB.java:146)
> at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.register(BPServiceActor.java:623)
> at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:225)
> at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:664)
> at java.lang.Thread.run(Thread.java:701)
>
> I set the core-site.xml
>
> <configuration>
> <property> <name>fs.default.name</name>
> <value>hdfs://10.103.0.17:9000</value> </property>
> <property> <name>hadoop.tmp.dir</name> <value>/tmp/hadoop-temp</value>
> </property>
>
> <property><name>hadoop.proxyuser.root.hosts</name><value>*</value></property>
>
> <property><name>hadoop.proxyuser.root.groups</name><value>*</value></property>
> </configuration>
>
> --
> Best regards,
--
Harsh J
Re: org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeExceptio
Posted by Harsh J <ha...@cloudera.com>.
Your hdfs-site.xml on the NN defines an "includes" file, but the
includes file does not list this connecting DN's proper hostname/IP,
causing the NN to reject it when it tries to ask itself to be
registered upon startup.
On Thu, Jan 9, 2014 at 4:05 PM, Pedro Sa da Costa <ps...@gmail.com> wrote:
>
> When I try to launch the namenode and the datanode in MRv2, the datanode
> can't connect to the namenode, giving me the error below. I also put the
> core-site file that I use below.
>
> The Firewall in the hosts is disabled. I don't have excluded nodes defined.
> Why the datanodes can't connect to the namenode? Any help to solve this
> problem?
>
>
> org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException):
> Datanode denied communication with namenode: DatanodeRegistrati
> on(0.0.0.0, storageID=DS-1449645935-172.16.1.10-50010-1389224474955,
> infoPort=50075, ipcPort=50020,
> storageInfo=lv=-40;cid=CID-9a8571a3-17ae-49b2-b957-b009e88b9f9a;nsid=9
> 34416283;c=0)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager.registerDatanode(DatanodeManager.java:631)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.registerDatanode(FSNamesystem.java:3398)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.registerDatanode(NameNodeRpcServer.java:881)
> at
> org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolServerSideTranslatorPB.registerDatanode(DatanodeProtocolServerSideTranslatorPB.java:90)
> at
> org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos$DatanodeProtocolService$2.callBlockingMethod(DatanodeProtocolProtos.java:18295)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:454)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1014)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1741)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1737)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:416)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1478)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1735)
>
> at org.apache.hadoop.ipc.Client.call(Client.java:1235)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:202)
> at com.sun.proxy.$Proxy9.registerDatanode(Unknown Source)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:622)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:164)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:83)
> at com.sun.proxy.$Proxy9.registerDatanode(Unknown Source)
> at
> org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB.registerDatanode(DatanodeProtocolClientSideTranslatorPB.java:146)
> at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.register(BPServiceActor.java:623)
> at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:225)
> at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:664)
> at java.lang.Thread.run(Thread.java:701)
>
> I set the core-site.xml
>
> <configuration>
> <property> <name>fs.default.name</name>
> <value>hdfs://10.103.0.17:9000</value> </property>
> <property> <name>hadoop.tmp.dir</name> <value>/tmp/hadoop-temp</value>
> </property>
>
> <property><name>hadoop.proxyuser.root.hosts</name><value>*</value></property>
>
> <property><name>hadoop.proxyuser.root.groups</name><value>*</value></property>
> </configuration>
>
> --
> Best regards,
--
Harsh J