I'm not familiar with ec2, when you say "listen on private hostname"
what does that mean? Do you mean "by default listen on an interface with
a non-routable (localonly) ip"? Or something else. Is there an aws page
you can point me to?
Patrick
Jean-Daniel Cryans wrote:
When you saw:
org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot delete
/ebs1/mapred/system,/ebs2/mapred/system. Name node is in safe mode.
The ratio of reported blocks 0.0000 has not reached the threshold 0.9990. *Safe
mode will be turned off automatically*.
It means that HDFS is blocking everything (aka safe mode) until all
datanodes reported for duty (and then it waits for 30 seconds to make
sure).
When you saw:
Caused by: org.apache.zookeeper.KeeperException$NoNodeException:
KeeperErrorCode = *NoNode for /hbase/master*
It means that the Master node didn't write his znode in Zookeeper
because... when you saw:
2009-12-04 07:07:37,149 WARN org.apache.zookeeper.ClientCnxn: Exception
closing session 0x0 to sun.nio.ch.selectionkeyi...@10e35d5
java.net.ConnectException: Connection refused
It really means that the connection was refused. It then says it
attempted to connect to ec2-174-129-127-141.compute-1.amazonaws.com
but wasn't able to. AFAIK in EC2 the java processes tend to listen on
their private hostname not the public one (which would be bad
anyways).
Bottom line, make sure stuff listens where they are expected and it
should then work well.
J-D
On Fri, Dec 4, 2009 at 11:23 AM, Something Something
<[email protected]> wrote:
Hadoop: 0.20.1
HBase: 0.20.2
Zookeeper: The one which gets started by default by HBase.
HBase logs:
1) Master log shows this WARN message, but then it says 'connection
successful'
2009-12-04 07:07:37,149 WARN org.apache.zookeeper.ClientCnxn: Exception
closing session 0x0 to sun.nio.ch.selectionkeyi...@10e35d5
java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at
sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:574)
at
org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:933)
2009-12-04 07:07:37,150 WARN org.apache.zookeeper.ClientCnxn: Ignoring
exception during shutdown input
java.nio.channels.ClosedChannelException
at
sun.nio.ch.SocketChannelImpl.shutdownInput(SocketChannelImpl.java:638)
at sun.nio.ch.SocketAdaptor.shutdownInput(SocketAdaptor.java:360)
at
org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:999)
at
org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:970)
2009-12-04 07:07:37,150 WARN org.apache.zookeeper.ClientCnxn: Ignoring
exception during shutdown output
java.nio.channels.ClosedChannelException
at
sun.nio.ch.SocketChannelImpl.shutdownOutput(SocketChannelImpl.java:649)
at sun.nio.ch.SocketAdaptor.shutdownOutput(SocketAdaptor.java:368)
at
org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1004)
at
org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:970)
2009-12-04 07:07:37,199 INFO org.apache.hadoop.hbase.master.RegionManager:
-ROOT- region unset (but not set to be reassigned)
2009-12-04 07:07:37,200 INFO org.apache.hadoop.hbase.master.RegionManager:
ROOT inserted into regionsInTransition
2009-12-04 07:07:37,667 INFO org.apache.zookeeper.ClientCnxn: Attempting
connection to server
ec2-174-129-127-141.compute-1.amazonaws.com/10.252.146.65:2181
2009-12-04 07:07:37,668 INFO org.apache.zookeeper.ClientCnxn: Priming
connection to java.nio.channels.SocketChannel[connected local=/
10.252.162.19:46195 remote=
ec2-174-129-127-141.compute-1.amazonaws.com/10.252.146.65:2181]
2009-12-04 07:07:37,670 INFO org.apache.zookeeper.ClientCnxn: Server
connection successful
2) Regionserver log shows this... but later seems to have recovered:
2009-12-04 07:07:36,576 WARN org.apache.zookeeper.ClientCnxn: Exception
closing session 0x0 to sun.nio.ch.selectionkeyi...@4ee70b
java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at
sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:574)
at
org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:933)
2009-12-04 07:07:36,611 WARN org.apache.zookeeper.ClientCnxn: Ignoring
exception during shutdown input
java.nio.channels.ClosedChannelException
at
sun.nio.ch.SocketChannelImpl.shutdownInput(SocketChannelImpl.java:638)
at sun.nio.ch.SocketAdaptor.shutdownInput(SocketAdaptor.java:360)
at
org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:999)
at
org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:970)
2009-12-04 07:07:36,611 WARN org.apache.zookeeper.ClientCnxn: Ignoring
exception during shutdown output
java.nio.channels.ClosedChannelException
at
sun.nio.ch.SocketChannelImpl.shutdownOutput(SocketChannelImpl.java:649)
at sun.nio.ch.SocketAdaptor.shutdownOutput(SocketAdaptor.java:368)
at
org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1004)
at
org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:970)
2009-12-04 07:07:36,742 WARN
org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper: Failed to set watcher on
ZNode /hbase/master
org.apache.zookeeper.KeeperException$ConnectionLossException:
KeeperErrorCode = ConnectionLoss for /hbase/master
at
org.apache.zookeeper.KeeperException.create(KeeperException.java:90)
at
org.apache.zookeeper.KeeperException.create(KeeperException.java:42)
at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:780)
at
org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.watchMasterAddress(ZooKeeperWrapper.java:304)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.watchMasterAddress(HRegionServer.java:385)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.reinitializeZooKeeper(HRegionServer.java:315)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.reinitialize(HRegionServer.java:306)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.<init>(HRegionServer.java:276)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.doMain(HRegionServer.java:2474)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.main(HRegionServer.java:2542)
2009-12-04 07:07:36,743 WARN
org.apache.hadoop.hbase.regionserver.HRegionServer: Unable to set watcher on
ZooKeeper master address. Retrying.
3) Zookeepr log: Nothing much in there... just a starting message line..
followed by
ulimit -n 1024
I looked at archives. There was one mail that talked about 'ulimit'.
Wonder if that has something to do with it.
Thanks for your help.
On Fri, Dec 4, 2009 at 8:18 AM, Mark Vigeant
<[email protected]>wrote:
When I first started my hbase cluster, it too gave me the nonode for
/hbase/master several times before it started working, and I believe this is
a common beginner's error (I've seen it in a few emails in the past 2
weeks).
What versions of HBase, Hadoop and ZooKeeper are you using?
Also, take a look in your HBASE_HOME/logs folder. That would be a good
place to start looking for some answers.
-Mark
-----Original Message-----
From: Something Something [mailto:[email protected]]
Sent: Friday, December 04, 2009 2:28 AM
To: [email protected]
Subject: Starting HBase in fully distributed mode...
Hello,
I am trying to get Hadoop/HBase up and running in a fully distributed mode.
For now, I have only *1 Master & 2 Slaves*.
The Hadoop starts correctly.. I think. The only exception I see in various
log files is this one...
org.apache.hadoop.ipc.RemoteException:
org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot delete
/ebs1/mapred/system,/ebs2/mapred/system. Name node is in safe mode.
The ratio of reported blocks 0.0000 has not reached the threshold 0.9990.
*Safe
mode will be turned off automatically*.
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.deleteInternal(FSNamesystem.java:1696)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.delete(FSNamesystem.java:1676)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.delete(NameNode.java:517)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Somehow this doesn't sound critical, so I assumed everything was good to go
with Hadoop.
So then I started HBase and opened a shell (hbase shell). So far
everything
looks good. Now when I try to run a 'list' command, I keep getting this
message:
Caused by: org.apache.zookeeper.KeeperException$NoNodeException:
KeeperErrorCode = *NoNode for /hbase/master*
at org.apache.zookeeper.KeeperException.create(KeeperException.java:102)
at org.apache.zookeeper.KeeperException.create(KeeperException.java:42)
at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:892)
at
org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.readAddressOrThrow(ZooKeeperWrapper.java:328)
Here's what I have in my *Master hbase-site.xml*
<configuration>
<property>
<name>hbase.rootdir</name>
<value>hdfs://master:54310/hbase</value>
</property>
<property>
<name>hbase.cluster.distributed</name>
<value>true</value>
</property>
<property>
<name>hbase.zookeeper.property.clientPort</name>
<value>2181</value>
</property>
<property>
<name>hbase.zookeeper.quorum</name>
<value>master,slave1,slave2</value>
</property>
<property>
The *Slave *hbase-site.xml are set as follows:
<property>
<name>hbase.rootdir</name>
<value>hdfs://master:54310/hbase</value>
</property>
<property>
<name>hbase.cluster.distributed</name>
<value>false</value>
</property>
<property>
<name>hbase.zookeeper.property.clientPort</name>
<value>2181</value>
</property>
In the hbase-env.sh file on ALL 3 machines I have set the JAVA_HOME and set
the HBase classpath as follows:
export HBASE_CLASSPATH=$HBASE_CLASSPATH:/ebs1/hadoop-0.20.1/conf
On *Master* I have added Master & Slaves IP hostnames to *regionservers*
file.
On *slaves*, the regionservers file is empty.
I have run hadoop namenode -format multiple times, but still keep getting..
"NoNode for /hbase/master". What step did I miss? Thanks for your help.
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