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. >> >> This email message and any attachments are for the sole use of the intended >> recipients and may contain proprietary and/or confidential information which >> may be privileged or otherwise protected from disclosure. Any unauthorized >> review, use, disclosure or distribution is prohibited. If you are not an >> intended recipient, please contact the sender by reply email and destroy the >> original message and any copies of the message as well as any attachments to >> the original message. >> >
