I have a test cluster of two machines, on both of them hadoop is installed. I've configured the hadoop cluster but on admin UI (as in the below picture) I see that two nodes are running on the same master machine, and that the other machine has no Hadoop node.
On master machine following services are running:
~$ jps
26310 ResourceManager
27593 Jps
26216 DataNode
26135 NameNode
26557 NodeManager
26701 JobHistoryServer
On the slave machine:
~$ jps
2614 DataNode
2920 Jps
2707 NodeManager
I don't why the slave is not joining the cluster (It was before). I tried to shutdown all servers on both machines and format HDFS then restarting everything but that didn't help. Any help to figure what's causing that behavior is appreciated.
Fixed, the two machines had same hostname! So I just renamed the slave.
Related
I am running the following script to run all the hbase and hadoop processes in my hbase setup in virtual machine.
#!/bin/sh
start-dfs.sh
start-yarn.sh
start-hbase.sh
#hbase-daemon.sh start rest
hbase-daemon.sh start thriftr
Earlier all the processes used to run properly. But recently, I have force shutdown my virtual machine process without stopping the hbase and hadoop related processes. Then my datanode process stopped. Later I have formatted my name node process, using some suggestion on online. Now my name node comes properly but data node process does not come up. When I check the running java process (JPS) the datanode process is missing
4672 NodeManager
5474 ThriftServer
4098 NameNode
4408 SecondaryNameNode
5723 Jps
4555 ResourceManager
5372 HRegionServer
5246 HMaster
5182 HQuorumPeer
But earlier the DataNode process used to come properly. Is it because of formatting my namenode. Do I need to change any config data or someting also?
I am trying to set of a multi-node hadoop cluster using Hadoop 3.0.0. There is no straightforward documentation on this so I had to read a lot of blogs. I am at a point where when I run start-all.sh I see daemon processes appearing in the name node as well as data nodes. However, when I go to http://namenode:9870 I see 0 live nodes.
To be more specific when I run start-all.sh I see
and I when I run jps I see NameNode, SecondaryNameNode and ResourceManager processes are running. On data nodes running jps shows DataNode and NodeManager are running.
What I get on the url is
Any guidance is greatly appreciated.
Thanks
I have a two node Haoop 2.7.1 installation on Ubuntu 12.04 LTS. All the demons are up and running after sbin/start-dfs.sh && sbin/start-yarn.sh as confirmed by jps.
However, only the Master node(it doubles as slave) is doing work while the slave-node's DataNode sits idle.
The weird thing is that the tmp folder of the slave-node is being populated by nm-local-dir (created by the ResourceManager I presume).
All configuration seems fine and I have tried every trick that the Internet can suggest- but to no avail.
Any ideas?
Delete the local datanode/namenode folder on the master node and all the slave nodes then do hdfs namenode -format
I think that the problem is an inconsistency in the clusterID between the master and the slaves.
am trying to install a multiple pseudo nodes for an experimental cluster. The reason is simple: I just have only one machine in my office.
Therefore, i followed this guide: and especially the answer of Matt:
http://search-hadoop.com/m/sApJY1zWgQV/
I created an additional folder conf2
1.1. In hadoop-env.sh, i edited HADOOP_IDENT_STRING to ${USER}_02
1.2. I changed the data.dir in hdfs-site.xml
1.3. In hdfs-site.xml i changed the port of:
dfs.datanode.address (default 0.0.0.0:50010)
dfs.datanode.ipc.address (default 0.0.0.0:50020)
dfs.datanode.http.address (default 0.0.0.0:50075)
dfs.datanode.https.address (default 0.0.0.0:50475)
I tried the command: "./hadoop-daemons.sh --config ../conf2 start datanode"
on my current single node hadoop system
The error is still: "localhost: datanode running as process 42855. Stop it first."
The jps command says:
:~/hadoop/bin$ jps
2255 Jps
43412 SecondaryNameNode
43853 TaskTracker
42855 DataNode
43544 JobTracker
42537 NameNode
Does anyone have an idea how i could trick my hadoop system to accept the additional data node now?
thanks alot
I am trying to run Multi Node Cluster of Hadoop over a LAN Network.
I am running my master as namenode and datanode both
and another machine as datanode
When I started hadoop from master and did jps on master and slave I got
master > NameNode
DataNode
SecondaryNameNode
JobTracker
TaskTracker
Jps
and on slave
slave > DataNode
TaskTracker
Jps
but after a while I get :(
slave > Jps
so I checked my log of datanode on slave and I am getting this error
ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: org.apache.hadoop.ipc.RPC$VersionMismatch: Protocol org.apache.hadoop.hdfs.server.protocol.DatanodeProtocol version mismatch. (client = 25, server = 26)
Is it because of the different versions of hadoop on master and slave???
You need to install the same version across the whole cluster.
Yes, it is because of using different protocol on master and slave machine.
In this case, slave will not be able to communicate with master machine.