You should launch the master only once, on whatever machine you like. Then you will be able to access it from any other machine. Please have a look at the blog I mentioned in my previous mail.
On Thu, Sep 27, 2012 at 9:39 AM, Venkateswara Rao Dokku <[email protected] > wrote: > I can see that HMaster is not started on the data-node machine when the > start scripts in hadoop & hbase ran on the hadoop-namenode. My doubt is > that,Shall we have to start that master on the hadoop-datanode1 too or the > hadoop-datanode1 will access the Hmaster that is running on the > hadoop-namenode to create,list,scan tables as the two nodes are in the > cluster as namenode & datanode. > > On Thu, Sep 27, 2012 at 1:02 PM, n keywal <[email protected]> wrote: > > > Hi, > > > > I would like to direct you to the reference guide, but I must acknowledge > > that, well, it's a reference guide, hence not really easy for a plain new > > start. > > You should have a look at Lars' blog (and may be buy his book), and > > especially this entry: > > http://www.larsgeorge.com/2009/10/hbase-architecture-101-storage.html > > > > Some hints however: > > - the replication occurs at the hdfs level, not the hbase level: hbase > > writes files that are split in hdfs blocks that are replicated accross > the > > datanodes. If you want to check the replications, you must look at what > > files are written by hbase and how they have been split in blocks by hdfs > > and how these blocks have been replicated. That will be in the hdfs > > interface. As a side note, it's not the easiest thing to learn when you > > start :-) > > - The error > ERROR: org.apache.hadoop.hbase.MasterNotRunningException: > > Retried 7 times > > this is not linked to replication or whatever. It means that second > > machine cannot find the master. You need to fix this first. (googling & > > checking the logs). > > > > > > Good luck, > > > > Nicolas > > > > > > > > > > On Thu, Sep 27, 2012 at 9:07 AM, Venkateswara Rao Dokku < > > [email protected] > > > wrote: > > > > > How can we verify that the data(tables) is distributed across the > > cluster?? > > > Is there a way to confirm it that the data is distributed across all > the > > > nodes in the cluster.? > > > > > > On Thu, Sep 27, 2012 at 12:26 PM, Venkateswara Rao Dokku < > > > [email protected]> wrote: > > > > > > > Hi, > > > > I am completely new to Hbase. I want to cluster the Hbase on two > > > > nodes.I installed hadoop,hbase on the two nodes & my conf files are > as > > > > given below. > > > > *cat conf/regionservers * > > > > hbase-regionserver1 > > > > hbase-master > > > > *cat conf/masters * > > > > hadoop-namenode > > > > * cat conf/slaves * > > > > hadoop-datanode1 > > > > *vim conf/hdfs-site.xml * > > > > <?xml version="1.0"?> > > > > <?xml-stylesheet type="text/xsl" href="configuration.xsl"?> > > > > > > > > <!-- Put site-specific property overrides in this file. --> > > > > > > > > <configuration> > > > > <property> > > > > <name>dfs.replication</name> > > > > <value>2</value> > > > > <description>Default block replication.The actual number of > > > > replications can be specified when the file is created. The default > is > > > used > > > > if replication is not specified in create time. > > > > </description> > > > > </property> > > > > <property> > > > > <name>dfs.support.append</name> > > > > <value>true</value> > > > > <description>Default block replication.The actual number of > > > > replications can be specified when the file is created. The default > is > > > used > > > > if replication is not specified in create time. > > > > </description> > > > > </property> > > > > </configuration> > > > > *& finally my /etc/hosts file is * > > > > 127.0.0.1 localhost > > > > 127.0.0.1 oc-PowerEdge-R610 > > > > 10.2.32.48 hbase-master hadoop-namenode > > > > 10.240.13.35 hbase-regionserver1 hadoop-datanode1 > > > > The above files are identical on both of the machines. The following > > are > > > > the processes that are running on my m/c's when I ran start scripts > in > > > > hadoop as well as hbase > > > > *hadoop-namenode:* > > > > HQuorumPeer > > > > HMaster > > > > Main > > > > HRegionServer > > > > SecondaryNameNode > > > > Jps > > > > NameNode > > > > JobTracker > > > > *hadoop-datanode1:* > > > > > > > > TaskTracker > > > > Jps > > > > DataNode > > > > -- process information unavailable > > > > Main > > > > NC > > > > HRegionServer > > > > > > > > I can able to create,list & scan tables on the *hadoop-namenode* > > machine > > > > using Hbase shell. But while trying to run the same on the * > > > > hadoop-datanode1 *machine I couldn't able to do it as I am getting > > > > following error. > > > > hbase(main):001:0> list > > > > TABLE > > > > > > > > > > > > ERROR: org.apache.hadoop.hbase.MasterNotRunningException: Retried 7 > > times > > > > > > > > Here is some help for this command: > > > > List all tables in hbase. Optional regular expression parameter could > > > > be used to filter the output. Examples: > > > > > > > > hbase> list > > > > hbase> list 'abc.*' > > > > How can I list,scan the tables that are created by the > > *hadoop-namenode * > > > > from the *hadoop-datanode1* machine. Similarly Can I create some > tables > > > > on *hadoop-datanode1 *& can I access them from the *hadoop-namenode > * > > & > > > > vice-versa as the data is distributed as this is a cluster. > > > > > > > > > > > > > > > > -- > > > > Thanks & Regards, > > > > Venkateswara Rao Dokku, > > > > Software Engineer,One Convergence Devices Pvt Ltd., > > > > Jubille Hills,Hyderabad. > > > > > > > > > > > > > > > > > -- > > > Thanks & Regards, > > > Venkateswara Rao Dokku, > > > Software Engineer,One Convergence Devices Pvt Ltd., > > > Jubille Hills,Hyderabad. > > > > > > > > > -- > Thanks & Regards, > Venkateswara Rao Dokku, > Software Engineer,One Convergence Devices Pvt Ltd., > Jubille Hills,Hyderabad. >
