Rao, Can you make sure your region server is actually running? You can use jps command to see Java processes, or a "ps ax |grep region".
Thanks, Stas On Thu, Sep 27, 2012 at 12:25 PM, Venkateswara Rao Dokku < dvrao....@gmail.com> wrote: > When I try to scan the table that is created by hadoop-namenode in the > hadoop-datanode, I am getting the following error > 12/09/27 16:47:55 INFO ipc.HBaseRPC: Problem connecting to server: > localhost/127.0.0.1:60020 > > Could you please help me out in overcoming this problem. > Thanks for replying. > > On Thu, Sep 27, 2012 at 4:02 PM, Venkateswara Rao Dokku < > dvrao....@gmail.com > > wrote: > > > I started the Hmaster on the hadoop-namenode. But I was not able to > access > > it from the hadoop-datanode. Could you please help me solving this > problem > > by sharing what are the possibilities for this to happen. > > > > > > On Thu, Sep 27, 2012 at 1:21 PM, n keywal <nkey...@gmail.com> wrote: > > > >> 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 < > >> dvrao....@gmail.com > >> > 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 <nkey...@gmail.com> 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 < > >> > > dvrao....@gmail.com > >> > > > 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 < > >> > > > dvrao....@gmail.com> 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. > >> > > >> > > > > > > > > -- > > 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. >
