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What is Edge nodes?

Question asked by lc2a on May 23, 2013
Latest reply on May 23, 2013 by nabeel

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Mentioned at [http://www.mapr.com/doc/display/MapR2/Planning+the+Cluster#PlanningtheCluster-NodeTypes][1]

**Edge Nodes**

So-called Edge nodes provide a common user access point for the MapR webserver and other client tools. Edge nodes may or may not be part of the cluster, as long as the edge node can reach cluster nodes. Nodes on the same network can run client services, MySQL for Metrics, and so on.

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However, I'm still not clear.

a) Why need 'provide a common user access point for the MapR webserver' ?

b) If I want to read/write to MapR-FS. It is just NFS mount point it .. or it is necessary to go thru Edge Nodes?

Thanks in advance.

[1]: http://www.mapr.com/doc/display/MapR2/Planning+the+Cluster#PlanningtheCluster-NodeTypes

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lc2a May 23, 2013 2:06 AM
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Hi Nabeel

If not planning to use NFS, then
It is the Edge node will just install with **MapR Client** http://www.mapr.com/doc/display/MapR2/Setting+Up+the+Client#SettingUptheClient-client

It is need to have cluster of Edge nodes? for fail-over? What will be the configuration so that each Edge nodes awares & know it belong to the Edge cluster?
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- nabeel @ null on May 23, 2013 2:06 AM
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  You can install the mapr client on any node. It can be your user desktop also. It doesn't need to be on an edge node. Edge node doesn't have anything to do with failover. It's just a term to denote nodes in the cluster that don't run any of the core cluster services on it.
  
  Setting up a client is described in the link you posted.
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nabeel May 23, 2013 2:06 AM
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a) So that all the functionality that directly doesn't involve core cluster services like Fileserver/Tasktracker/Jobtracker/HBaseRegionserver/HBasemaster etc can be put into a single node and can be a single point of access. Otherwise you would have identify where the webserver is running, where the mysql for metrics is running , where other services are running etc.

On the actual cluster nodes, you can devote the full resources on the node for actual filesystem i/o, mapreduce processing and hbase etc. This isn't mandatory. It's just a suggestion for better architectural planning.

b) If you want to read write via NFS, then host a MapR NFS server either on a cluster node or on the edge node. Then point the nfs client to mount it. Having an mapr NFS role on any one node is mandatory for NFS mounting the filesystem. It's not a must to have it on the edge nodes only.
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praveenshettigar May 29, 2013 10:00 PM
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Hi Nabeel -
b) If you want to read write via NFS, then host a MapR NFS server either on a cluster node or on the edge node. Then point the nfs client to mount it. Having an mapr NFS role on any one node is mandatory
for NFS mounting the filesystem. It's not a must to have it on the edge nodes only.

From what you are saying the ability to read and write can be achieved by using an NFS client on the edge node where edge node is outside the cluster or make edge node part of the cluster and have MapR NFS Services run on it.

Is there a performance gain if I use MapR NFS service on the edge node versus an NFS client on the edge node. I am trying to understand if there is an advantage of one aproach over another.

Thank you!
Praveen
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clpong Jun 18, 2015 7:13 PM
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hi Nabeel,
if I would want to use a command to find out which host/server is edge node, what is the command that I can use?

Example, if i want to know where MCS is running, i can use:
maprcli node list -columns svc | grep webserver

and if to check service running, i can use jps.

But, I have no idea how to know which host/server is edge node for the cluster.
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