[jira] [Comment Edited] (HDFS-12957) Multi master name node

["Andrew Schiefelbein (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-12957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16300592#comment-16300592 ] 

Andrew Schiefelbein edited comment on HDFS-12957 at 12/21/17 10:01 PM:
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Thank you for the comments.  I do understand that the ask is not a trivial one and I'm doing my best to try to optimize the current setup I have for throughput.   

The choices for my particular use case is to buy an expensive san / nas, use a glusterfs style setup or to hope that I can get enough throughput on the name node.  The scale of reads I need to do I'm not sure I can accomplish the speed I need in a system that has to go through a single node, what I'm trying to do may be an edge case and not fit within the HDFS model.

While I can get the HA setup with active / passive to work and I can have it behind a load balancer with a health check, because the fail over should be transparent to the down stream processes, I would much prefer not to have an active / active setup instead.  Even if it's 2 name nodes, both of them active at the same time to me is a better solution than having one in a passive role.  If we're going to spend the time and expense to setup servers to do a role they should take load or it's a waste of electricity to sit in a passive mode for the "what if" days that may never come.  It's an opinion and I know what that means, but if it could be done I think it would be a wonderful addition to the tool set.  


was (Author: aschiefe):
Thank you for the comments.  I do understand that the ask is not a trivial one and I'm doing my best to try to optimize the current setup I have for throughput.   

The choices for my particular use case is to buy an expensive san / nas, use a glusterfs style setup or to hope that I can get enough throughput on the name node.  The scale of reads I need to do I'm not sure I can accomplish the speed I need in a system that has to go through a single node, what I'm trying to do may be an edge case and not fit within the HDFS model.

While I can get the HA setup with active / passive to work and I can have it behind a load balancer with a health check because the fail over should be transparent to the down stream processes I would much prefer not to have an active / active setup instead.  Even if it's 2 name nodes, both of them active at the same time to me is a better solution than having one in a passive role.  If we're going to spend the time and expense to setup servers to do a role they should take load or it's a waste of electricity to sit in a passive mode for the "what if" days that may never come.  It's an opinion and I know what that means, but if it could be done I think it would be a wonderful addition to the tool set.  

> Multi master name node
> ----------------------
>
>                 Key: HDFS-12957
>                 URL: https://issues.apache.org/jira/browse/HDFS-12957
>             Project: Hadoop HDFS
>          Issue Type: Wish
>          Components: namenode
>    Affects Versions: 3.0.0
>         Environment: Multi node high availability with high throughput
>            Reporter: Andrew Schiefelbein
>            Priority: Minor
>
> While I do appreciate that the HA and federated setups do take care of some of the issues running in a multi node distributed fault tolerant way I believe that a singe name node is a bit of a pain point for me.
> My wish, and your mileage may vary, is that here could be a name node on each data node system so that each system could act as a gateway and worker for the cluster.
> In my tests right now I can push nearly 2 million records / second through a single node instance, but when I bring up 4 more nodes it doesn't go 4x faster as it has to retrieve from the name node and go through it as a gateway to the cluster.  For speed and resiliency if this could be spread out among n number of nodes and put behind a load balancer it would be the ideal solution for distributed resilient and high throughput shared storage. 



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