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From "Andrew Schiefelbein (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12957) Multi master name node
Date Thu, 21 Dec 2017 17:27:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16300317#comment-16300317

Andrew Schiefelbein commented on HDFS-12957:

Someone just pointed this out to me:

The short circuit reads will work for my local processes, but for distributed ones having
the ability to have name nodes behind a load balancer would be a wonderful addition. 

> 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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