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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-118) accumulo could work across HDFS instances, which would help it to scale past a single namenode
Date Fri, 04 Nov 2011 16:45:51 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13144144#comment-13144144
] 

Todd Lipcon commented on ACCUMULO-118:
--------------------------------------

In HDFS 0.23 we have federation, which is (a) server side support so that a pool of DNs can
have blocks that span multiple NNs/namespaces, and (b) client side mount table support "viewfs".
So, you could have 10,000 DNs, a few NNs, and a client side mount table that divides up the
namespace across those NNs.
                
> accumulo could work across HDFS instances, which would help it to scale past a single
namenode
> ----------------------------------------------------------------------------------------------
>
>                 Key: ACCUMULO-118
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-118
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: master, tserver
>    Affects Versions: 1.5.0
>            Reporter: Eric Newton
>            Assignee: Eric Newton
>   Original Estimate: 2,016h
>  Remaining Estimate: 2,016h
>
> Consider using full path names to files, which would allow the servers to access the
files on any HDFS file system.
> Work may exist elsewhere to run HDFS using a number of NameNode instances to break up
the namespace.
> We may need a pluggable strategy to determine namespace for new files.

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