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