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https://issues.apache.org/jira/browse/ACCUMULO-118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13890330#comment-13890330
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Josh Elser commented on ACCUMULO-118:
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I think the short of it here: it's hard.
I remember when Eric was initially working on absolute paths and I thought
"hrm, that's a good idea. should simplify a lot of things in the end". In
hindsight, I don't think I really considered all of the difficulties that the
changes introduce (most notably around upgrades and namenode/namespace
decommissioning).
Maintaining a long-running feature branch isn't too bad as long as the code you
tweaked also doesn't change out from underneath you.
I agree with you Keith, I think that focusing on design docs before starting to
work on it can help quite a bit on a couple of levels (avoid flaws in design,
catch bugs earlier, net a better architected solutions). Additionally, firming
up a design can also help us break down "really big" problems into "slightly
less big" problems which will likely help manage those changes. I think we've
generally tried to abstain from requiring voting, but if that's what we need to
get eyes on ideas, so be it. If we can get good, thought-out reviews without
voting (which I think we've been fairly decent at so far, but we haven't had
"big" designs go through review yet), I'd rather stay that way.
> 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
> Reporter: Eric Newton
> Assignee: Eric Newton
> Priority: Blocker
> Fix For: 1.6.0
>
> Attachments: ACCUMULO-118-01.txt, ACCUMULO-118-02.txt
>
> 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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