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From "Keith Turner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-1832) Create utility for rewriting uris
Date Wed, 22 Jan 2014 20:37:20 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-1832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13879154#comment-13879154
] 

Keith Turner commented on ACCUMULO-1832:
----------------------------------------

I was thinking about how user might use the new HA namenode w/ 1.6. and another use case for
this utility occurred to me.  The following scenario seems like a possibility. 

 # User sets up single namnode w/ address http://<dns address>:<port>
 # User runs Accumulo 1.6.0 using this namenode.
 # User replaces single namenode w/ HA namenode w/ address http://<nameservice id>
 # User replaces all instances of  http://<dns address>:<port> in Accumulo metadata
with  http://<nameservice id>

It would be nice if all users just started off w/ HA namenodes, but I suspect the above may
not be uncommon. If the user does not do step 4 and things just happen to still work, then
they may not find out they need to do it until a namenode failure occurs. 

> Create utility for rewriting uris
> ---------------------------------
>
>                 Key: ACCUMULO-1832
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1832
>             Project: Accumulo
>          Issue Type: Sub-task
>          Components: master, tserver
>            Reporter: Keith Turner
>            Assignee: Eric Newton
>            Priority: Blocker
>             Fix For: 1.6.0
>
>
> When a users namenode dies and they restore it on another node Accumulo will not work
since it stores fully qualified uris internally.  Need to a provide a utility to rewrite these
URIs.
> The utility  could rewrite paths in zookeeper, bring root table online and rewrite paths,
bring metadata table online and rewrite, and then allow user tablets to come online.



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