[
https://issues.apache.org/jira/browse/ACCUMULO-1832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13885810#comment-13885810
]
Keith Turner commented on ACCUMULO-1832:
----------------------------------------
Looking at the utility that was created, I think it makes the following
assumptions :
* All volumes in use are no longer accessible
* No tablets are currently loaded
I think if any of these assumptions are not true, then the utility will not
work so well. An example situation is new a DNS addr for the namenode is
planned. For a short period of time the new and old namenode DNS addrs work.
An admin wants to use this utility to replace the old DNS addrress. The
current utility would make changes to loaded tablets metadata, which would make
Accumulo very unhappy. I am thinking removing the script and doing the
following to solve this problem.
* Support storing a list of URI rename in zookeeper or in accumulo-site.xml
(maybe make it a tserver or general config so it could be in either)
* When each tablet loads it checks its paths against this list of renames and
if changes are needed it does them.
Also I think admins will need a utility to list all unique URI prefixes in use
by Accumulo. This utility should start w/ zookeeper, then root table, then
metadata table listing unique URIs used by each one. This utility would allow
admins to find URI that need to replaced that they were not aware of. Also it
will allow them to know when the rename is done and the config can be removed.
I am going to experiment w/ this approach.
> 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.
--
This message was sent by Atlassian JIRA
(v6.1.5#6160)
