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https://issues.apache.org/jira/browse/SOLR-1724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12801216#action_12801216
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Jason Rutherglen commented on SOLR-1724:
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Ted,
Thanks for the Katta link.
This patch will likely de-emphasize the distributed search part,
which is where the ephemeral node is used (i.e. a given server
lists it's current state). I basically want to take care of this
one little deployment aspect of cores, improving on the wacky
hackedy system I'm running today. Then IF it works, then I'll
look at the distributed search part, hopefully in a totally
separate patch.
> Real Basic Core Management with Zookeeper
> -----------------------------------------
>
> Key: SOLR-1724
> URL: https://issues.apache.org/jira/browse/SOLR-1724
> Project: Solr
> Issue Type: New Feature
> Components: multicore
> Affects Versions: 1.4
> Reporter: Jason Rutherglen
> Fix For: 1.5
>
>
> Though we're implementing cloud, I need something real soon I can
> play with and deploy. So this'll be a patch that only deploys
> new cores, and that's about it. The arch is real simple:
> On Zookeeper there'll be a directory that contains files that
> represent the state of the cores of a given set of servers which
> will look like the following:
> /production/cores-1.txt
> /production/cores-2.txt
> /production/core-host-1-actual.txt (ephemeral node per host)
> Where each core-N.txt file contains:
> hostname,corename,instanceDir,coredownloadpath
> coredownloadpath is a URL such as file://, http://, hftp://, hdfs://, ftp://,
> etc
> and
> core-host-actual.txt contains:
> hostname,corename,instanceDir,size
> Everytime a new core-N.txt file is added, the listening host
> finds it's entry in the list and begins the process of trying to
> match the entries. Upon completion, it updates it's
> /core-host-1-actual.txt file to it's completed state or logs an error.
> When all host actual files are written (without errors), then a
> new core-1-actual.txt file is written which can be picked up by
> another process that can create a new core proxy.
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