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Date: Fri, 19 Feb 2010 21:26:27 +0000 (UTC)
From: "Jason Rutherglen (JIRA)" <jira@apache.org>
To: solr-dev@lucene.apache.org
Subject: [jira] Commented: (SOLR-1724) Real Basic Core Management with
 Zookeeper
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    [ https://issues.apache.org/jira/browse/SOLR-1724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12835955#action_12835955 ] 

Jason Rutherglen commented on SOLR-1724:
----------------------------------------

Also needed is the ability to move an existing core to a
different Solr server. The core will need to be copied via
direct HTTP file access, from a Solr server to another Solr
server. There is no need to zip the core first. 

This feature is useful for core indexes that have been
incrementally built, then need to be archived (i.e. the index was not
constructed using Hadoop).

> 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
>
>         Attachments: commons-lang-2.4.jar, gson-1.4.jar, hadoop-0.20.2-dev-core.jar, hadoop-0.20.2-dev-test.jar, SOLR-1724.patch, SOLR-1724.patch, SOLR-1724.patch, SOLR-1724.patch, SOLR-1724.patch, SOLR-1724.patch, SOLR-1724.patch
>
>
> 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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