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Date: Sat, 12 Dec 2009 23:09:18 +0000 (UTC)
From: "Henry Robinson (JIRA)" <jira@apache.org>
To: solr-dev@lucene.apache.org
Subject: [jira] Commented: (SOLR-1277) Implement a Solr specific naming
 service (using Zookeeper)
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    [ https://issues.apache.org/jira/browse/SOLR-1277?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12789814#action_12789814 ] 

Henry Robinson commented on SOLR-1277:
--------------------------------------

Yonik - 

You're right, the way to correctly connect is to have a condition variable that can get notified by a watcher fired when the connection to ZK is established. You will also of course need to worry about what happens if the connection is established before you can issue the wait on the condition variable, and you lose the wake-up :) We should maybe think about adding a synchronous connection API to ZooKeeper...

Henry


> Implement a Solr specific naming service (using Zookeeper)
> ----------------------------------------------------------
>
>                 Key: SOLR-1277
>                 URL: https://issues.apache.org/jira/browse/SOLR-1277
>             Project: Solr
>          Issue Type: New Feature
>    Affects Versions: 1.4
>            Reporter: Jason Rutherglen
>            Assignee: Grant Ingersoll
>            Priority: Minor
>             Fix For: 1.5
>
>         Attachments: log4j-1.2.15.jar, SOLR-1277.patch, SOLR-1277.patch, SOLR-1277.patch, SOLR-1277.patch, zookeeper-3.2.1.jar
>
>   Original Estimate: 672h
>  Remaining Estimate: 672h
>
> The goal is to give Solr server clusters self-healing attributes
> where if a server fails, indexing and searching don't stop and
> all of the partitions remain searchable. For configuration, the
> ability to centrally deploy a new configuration without servers
> going offline.
> We can start with basic failover and start from there?
> Features:
> * Automatic failover (i.e. when a server fails, clients stop
> trying to index to or search it)
> * Centralized configuration management (i.e. new solrconfig.xml
> or schema.xml propagates to a live Solr cluster)
> * Optionally allow shards of a partition to be moved to another
> server (i.e. if a server gets hot, move the hot segments out to
> cooler servers). Ideally we'd have a way to detect hot segments
> and move them seamlessly. With NRT this becomes somewhat more
> difficult but not impossible?

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