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From "Patrick Hunt (JIRA)" <>
Subject [jira] Commented: (SOLR-1277) Implement a Solr specific naming service (using Zookeeper)
Date Mon, 14 Dec 2009 19:09:21 GMT


Patrick Hunt commented on SOLR-1277:

Regarding connection to ZooKeeper, this example shows one way to wait for the connection to
be established using a re-usable "CountdownWatcher"

You might also want to review the faq for more insight into zk state transitions and their

FF to open a dialog on zookeeper-user if you have questions.

> Implement a Solr specific naming service (using Zookeeper)
> ----------------------------------------------------------
>                 Key: SOLR-1277
>                 URL:
>             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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