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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-1277) Implement a Solr specific naming service (using Zookeeper)
Date Sat, 12 Dec 2009 22:29:18 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1277?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12789808#action_12789808
] 

Yonik Seeley commented on SOLR-1277:
------------------------------------

OK, I fixed it for now (rather hacked around it).
The zookeeper client startup is asynchronous - if you use it fast enough after creation, you
can get a ConnectionLoss (really it never finished establishing it I believe).  For now I've
just added a sleep of 200ms (100 often wasn't enough).  I suppose we should switch to using
a Watcher and some sort of wait mechanism when we really need to do a zookeeper operation
synchronously.

It does bring up the point that we need to think about what we can do when disconnected from
zk to... some things we will need to wait for zk, some things we can remember and update zk
when we become connected again, and some things we could simply drop.

> 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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