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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 Wed, 02 Dec 2009 14:06:20 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1277?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12784828#action_12784828
] 

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

bq.  in particular the issue they have faced is that the JVM GC can pause the ZK client vm
(hbase region server) for >> 1 minute (in some cases we saw 4 minutes). If this is an
issue for you (does solr ever see pauses like this?) we may need to discuss.

I've seen multi-minute pauses myself in the past (on an indexing master during an optimize).
 Lucene and the JVMs have improved since then, but we probably can't rule it out.  Any pointers
on ways to deal with this?

> 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, 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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