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https://issues.apache.org/jira/browse/SOLR-1277?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12791442#action_12791442
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Mark Miller commented on SOLR-1277:
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Yeah, I'm not trying to tackle node selection yet - just client timeouts. But
if a client is going to be periodically updating a node to state its still in
good shape, it seems like it might as well make the update include its current
load. Not that thats not something that can be easily added later - I mostly
through that in because it was part of the previous recommendation on how to
handle client timeouts.
I don't necessarily like the idea of all of the nodes updating all the time to
note their existence, but it seems like our best option from what I gather now.
Otherwise, nodes will be timing out all the time - and handling the
reconnection seems like a pain - if Solr needs something from ZooKeeper after a
GC ends, its going to have to pause and wait for the reconnect. Or I guess, on
every ZooKeeper request, build in a timed retry?
My main concern at the moment is coming up with a plan for these timeouts
though. If we raise the timeout limits, we need another method for determining
nodes are down.
I suppose another option might be, its up to a node that can't reach another
node to tag it as unresponsive?
> 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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