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https://issues.apache.org/jira/browse/SOLR-5172?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Woodward updated SOLR-5172:
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Attachment: SOLR-5172.patch
New patch.
* EmbeddedZkServer now has two implementations, Standalone and Ensemble.
* Ensemble deals with myid files before calling into ZK, so we don't need to
duplicated code from the ZK source.
* Embedded server startup is moved from ZkController (ie after the
CoreContainer is started) to SolrDispatchFilter.
* bootstrap_confdir logic moved to SolrDispatchFilter
* bootstrap_conf logic moved to ZkController.
In order to allow an embedded ensemble to be started up and bootstrapped,
ZkController now waits for a specific node (/upload-complete) to be created in
ZK before it starts up. This means you can do the following:
* start two solr instances (server1 and server2) with
--zkRun=server1,server2,server3. They will start up their embedded ZK servers
and then block waiting for a quorum
* start a third instance on server3 with zkRun and bootstrap_confdir. This
will join the quorum
* the two initial instances will now block waiting for the upload-complete node
* server3 loads its config, and creates the upload-complete node
* all three servers can now load their corecontainers.
This is a backwards-breaking change, ie after this patch, Solr won't start with
an old ZK instance because the upload-complete node won't be there. I'd like
to add an -upgrade task to ZkCli to deal with that, which can be run as a
one-off process when upgrading.
> Start embedded zk servers before CoreContainer loads
> ----------------------------------------------------
>
> Key: SOLR-5172
> URL: https://issues.apache.org/jira/browse/SOLR-5172
> Project: Solr
> Issue Type: Improvement
> Reporter: Alan Woodward
> Priority: Minor
> Attachments: SOLR-5172.patch, SOLR-5172.patch
>
>
> In SOLR-4718 we allowed solr.xml to be read from Zookeeper in cloud setups.
> However, this doesn't work with an embedded ZK server because it doesn't
> start until CoreContainer.load() is called, by which time solr.xml has
> already been loaded. We should move the embedded ZK startup/shutdown logic
> out of CoreContainer and into SolrDispatchFilter.
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