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From "Mark Miller (JIRA)" <>
Subject [jira] [Commented] (SOLR-3526) Remove classfile dependency on ZooKeeper from CoreContainer
Date Fri, 18 Dec 2015 20:01:46 GMT


Mark Miller commented on SOLR-3526:

I'm not sure we want to deal with those kinds of restrictions. Solr has many dependencies
and ZK is not a particularly large one. I don't see why it should get special attention or
special rules.

> Remove classfile dependency on ZooKeeper from CoreContainer
> -----------------------------------------------------------
>                 Key: SOLR-3526
>                 URL:
>             Project: Solr
>          Issue Type: Wish
>          Components: SolrCloud
>    Affects Versions: 4.0-ALPHA
>            Reporter: Michael Froh
> We are using Solr as a library embedded within an existing application, and are currently
developing toward using 4.0 when it is released.
> We are currently instantiating SolrCores with null CoreDescriptors (and hence no CoreContainer),
since we don't need SolrCloud functionality (and do not want to depend on ZooKeeper).
> A couple of months ago, SearchHandler was modified to try to retrieve a ShardHandlerFactory
from the CoreContainer. I was able to work around this by specifying a dummy ShardHandlerFactory
in the config.
> Now UpdateRequestProcessorChain is inserting a DistributedUpdateProcessor into my chains,
again triggering a NPE when trying to dereference the CoreDescriptor.
> I would happily place the SolrCores in CoreContainers, except that CoreContainer imports
and references org.apache.zookeeper.KeeperException, which we do not have (and do not want)
in our classpath. Therefore, I get a ClassNotFoundException when loading the CoreContainer
> Ideally (IMHO), ZkController should isolate the ZooKeeper dependency, and simply rethrow
KeeperExceptions as (or some Solr-hosted checked
exception). Then CoreContainer could remove the offending import/references.

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