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https://issues.apache.org/jira/browse/SOLR-5580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13858868#comment-13858868
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Mark Miller commented on SOLR-5580:
-----------------------------------
You can currently accomplish two things with this feature:
1. coreNodeNames that suit your taste rather than the generic ones we make up.
Not very important, but something users can already be doing.
2. coreNodeName is the identity in the clusterstate - so you can make a new
SolrCore take over for an existing state. Like I described above.
If we need to do something that conflicts with this feature, we either need to
write code to let both things coexist, or we need to deprecate and wait till 5
to remove it or something.
> NPE when create a core with both explicite shard and coreNodeName
> ------------------------------------------------------------------
>
> Key: SOLR-5580
> URL: https://issues.apache.org/jira/browse/SOLR-5580
> Project: Solr
> Issue Type: Bug
> Affects Versions: 4.6
> Environment: OS:Red Hat Enterprise Linux Server release 6.4 (Santiago)
> Software:solr 4.6,
> jdk:OpenJDK Runtime Environment (rhel-2.3.4.1.el6_3-x86_64)
> OpenJDK 64-Bit Server VM (build 23.2-b09, mixed mode)
> Reporter: YouPeng Yang
> Assignee: Mark Miller
> Labels: core
> Fix For: 5.0, 4.7, 4.6.1
>
> Original Estimate: 0.5h
> Remaining Estimate: 0.5h
>
> In class org.apache.solr.cloud.Overseer the Line 360:
> ---------------------------------------------------------------------
> if (sliceName !=null && collectionExists &&
> !"true".equals(state.getCollection(collection).getStr("autoCreated"))) {
> Slice slice = state.getSlice(collection, sliceName);
> if (slice.getReplica(coreNodeName) == null) {
> log.info("core_deleted . Just return");
> return state;
> }
> }
> ---------------------------------------------------------------------
> the slice needs to be checked null .because when create a new core with both
> explicite shard and coreNodeName, the state.getSlice(collection, sliceName)
> may return a null.So it needs to be checked ,or there will be an
> NullpointException
> ---------------------------------------------------------------------
> if (sliceName !=null && collectionExists &&
> !"true".equals(state.getCollection(collection).getStr("autoCreated"))) {
> Slice slice = state.getSlice(collection, sliceName);
> if (slice != null && slice.getReplica(coreNodeName) == null) {
> log.info("core_deleted . Just return");
> return state;
> }
> }
> ---------------------------------------------------------------------
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