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https://issues.apache.org/jira/browse/SOLR-5580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13858863#comment-13858863
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Mark Miller commented on SOLR-5580:
-----------------------------------
If you have 2 replicas and one machine blows up, you now have two replicas
registered and one running. If you buy a new machine, you can now tell it to
take over for the machine that blew up rather than having a replica in the
state that will never come back or having to remove it manually. This is a
feature that cannot simply be removed unceremoniously in a point release.
User coreNodeNames is a current, supported feature...
> 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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