If there is only one core, let it be the default without specifying a default
in solr.xml
-----------------------------------------------------------------------------------------
Key: SOLR-3182
URL: https://issues.apache.org/jira/browse/SOLR-3182
Project: Solr
Issue Type: Improvement
Components: multicore
Affects Versions: 3.6, 4.0
Reporter: Russell Black
Priority: Minor
Our particular need for this is as follows. We operate in a sharded
environment with one core per server. Each shard also acts as a collator. We
want to use a hardware load balancer to choose which shard will do the
collation for each query. But in order to do that, each server's single core
would have to carry the same name so that it could be accessed by the same url
across servers. However we name the cores by their shard number
(query0,query1,...) because it parallels with the way we name our
indexing/master cores (index0, index1,...). This naming convention also gives
us the flexibility of moving to a multicore environment in the future without
having to rename the cores, although admittedly that would complicate load
balancing.
In a system with a large number of shards and the anticipation of adding more
going forward, setting a defaultCoreName attribute in each solr.xml file
becomes inconvenient, especially since there is no Solr admin API for setting
defaultCoreName. It would have to be done by hand or with some automated tool
we would write in house. Even if there were an API, logically it seems
unnecessary to have to declare the only core to be the default.
Fortunately this behavior can be implemented with the following simple patch:
{code}
Index: solr/core/src/java/org/apache/solr/core/CoreContainer.java
===================================================================
--- solr/core/src/java/org/apache/solr/core/CoreContainer.java (revision
1295204)
+++ solr/core/src/java/org/apache/solr/core/CoreContainer.java (working copy)
@@ -870,6 +870,13 @@
}
private String checkDefault(String name) {
+ // if there is only one core, let it be the default without specifying a
default in solr.xml
+ if (defaultCoreName.trim().length() == 0 && name.trim().length() == 0 &&
cores.size() == 1) {
+ SolrCore onlyCore = cores.get(0);
+ if(onlyCore != null) {
+ return onlyCore.getName();
+ }
+ }
return name.length() == 0 || defaultCoreName.equals(name) ||
name.trim().length() == 0 ? "" : name;
}
{code}
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