janhoy commented on code in PR #1321:
URL: https://github.com/apache/solr/pull/1321#discussion_r1093285558
##########
solr/bin/solr.in.sh:
##########
@@ -83,6 +83,12 @@
# By default Solr will try to connect to Zookeeper with 30 seconds in timeout;
override the timeout if needed
#SOLR_WAIT_FOR_ZK="30"
+# By default Solr will delete cores that are not registered in Zookeeper at
startup;
+# set to "true" to disable that behavior and preserve unknown cores so that
you can
+# delete them manually. This may protect against misconfiguration (e.g.
connecting
+# to the wrong Zookeeper instance or chroot).
+#SOLR_PRESERVE_UNKNOWN_CORES="true"
Review Comment:
We normally use the default value as the commented-out value in solr.in.sh,
so this would be `false`.
##########
solr/core/src/java/org/apache/solr/core/CoreContainer.java:
##########
@@ -1655,8 +1655,22 @@ private SolrCore createFromDescriptor(
} catch (Exception e) {
coreInitFailures.put(dcore.getName(), new CoreLoadFailure(dcore, e));
if (e instanceof ZkController.NotInClusterStateException &&
!newCollection) {
- // this mostly happen when the core is deleted when this node is down
- unload(dcore.getName(), true, true, true);
+ // this mostly happens when the core is deleted when this node is down
+ // but it can also happen if connecting to the wrong zookeeper
+ final boolean preserveUnknownCores =
Boolean.getBoolean("preserveUnknownCores");
Review Comment:
Can we perhaps prefix all sysprops with `solr.` since many other libraries
may also read system properties, and sooner or later there will be a name clash.
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