Jessica Cheng created SOLR-5319:
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Summary: Collection ZK nodes do not reflect the correct router
chosen
Key: SOLR-5319
URL: https://issues.apache.org/jira/browse/SOLR-5319
Project: Solr
Issue Type: Bug
Components: SolrCloud
Affects Versions: 4.4, 4.5, 5.0
Reporter: Jessica Cheng
In ZkController.createCollectionZkNode, the doc router is determined by this
code snippet:
if (collectionProps.get(DocCollection.DOC_ROUTER) == null) {
Object numShards =
collectionProps.get(ZkStateReader.NUM_SHARDS_PROP);
if (numShards == null) {
numShards = System.getProperty(ZkStateReader.NUM_SHARDS_PROP);
}
if (numShards == null) {
collectionProps.put(DocCollection.DOC_ROUTER,
ImplicitDocRouter.NAME);
} else {
collectionProps.put(DocCollection.DOC_ROUTER,
DocRouter.DEFAULT_NAME);
}
}
Since OverseerCollectionProcessor never passes on any params prefixed with
"collection" other than "collection.configName" in its create core commands,
collectionProps.get(DocCollection.DOC_ROUTER) will never be non-null. Thus, it
needs to figure out if the router is implicit or compositeID based on if
numShards is passed in. However,
collectionProps.get(ZkStateReader.NUM_SHARDS_PROP) will also always be null for
the same reason collectionProps.get(DocCollection.DOC_ROUTER) is null, and it
isn't explicitly set in the code above, so the only way for numShards not to be
null is if it's passed in as a system property.
As an example, here's a cluster state that's created as compositeId router, but
the collection ZK node says it's implicit:
in clusterstate.json:
"example":{
"shards":{"shard1":{
"range":"80000000-7fffffff",
"state":"active",
"replicas":{"core_node1":{
"state":"active",
"core":"example_shard1_replica1",
"node_name":"localhost:8983_solr",
"base_url":"http://localhost:8983/solr";,
"leader":"true"}}}},
"router":"compositeId"},
in /collections/example data:
{
"configName":"myconf",
"router":"implicit"}
I've not sure if the collection ZK node router info is actually used anywhere,
so it may not matter, but it's confusing.
I think the best fix is for OverseerCollectionProcessor to pass on params
prefixed with "collection." to the core creation requests. Otherwise,
ZkController.createCollectionZkNode can explicitly set the numShards
collectionProps by cd.getNumShards() too.
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