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https://issues.apache.org/jira/browse/SOLR-10428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16492891#comment-16492891
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Shawn Heisey commented on SOLR-10428:
-------------------------------------
The collection parameter that is mentioned on the wiki page you linked is a URL
parameter. To use that kind of syntax with SolrJ, you would use this code:
{code:java}
params.set("collection","alias-a,alias-b");
solrClient.query(params, SolrRequest.METHOD.POST)
{code}
The way your code supplies the collection parameter on the works differently.
I think that SolrJ puts the provided collection into the URL path -- if you use
XXXX, SolrJ sends to http://host:port/solr/XXXX as the base URL. I have not
verified 100% that this is the case, but I think that is how it works.
> CloudSolrClient: Qerying multiple collection aliases leads to SolrException:
> Collection not found
> -------------------------------------------------------------------------------------------------
>
> Key: SOLR-10428
> URL: https://issues.apache.org/jira/browse/SOLR-10428
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrJ
> Affects Versions: 6.4, 6.4.1, 6.4.2, 6.5, 7.0
> Reporter: Philip Pock
> Priority: Minor
>
> We have multiple collections and an alias is created for each of them. e.g.:
> alias-a -> collection-a, alias-b -> collection-b
> We search in multiple collections by passing the aliases of the collections
> in the collections parameter.
> {code}solrClient.query("alias-a,alias-b", params,
> SolrRequest.METHOD.POST){code}
> The client can't find the collection and throws an Exception. Relevant parts
> of the stacktrace using v6.5.0:
> {noformat}
> org.apache.solr.common.SolrException: Collection not found: collection-a
> at
> org.apache.solr.client.solrj.impl.CloudSolrClient.getCollectionNames(CloudSolrClient.java:1394)
> at
> org.apache.solr.client.solrj.impl.CloudSolrClient.requestWithRetryOnStaleState(CloudSolrClient.java:1087)
> at
> org.apache.solr.client.solrj.impl.CloudSolrClient.request(CloudSolrClient.java:1057)
> at
> org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:160)
> at org.apache.solr.client.solrj.SolrClient.query(SolrClient.java:974)
> {noformat}
> Everything works fine with a single alias.
> I think this issue was introduced with SOLR-9784. Please see my comment below.
> {code:title=org.apache.solr.client.solrj.impl.CloudSolrClient }
> Set<String> getCollectionNames(String collection) {
> List<String> rawCollectionsList = StrUtils.splitSmart(collection, ",",
> true);
> Set<String> collectionNames = new HashSet<>();
> for (String collectionName : rawCollectionsList) {
> if (stateProvider.getState(collectionName) == null) {
> // I assume that collectionName should be passed to getAlias here
> String alias = stateProvider.getAlias(collection);
> if (alias != null) {
> List<String> aliasList = StrUtils.splitSmart(alias, ",", true);
> collectionNames.addAll(aliasList);
> continue;
> }
> throw new SolrException(ErrorCode.BAD_REQUEST, "Collection not
> found: " + collectionName);
> }
> collectionNames.add(collectionName);
> }
> return collectionNames;
> }
> {code}
> The suggested change is similar to the previous revision:
> https://github.com/apache/lucene-solr/commit/5650939a8d41b7bad584947a2c9dcedf3774b8de#diff-c8d54eacd46180b332c86c7ae448abaeL1301
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