[jira] [Created] (SOLR-7401) NPE when concurrently creating and deleting collections

["Shai Erera (JIRA)" <ji...@apache.org>]

Shai Erera created SOLR-7401:
--------------------------------

             Summary: NPE when concurrently creating and deleting collections
                 Key: SOLR-7401
                 URL: https://issues.apache.org/jira/browse/SOLR-7401
             Project: Solr
          Issue Type: Bug
          Components: SolrCloud
            Reporter: Shai Erera
            Assignee: Shai Erera


I've hit this when multiple tests run against the same Solr server. Some tests create a collection, do some stuff and then delete it, but there are two tests which create+delete a collection, and then assert it doesn't exist by searching it (expecting to hit an exception). While I think this isn't the best way to assert a collection doesn't exist (I intend to change this assert to use a LIST command), it did surface this concurrency bug.

{noformat}
java.lang.NullPointerException
	at java.util.ArrayList.addAll(ArrayList.java:577)
	at org.apache.solr.servlet.SolrDispatchFilter.getSlicesForCollections(SolrDispatchFilter.java:731)
	at org.apache.solr.servlet.SolrDispatchFilter.getRemotCoreUrl(SolrDispatchFilter.java:669)
{noformat}

The problem is that getSlicesForCollections may get a CollectionRef whose collection value may be {{null}}, therefore attempting to add {{null}} to the list. I reproduced in a test, and fixed the bug.



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