[SOLR-6744] fl renaming / alias of uniqueKey field generates null pointer exception in SolrCloud configuration

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 4.10.1
• Fix Version/s: 6.2.1, 6.3, 7.0
• Component/s: SolrCloud

Environment

Multiple replicas on SolrCloud config. This specific example with 4 shard, 3 replica per shard config. This bug does NOT exist when query is handled by single core.

• Assignee: Tomas Eduardo Fernandez Lobbe
• Reporter: Garth Grimm
• Created: 15/Nov/14 14:25
• Updated: 02/Oct/19 17:30
• Resolved: 12/Sep/16 11:57

Description

If trying to rename the uniqueKey field using 'fl' in a distributed query (ie: SolrCloud config), an NPE is thrown.

The workarround is to redundently request the uniqueKey field, once with the desired alias, and once with the original name

Example...

http://localhost:8983/solr/cloudcollection/select?q=*%3A*&wt=xml&indent=true&fl=key:id

Work around:

http://localhost:8983/solr/cloudcollection/select?q=*%3A*&wt=xml&indent=true&fl=key:id&fl=id

Error w/o work around...

<response><lst name="responseHeader"><int name="status">500</int><int name="QTime">11</int><lst name="params"><str name="q">*:*</str><str name="indent">true</str><str name="fl">key:id</str><str name="wt">xml</str></lst></lst><lst name="error"><str name="trace">java.lang.NullPointerException
	at org.apache.solr.handler.component.QueryComponent.returnFields(QueryComponent.java:1257)
	at org.apache.solr.handler.component.QueryComponent.handleRegularResponses(QueryComponent.java:720)
	at org.apache.solr.handler.component.QueryComponent.handleResponses(QueryComponent.java:695)
	at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:324)
	at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:135)
	at org.apache.solr.core.SolrCore.execute(SolrCore.java:1967)
	at org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:777)
	at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:418)
	at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:207)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1075)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:384)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1009)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
	at org.eclipse.jetty.server.Server.handle(Server.java:368)
	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
	at org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:53)
	at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:942)
	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1004)
	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:640)
	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
	at org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:72)
	at org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:264)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
	at java.lang.Thread.run(Thread.java:745)
</str><int name="code">500</int></lst></response>