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https://issues.apache.org/jira/browse/SOLR-6744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15399848#comment-15399848
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Tomás Fernández Löbbe commented on SOLR-6744:
---------------------------------------------
I think the fix looks good. Maybe it would be better to check for the rename of
the id field outside of the loop instead?
Also, it would be nice if the test would also validate that the "id" field is
not included in the returned fields.
> fl renaming / alias of uniqueKey field generates null pointer exception in
> SolrCloud configuration
> --------------------------------------------------------------------------------------------------
>
> Key: SOLR-6744
> URL: https://issues.apache.org/jira/browse/SOLR-6744
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 4.10.1
> 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.
> Reporter: Garth Grimm
> Priority: Minor
> Attachments: SOLR-6744.patch
>
>
> 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...
> {code}
> <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>
> {code}
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