Major Description
When sending a schema update requests occasionally SchemaManager produces this error:
[junit4] 2> 508295 ERROR (qtp1376110895-5901) [n:127.0.0.1:48080_solr c:.system s:shard1 r:core_node2 x:.system_shard1_replica_n1] o.a.s.h.RequestHandlerBase org.apache.solr.common.SolrException: Error reading input String Can't find resource 'schema.xml' in classpath or '/configs/.system', cwd=/var/lib/jenkins/jobs/Lucene-Solr-tests-master/workspace/solr/build/solr-core/test/J5 [junit4] 2> at org.apache.solr.handler.SchemaHandler.handleRequestBody(SchemaHandler.java:94) [junit4] 2> at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:199) [junit4] 2> at org.apache.solr.core.SolrCore.execute(SolrCore.java:2566) [junit4] 2> at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:711) [junit4] 2> at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:516) [junit4] 2> at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:394) [junit4] 2> at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:340) [junit4] 2> at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610) [junit4] 2> at org.apache.solr.client.solrj.embedded.JettySolrRunner$DebugFilter.doFilter(JettySolrRunner.java:165) [junit4] 2> at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610) [junit4] 2> at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:540) [junit4] 2> at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255) [junit4] 2> at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1588) [junit4] 2> at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255) [junit4] 2> at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1345) [junit4] 2> at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203) [junit4] 2> at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:480) [junit4] 2> at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1557) [junit4] 2> at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201) [junit4] 2> at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1247) [junit4] 2> at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144) [junit4] 2> at org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:703) [junit4] 2> at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) [junit4] 2> at org.eclipse.jetty.server.Server.handle(Server.java:502) [junit4] 2> at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:364) [junit4] 2> at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260) [junit4] 2> at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305) [junit4] 2> at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) [junit4] 2> at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118) [junit4] 2> at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765) [junit4] 2> at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683) [junit4] 2> at java.lang.Thread.run(Thread.java:748) [junit4] 2> Caused by: org.apache.solr.core.SolrResourceNotFoundException: Can't find resource 'schema.xml' in classpath or '/configs/.system', cwd=/var/lib/jenkins/jobs/Lucene-Solr-tests-master/workspace/solr/build/solr-core/test/J5 [junit4] 2> at org.apache.solr.cloud.ZkSolrResourceLoader.openResource(ZkSolrResourceLoader.java:130) [junit4] 2> at org.apache.solr.schema.SchemaManager.getFreshManagedSchema(SchemaManager.java:422) [junit4] 2> at org.apache.solr.schema.SchemaManager.doOperations(SchemaManager.java:105) [junit4] 2> at org.apache.solr.schema.SchemaManager.performOperations(SchemaManager.java:83) [junit4] 2> at org.apache.solr.handler.SchemaHandler.handleRequestBody(SchemaHandler.java:90) [junit4] 2> ... 31 more
This happens for regular SolrCloud collections bootstrapped from file-based configs. If the configuration allows schema editing then solr.xml should be initially present in ZK, then it's replaced by managed-schema but a backup solr.xml.bak file still exists in ZK. In this situation SchemaManager should not complain about the missing solr.xml file.