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https://issues.apache.org/jira/browse/SOLR-13368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16812241#comment-16812241
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ASF subversion and git services commented on SOLR-13368:
--------------------------------------------------------
Commit 0859be134db8abb5d7cf68dd49baa51acf8d0c44 in lucene-solr's branch
refs/heads/master from Andrzej Bialecki
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=0859be1 ]
SOLR-13368: Tentative fix for a race condition in managed schema initialization.
> SchemaManager failures when processing schema update requests
> -------------------------------------------------------------
>
> Key: SOLR-13368
> URL: https://issues.apache.org/jira/browse/SOLR-13368
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 8.0, 8.1, master (9.0)
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Major
> Attachments: SOLR-13368.patch
>
>
> When sending a schema update requests occasionally {{SchemaManager}} produces
> this error:
> {code:java}
> [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
> {code}
> 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.
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