[ 
https://issues.apache.org/jira/browse/SOLR-9983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15843309#comment-15843309
 ] 

Steve Rowe edited comment on SOLR-9983 at 1/27/17 6:44 PM:
-----------------------------------------------------------

My Jenkins had a failure: 
[http://jenkins.sarowe.net/job/Lucene-Solr-tests-master/9459/] (doesn't 
reproduce for me):

{noformat}
Checking out Revision 01878380226c5be6bfedc45b8fb6174de4181a7c 
(refs/remotes/origin/master)
[...]
   [junit4]   2> NOTE: reproduce with: ant test  
-Dtestcase=TestManagedSchemaThreadSafety -Dtests.method=testThreadSafety 
-Dtests.seed=932CA88E4A647823 -Dtests.slow=true -Dtests.locale=pl 
-Dtests.timezone=Brazil/Acre -Dtests.asserts=true -Dtests.file.encoding=UTF-8
   [junit4] ERROR   4.28s J6  | TestManagedSchemaThreadSafety.testThreadSafety 
<<<
   [junit4]    > Throwable #1: java.util.concurrent.ExecutionException: 
java.lang.RuntimeException: org.apache.solr.common.SolrException: Error loading 
solr config from solrconfig.xml
   [junit4]    >        at 
__randomizedtesting.SeedInfo.seed([932CA88E4A647823:966BCD699FBCAD5]:0)
   [junit4]    >        at 
java.util.concurrent.FutureTask.report(FutureTask.java:122)
   [junit4]    >        at 
java.util.concurrent.FutureTask.get(FutureTask.java:192)
   [junit4]    >        at 
org.apache.solr.schema.TestManagedSchemaThreadSafety.testThreadSafety(TestManagedSchemaThreadSafety.java:126)
   [junit4]    >        at java.lang.Thread.run(Thread.java:745)
   [junit4]    > Caused by: java.lang.RuntimeException: 
org.apache.solr.common.SolrException: Error loading solr config from 
solrconfig.xml
   [junit4]    >        at 
org.apache.solr.schema.TestManagedSchemaThreadSafety.lambda$indexSchemaLoader$0(TestManagedSchemaThreadSafety.java:159)
   [junit4]    >        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
   [junit4]    >        at 
java.util.concurrent.FutureTask.run(FutureTask.java:266)
   [junit4]    >        at 
org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:229)
   [junit4]    >        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
   [junit4]    >        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
   [junit4]    >        ... 1 more
   [junit4]    > Caused by: org.apache.solr.common.SolrException: Error loading 
solr config from solrconfig.xml
   [junit4]    >        at 
org.apache.solr.core.SolrConfig.readFromResourceLoader(SolrConfig.java:187)
   [junit4]    >        at 
org.apache.solr.schema.TestManagedSchemaThreadSafety.lambda$indexSchemaLoader$0(TestManagedSchemaThreadSafety.java:152)
   [junit4]    >        ... 6 more
   [junit4]    > Caused by: java.lang.NullPointerException
   [junit4]    >        at 
org.apache.solr.cloud.ZkSolrResourceLoader.openResource(ZkSolrResourceLoader.java:99)
   [junit4]    >        at 
org.apache.solr.core.SolrResourceLoader.openConfig(SolrResourceLoader.java:361)
   [junit4]    >        at org.apache.solr.core.Config.<init>(Config.java:120)
   [junit4]    >        at org.apache.solr.core.Config.<init>(Config.java:90)
   [junit4]    >        at 
org.apache.solr.core.SolrConfig.<init>(SolrConfig.java:202)
   [junit4]    >        at 
org.apache.solr.core.SolrConfig.readFromResourceLoader(SolrConfig.java:179)
   [junit4]    >        ... 7 more
   [junit4]   2> 565162 INFO  
(SUITE-TestManagedSchemaThreadSafety-seed#[932CA88E4A647823]-worker) [    ] 
o.a.s.c.ZkTestServer connecting to 127.0.0.1:52297 52297
   [junit4]   2> 565318 INFO  (Thread-1704) [    ] o.a.s.c.ZkTestServer 
connecting to 127.0.0.1:52297 52297
   [junit4]   2> 565318 INFO  
(SUITE-TestManagedSchemaThreadSafety-seed#[932CA88E4A647823]-worker) [    ] 
o.a.s.SolrTestCaseJ4 ###deleteCore
   [junit4]   2> NOTE: leaving temporary files on disk at: 
/var/lib/jenkins/jobs/Lucene-Solr-tests-master/workspace/solr/build/solr-core/test/J6/temp/solr.schema.TestManagedSchemaThreadSafety_932CA88E4A647823-001
   [junit4]   2> NOTE: test params are: codec=CheapBastard, 
sim=RandomSimilarity(queryNorm=true): {}, locale=pl, timezone=Brazil/Acre
   [junit4]   2> NOTE: Linux 4.1.0-custom2-amd64 amd64/Oracle Corporation 
1.8.0_77 (64-bit)/cpus=16,threads=1,free=311373568,total=520093696
   [junit4]   2> NOTE: All tests run in this JVM: 
[CdcrReplicationDistributedZkTest, CSVRequestHandlerTest, 
DocExpirationUpdateProcessorFactoryTest, FieldAnalysisRequestHandlerTest, 
HdfsTlogReplayBufferedWhileIndexingTest, 
DistribDocExpirationUpdateProcessorTest, TestMacros, SuggestComponentTest, 
TestDynamicFieldCollectionResource, TestBadConfig, 
TestSha256AuthenticationProvider, TestSolrCoreSnapshots, TestSolrCLIRunExample, 
WordBreakSolrSpellCheckerTest, JvmMetricsTest, TestHighlightDedupGrouping, 
TestShortCircuitedRequests, TestUseDocValuesAsStored, 
TestFieldCacheWithThreads, TestMiniSolrCloudCluster, TestSolrJ, 
TestExceedMaxTermLength, BlockJoinFacetRandomTest, MigrateRouteKeyTest, 
TestComplexPhraseQParserPlugin, CachingDirectoryFactoryTest, TestWriterPerf, 
DistributedSpellCheckComponentTest, TestStressRecovery, TestReplicationHandler, 
CloudExitableDirectoryReaderTest, DeleteInactiveReplicaTest, 
DistributedVersionInfoTest, SharedFSAutoReplicaFailoverTest, 
SharedFSAutoReplicaFailoverUtilsTest, SimpleCollectionCreateDeleteTest, 
TestConfigSetsAPIExclusivity, TestLeaderElectionWithEmptyReplica, 
TestRequestForwarding, TestTolerantUpdateProcessorRandomCloud, CoreSorterTest, 
HdfsDirectoryFactoryTest, HighlighterMaxOffsetTest, SolrGraphiteReporterTest, 
TestSchemaNameResource, ChangedSchemaMergeTest, DocValuesMissingTest, 
TestCollationFieldDocValues, TestManagedSchemaThreadSafety]
   [junit4] Completed [603/684 (2!)] on J6 in 4.57s, 1 test, 1 error <<< 
FAILURES!
{noformat}


was (Author: steve_rowe):
My Jenkins had a failure: 
[http://jenkins.sarowe.net/job/Lucene-Solr-tests-master/9459/]:

{noformat}
   [junit4]   2> NOTE: reproduce with: ant test  
-Dtestcase=TestManagedSchemaThreadSafety -Dtests.method=testThreadSafety 
-Dtests.seed=932CA88E4A647823 -Dtests.slow=true -Dtests.locale=pl 
-Dtests.timezone=Brazil/Acre -Dtests.asserts=true -Dtests.file.encoding=UTF-8
   [junit4] ERROR   4.28s J6  | TestManagedSchemaThreadSafety.testThreadSafety 
<<<
   [junit4]    > Throwable #1: java.util.concurrent.ExecutionException: 
java.lang.RuntimeException: org.apache.solr.common.SolrException: Error loading 
solr config from solrconfig.xml
   [junit4]    >        at 
__randomizedtesting.SeedInfo.seed([932CA88E4A647823:966BCD699FBCAD5]:0)
   [junit4]    >        at 
java.util.concurrent.FutureTask.report(FutureTask.java:122)
   [junit4]    >        at 
java.util.concurrent.FutureTask.get(FutureTask.java:192)
   [junit4]    >        at 
org.apache.solr.schema.TestManagedSchemaThreadSafety.testThreadSafety(TestManagedSchemaThreadSafety.java:126)
   [junit4]    >        at java.lang.Thread.run(Thread.java:745)
   [junit4]    > Caused by: java.lang.RuntimeException: 
org.apache.solr.common.SolrException: Error loading solr config from 
solrconfig.xml
   [junit4]    >        at 
org.apache.solr.schema.TestManagedSchemaThreadSafety.lambda$indexSchemaLoader$0(TestManagedSchemaThreadSafety.java:159)
   [junit4]    >        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
   [junit4]    >        at 
java.util.concurrent.FutureTask.run(FutureTask.java:266)
   [junit4]    >        at 
org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:229)
   [junit4]    >        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
   [junit4]    >        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
   [junit4]    >        ... 1 more
   [junit4]    > Caused by: org.apache.solr.common.SolrException: Error loading 
solr config from solrconfig.xml
   [junit4]    >        at 
org.apache.solr.core.SolrConfig.readFromResourceLoader(SolrConfig.java:187)
   [junit4]    >        at 
org.apache.solr.schema.TestManagedSchemaThreadSafety.lambda$indexSchemaLoader$0(TestManagedSchemaThreadSafety.java:152)
   [junit4]    >        ... 6 more
   [junit4]    > Caused by: java.lang.NullPointerException
   [junit4]    >        at 
org.apache.solr.cloud.ZkSolrResourceLoader.openResource(ZkSolrResourceLoader.java:99)
   [junit4]    >        at 
org.apache.solr.core.SolrResourceLoader.openConfig(SolrResourceLoader.java:361)
   [junit4]    >        at org.apache.solr.core.Config.<init>(Config.java:120)
   [junit4]    >        at org.apache.solr.core.Config.<init>(Config.java:90)
   [junit4]    >        at 
org.apache.solr.core.SolrConfig.<init>(SolrConfig.java:202)
   [junit4]    >        at 
org.apache.solr.core.SolrConfig.readFromResourceLoader(SolrConfig.java:179)
   [junit4]    >        ... 7 more
   [junit4]   2> 565162 INFO  
(SUITE-TestManagedSchemaThreadSafety-seed#[932CA88E4A647823]-worker) [    ] 
o.a.s.c.ZkTestServer connecting to 127.0.0.1:52297 52297
   [junit4]   2> 565318 INFO  (Thread-1704) [    ] o.a.s.c.ZkTestServer 
connecting to 127.0.0.1:52297 52297
   [junit4]   2> 565318 INFO  
(SUITE-TestManagedSchemaThreadSafety-seed#[932CA88E4A647823]-worker) [    ] 
o.a.s.SolrTestCaseJ4 ###deleteCore
   [junit4]   2> NOTE: leaving temporary files on disk at: 
/var/lib/jenkins/jobs/Lucene-Solr-tests-master/workspace/solr/build/solr-core/test/J6/temp/solr.schema.TestManagedSchemaThreadSafety_932CA88E4A647823-001
   [junit4]   2> NOTE: test params are: codec=CheapBastard, 
sim=RandomSimilarity(queryNorm=true): {}, locale=pl, timezone=Brazil/Acre
   [junit4]   2> NOTE: Linux 4.1.0-custom2-amd64 amd64/Oracle Corporation 
1.8.0_77 (64-bit)/cpus=16,threads=1,free=311373568,total=520093696
   [junit4]   2> NOTE: All tests run in this JVM: 
[CdcrReplicationDistributedZkTest, CSVRequestHandlerTest, 
DocExpirationUpdateProcessorFactoryTest, FieldAnalysisRequestHandlerTest, 
HdfsTlogReplayBufferedWhileIndexingTest, 
DistribDocExpirationUpdateProcessorTest, TestMacros, SuggestComponentTest, 
TestDynamicFieldCollectionResource, TestBadConfig, 
TestSha256AuthenticationProvider, TestSolrCoreSnapshots, TestSolrCLIRunExample, 
WordBreakSolrSpellCheckerTest, JvmMetricsTest, TestHighlightDedupGrouping, 
TestShortCircuitedRequests, TestUseDocValuesAsStored, 
TestFieldCacheWithThreads, TestMiniSolrCloudCluster, TestSolrJ, 
TestExceedMaxTermLength, BlockJoinFacetRandomTest, MigrateRouteKeyTest, 
TestComplexPhraseQParserPlugin, CachingDirectoryFactoryTest, TestWriterPerf, 
DistributedSpellCheckComponentTest, TestStressRecovery, TestReplicationHandler, 
CloudExitableDirectoryReaderTest, DeleteInactiveReplicaTest, 
DistributedVersionInfoTest, SharedFSAutoReplicaFailoverTest, 
SharedFSAutoReplicaFailoverUtilsTest, SimpleCollectionCreateDeleteTest, 
TestConfigSetsAPIExclusivity, TestLeaderElectionWithEmptyReplica, 
TestRequestForwarding, TestTolerantUpdateProcessorRandomCloud, CoreSorterTest, 
HdfsDirectoryFactoryTest, HighlighterMaxOffsetTest, SolrGraphiteReporterTest, 
TestSchemaNameResource, ChangedSchemaMergeTest, DocValuesMissingTest, 
TestCollationFieldDocValues, TestManagedSchemaThreadSafety]
   [junit4] Completed [603/684 (2!)] on J6 in 4.57s, 1 test, 1 error <<< 
FAILURES!
{noformat}

> TestManagedSchemaThreadSafety.testThreadSafety() failures
> ---------------------------------------------------------
>
>                 Key: SOLR-9983
>                 URL: https://issues.apache.org/jira/browse/SOLR-9983
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: Schema and Analysis
>    Affects Versions: master (7.0)
>            Reporter: Steve Rowe
>            Assignee: Mikhail Khludnev
>             Fix For: 6.5, master (7.0)
>
>         Attachments: SOLR-9983-connection-loss-retry.patch, SOLR-9983.patch, 
> tests-failures-TestManagedSchemaThreadSafety-724.txt
>
>
> I set up a Jenkins job to hammer all tests on the {{jira/solr-5944}} branch, 
> and at least four times this test failed (none of the seeds reproduce for 
> me): [http://jenkins.sarowe.net/job/Solr-tests-SOLR-5944/155/], 
> [http://jenkins.sarowe.net/job/Solr-tests-SOLR-5944/167/], 
> [http://jenkins.sarowe.net/job/Solr-tests-SOLR-5944/106/], 
> [http://jenkins.sarowe.net/job/Solr-tests-SOLR-5944/332/].  My email search 
> didn't turn up any failures on ASF or Policeman Jenkins. Here's the output 
> from one of the above runs:
> {noformat}
>    [junit4]   2> NOTE: reproduce with: ant test  
> -Dtestcase=TestManagedSchemaThreadSafety -Dtests.method=testThreadSafety 
> -Dtests.seed=3DB2B79301AA806B -Dtests.slow=true -Dtests.locale=lt 
> -Dtests.timezone=Asia/Anadyr -Dtests.asserts=true 
> -Dtests.file.encoding=US-ASCII
>    [junit4] ERROR   4.37s J4  | 
> TestManagedSchemaThreadSafety.testThreadSafety <<<
>    [junit4]    > Throwable #1: java.util.concurrent.ExecutionException: 
> java.lang.RuntimeException: org.apache.solr.common.SolrException: Error 
> loading solr config from solrconfig.xml
>    [junit4]    >      at 
> __randomizedtesting.SeedInfo.seed([3DB2B79301AA806B:A7F8A3CBD235329D]:0)
>    [junit4]    >      at 
> java.util.concurrent.FutureTask.report(FutureTask.java:122)
>    [junit4]    >      at 
> java.util.concurrent.FutureTask.get(FutureTask.java:192)
>    [junit4]    >      at 
> org.apache.solr.schema.TestManagedSchemaThreadSafety.testThreadSafety(TestManagedSchemaThreadSafety.java:126)
>    [junit4]    >      at java.lang.Thread.run(Thread.java:745)
>    [junit4]    > Caused by: java.lang.RuntimeException: 
> org.apache.solr.common.SolrException: Error loading solr config from 
> solrconfig.xml
>    [junit4]    >      at 
> org.apache.solr.schema.TestManagedSchemaThreadSafety.lambda$indexSchemaLoader$0(TestManagedSchemaThreadSafety.java:159)
>    [junit4]    >      at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>    [junit4]    >      at 
> java.util.concurrent.FutureTask.run(FutureTask.java:266)
>    [junit4]    >      at 
> org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:229)
>    [junit4]    >      at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>    [junit4]    >      at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>    [junit4]    >      ... 1 more
>    [junit4]    > Caused by: org.apache.solr.common.SolrException: Error 
> loading solr config from solrconfig.xml
>    [junit4]    >      at 
> org.apache.solr.core.SolrConfig.readFromResourceLoader(SolrConfig.java:187)
>    [junit4]    >      at 
> org.apache.solr.schema.TestManagedSchemaThreadSafety.lambda$indexSchemaLoader$0(TestManagedSchemaThreadSafety.java:152)
>    [junit4]    >      ... 6 more
>    [junit4]    > Caused by: java.lang.NullPointerException
>    [junit4]    >      at 
> org.apache.solr.cloud.ZkSolrResourceLoader.openResource(ZkSolrResourceLoader.java:99)
>    [junit4]    >      at 
> org.apache.solr.core.SolrResourceLoader.openConfig(SolrResourceLoader.java:361)
>    [junit4]    >      at org.apache.solr.core.Config.<init>(Config.java:120)
>    [junit4]    >      at org.apache.solr.core.Config.<init>(Config.java:90)
>    [junit4]    >      at 
> org.apache.solr.core.SolrConfig.<init>(SolrConfig.java:202)
>    [junit4]    >      at 
> org.apache.solr.core.SolrConfig.readFromResourceLoader(SolrConfig.java:179)
>    [junit4]    >      ... 7 more
> {noformat}
> Looks to me like this is a test bug: the test mocks {{ZkController}}, but the 
> mock returns null for (the uninitialized {{cc}} returned by) 
> {{getCoreContainer()}}, which is called when the ZK session expires in 
> {{ZkSolrResourceLoader.openResource()}}.  The NPE is triggered when 
> {{isShutdown()}} is called on the null core container:
> {code:java|title=ZkSolrResourceLoader.java}
>  97: } catch (KeeperException.SessionExpiredException e) {
>  98:   exception = e;
>  99:   if (!zkController.getCoreContainer().isShutDown()) {
> 100:     // Retry in case of session expiry
> {code}



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