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https://issues.apache.org/jira/browse/SOLR-11406?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Rowe updated SOLR-11406:
------------------------------
Attachment: SOLR-11406.patch
bq. I'll try switching to a simple loop; I expect it won't have the same
problem.
Patch, fixes the issue for me.
I'm going to look at creating back-compat tests.
> Solr 7.0 cannot read indexes from 6.x versions
> ----------------------------------------------
>
> Key: SOLR-11406
> URL: https://issues.apache.org/jira/browse/SOLR-11406
> Project: Solr
> Issue Type: Bug
> Affects Versions: 7.0
> Environment: C:\Users\sheisey\Downloads\solr-7.0.0>ver
> Microsoft Windows [Version 6.1.7601]
> C:\Users\sheisey\Downloads\solr-7.0.0>java -version
> java version "1.8.0_144"
> Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
> Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)
> Reporter: Shawn Heisey
> Attachments: SOLR-11406.patch
>
>
> Reproduced a user problem from the mailing list.
> Steps:
> * Start Solr 6.6.0 from an extracted download with "bin/solr start"
> * Create a core: "bin/solr create -c foo"
> * Add documents with the admin UI
> * Stop Solr
> * Copy solr-6.6.0/server/solr/foo to solr-7.0.0/server/solr in extracted
> Solr 7.0 download
> * Start Solr 7.0 with "bin/solr start"
> (I was on Windows, so I used backslashes everywhere these steps have forward
> slashes)
> Solr will be unable to start the core. Error and stacktrace:
> {code}
> 2017-09-27 15:13:30.050 ERROR (coreContainerWorkExecutor-2-thread-1) [ ]
> o.a.s.c.CoreContainer Error waiting for SolrCore to be created
> java.util.concurrent.ExecutionException:
> org.apache.solr.common.SolrException: Unable to create core [foo]
> at java.util.concurrent.FutureTask.report(FutureTask.java:122)
> at java.util.concurrent.FutureTask.get(FutureTask.java:192)
> at
> org.apache.solr.core.CoreContainer.lambda$load$118(CoreContainer.java:647)
> at
> com.codahale.metrics.InstrumentedExecutorService$InstrumentedRunnable.run(InstrumentedExecutorService.java:176)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$128(ExecutorUtil.java:188)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> Caused by: org.apache.solr.common.SolrException: Unable to create core [foo]
> at
> org.apache.solr.core.CoreContainer.createFromDescriptor(CoreContainer.java:996)
> at
> org.apache.solr.core.CoreContainer.lambda$load$117(CoreContainer.java:619)
> at
> com.codahale.metrics.InstrumentedExecutorService$InstrumentedCallable.call(InstrumentedExecutorService.java:197)
> ... 5 more
> Caused by: org.apache.solr.common.SolrException: Error opening new searcher
> at org.apache.solr.core.SolrCore.<init>(SolrCore.java:988)
> at org.apache.solr.core.SolrCore.<init>(SolrCore.java:843)
> at
> org.apache.solr.core.CoreContainer.createFromDescriptor(CoreContainer.java:980)
> ... 7 more
> Caused by: org.apache.solr.common.SolrException: Error opening new searcher
> at org.apache.solr.core.SolrCore.openNewSearcher(SolrCore.java:2066)
> at org.apache.solr.core.SolrCore.getSearcher(SolrCore.java:2186)
> at org.apache.solr.core.SolrCore.initSearcher(SolrCore.java:1071)
> at org.apache.solr.core.SolrCore.<init>(SolrCore.java:960)
> ... 9 more
> Caused by: java.lang.NullPointerException
> at java.util.Objects.requireNonNull(Objects.java:203)
> at java.util.Optional.<init>(Optional.java:96)
> at java.util.Optional.of(Optional.java:108)
> at java.util.stream.ReduceOps$2ReducingSink.get(ReduceOps.java:129)
> at java.util.stream.ReduceOps$2ReducingSink.get(ReduceOps.java:107)
> at
> java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
> at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
> at java.util.stream.ReferencePipeline.reduce(ReferencePipeline.java:479)
> at
> org.apache.solr.index.SlowCompositeReaderWrapper.<init>(SlowCompositeReaderWrapper.java:76)
> at
> org.apache.solr.index.SlowCompositeReaderWrapper.wrap(SlowCompositeReaderWrapper.java:57)
> at
> org.apache.solr.search.SolrIndexSearcher.<init>(SolrIndexSearcher.java:252)
> at org.apache.solr.core.SolrCore.openNewSearcher(SolrCore.java:2034)
> ... 12 more
> {code}
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