[SOLR-11406] Solr 7.0 cannot read indexes from 6.x versions

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 7.0
• Fix Version/s: 7.0.1, 7.1, 8.0

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)

• Assignee: Steven Rowe
• Reporter: Shawn Heisey
• Created: 27/Sep/17 16:02
• Updated: 23/Jul/19 15:57
• Resolved: 29/Sep/17 20:45

Description

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:

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

Issue Links

• duplicates: SOLR-8930 Solve the 6.0->7.0 index compatibility issue
• is broken by: LUCENE-7756 Only record the major that was used to create the index rather than the full version
• is related to: SOLR-5970 Create collection API always has status 0