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https://issues.apache.org/jira/browse/SOLR-6306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14082481#comment-14082481
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Robert Muir commented on SOLR-6306:
-----------------------------------
Well it just means the format changed, several times during development.
Sometimes its just little changes like LUCENE-5750.
In general once we have an official release, the format for that version is
"frozen" and then we add backwards compatibility indexes and test for it. But
anything in between releases probably cannot be upgraded.
> Problem using Solr 4.9 index with 4.10 build (merge failures with DocValues?)
> -----------------------------------------------------------------------------
>
> Key: SOLR-6306
> URL: https://issues.apache.org/jira/browse/SOLR-6306
> Project: Solr
> Issue Type: Bug
> Affects Versions: 4.10
> Reporter: Brett Hoerner
>
> I have a SolrCloud cluster that has been running 4.9, I tried a 4.10 build as
> a test and our indexing slowed to a crawl. I noticed the number of segments
> (typically under 25) was up to 75 and climbing. In the logs it seems like
> merges were failing with the following.
> Happy to provide any other info as needed.
> {code}
> 15:06:24.624 [qtp1728790703-1634] ERROR o.a.solr.servlet.SolrDispatchFilter -
> null:java.io.IOException: background merge hit exception:
> _9n6s(4.9):C14802716/827586:delGen=97 _9nbh(4.9):C2903594/263527:delGen=100
> _9no8(4.9):C2190621/20968:delGen=58 _9nak(4.9):C712244/78919:delGen=100
> _9nfr(4.9):C686466/84576:delGen=97
> _9ngy(4.9):C679031/90147:delGen=96 _9ncx(4.9):C641773/81866:delGen=99
> _9nht(4.9):C415750/68337:delGen=94 _9mvj(4.9):C338961/39283:delGen=110
> _9nje(4.9):C215123/41594:delGen=87 _9nmn(4.9):C156084/40673:delGen=69
> _9nsk(4.9):C60958/7357:delGen=21 _9nka(4.9):C69625/22375:delGen=83
> _9nrl(4.9):C27522/4326:delGen=31 _9nqr(4.
> 9):C27216/7540:delGen=39 _9nqm(4.9):C24252/5597:delGen=40
> _9nto(4.9):C10324/1882:delGen=10 _9ntx(4.9):C9581/1218:delGen=8
> _9nts(4.9):C9731/1619:delGen=9 _9nv1(4.10):C3425
> _9ntz(4.9):C1437/919:delGen=8 _9nu7(4.10):C1130/697:delGen=5
> _9nuw(4.10):C611/218:delGen=2 _9nun(4.10):C625/308:delGen=3
> _9nug(4.10):C828/489:delGen
> =4 into _9nv2 [maxNumSegments=1]
> at
> org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1865)
> at
> org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1801)
> at
> org.apache.solr.update.DirectUpdateHandler2.commit(DirectUpdateHandler2.java:563)
> at
> org.apache.solr.update.processor.RunUpdateProcessor.processCommit(RunUpdateProcessorFactory.java:95)
> at
> org.apache.solr.update.processor.UpdateRequestProcessor.processCommit(UpdateRequestProcessor.java:64)
> at
> org.apache.solr.update.processor.DistributedUpdateProcessor.doLocalCommit(DistributedUpdateProcessor.java:1648)
> at
> org.apache.solr.update.processor.DistributedUpdateProcessor.processCommit(DistributedUpdateProcessor.java:1625)
> at
> org.apache.solr.handler.RequestHandlerUtils.handleCommit(RequestHandlerUtils.java:69)
> at
> org.apache.solr.handler.ContentStreamHandlerBase.handleRequestBody(ContentStreamHandlerBase.java:68)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:135)
> at org.apache.solr.core.SolrCore.execute(SolrCore.java:1963)
> at
> org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:777)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:418)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:207)
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
> at
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
> at
> org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
> at
> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1075)
> at
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:384)
> at
> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1009)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
> at
> org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
> at
> org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)
> at
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
> at org.eclipse.jetty.server.Server.handle(Server.java:368)
> at
> org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
> at
> org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:53)
> at
> org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:953)
> at
> org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1014)
> at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:861)
> at
> org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
> at
> org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:72)
> at
> org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:264)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
> at java.lang.Thread.run(Thread.java:744)
> Caused by: java.lang.IndexOutOfBoundsException
> at java.nio.Buffer.checkIndex(Buffer.java:546)
> at java.nio.DirectByteBuffer.getInt(DirectByteBuffer.java:681)
> at
> org.apache.lucene.store.ByteBufferIndexInput$SingleBufferImpl.readInt(ByteBufferIndexInput.java:480)
> at
> org.apache.lucene.util.packed.DirectReader$DirectPackedReader20.get(DirectReader.java:184)
> at
> org.apache.lucene.codecs.lucene49.Lucene49DocValuesProducer$1.get(Lucene49DocValuesProducer.java:351)
> at
> org.apache.lucene.codecs.lucene49.Lucene49DocValuesProducer$8.nextOrd(Lucene49DocValuesProducer.java:616)
> at
> org.apache.lucene.codecs.DocValuesConsumer.mergeSortedSetField(DocValuesConsumer.java:599)
> at
> org.apache.lucene.index.SegmentMerger.mergeDocValues(SegmentMerger.java:213)
> at org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:122)
> at
> org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4217)
> at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:3812)
> at
> org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:405)
> at
> org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:482)
> {code}
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