Hello all,

We’re using Solr for our e-commerce platform since many years. We do a lot of 
real-time updates and rely on the atomic updates mostly to update the 
documents. We ran into an issue with the atomic updates with add-distinct on 
the production environment, where we are getting NullPointerException.

Input document: [SolrInputDocument(fields: [id=10001, 
promotionType={add-distinct=WHOLESALE}, lastUpdatedTime={set=1711433462524}])],

update field definition: <field name="promotionType" type="string" 
docValues="true" multiValued="true" indexed="false" stored="true"/>

Solr version: 8.11.2 running on Cloud mode.

We were unable to replicate this locally (solr setup in cloud mode running 
single sharded collection with only few doucments) while on production we have 
millions of docs in multi-sharded collection.

Attaching the logs:
org.apache.solr.client.solrj.impl.CloudSolrClient$RouteException: Error from 
server at {hostname}/solr/collection_shard6_replica_t2737: 
java.lang.NullPointerException     at 
org.apache.solr.update.processor.AtomicUpdateDocumentMerger.doAddDistinct(AtomicUpdateDocumentMerger.java:466)
   at 
org.apache.solr.update.processor.AtomicUpdateDocumentMerger.mergeDocHavingSameId(AtomicUpdateDocumentMerger.java:174)
    at 
org.apache.solr.update.processor.AtomicUpdateDocumentMerger.mergeChildDocRecursive(AtomicUpdateDocumentMerger.java:115)
  at 
org.apache.solr.update.processor.AtomicUpdateDocumentMerger.merge(AtomicUpdateDocumentMerger.java:106)
   at 
org.apache.solr.update.processor.DistributedUpdateProcessor.getUpdatedDocument(DistributedUpdateProcessor.java:730)
  at 
org.apache.solr.update.processor.DistributedUpdateProcessor.doVersionAdd(DistributedUpdateProcessor.java:380)
    at 
org.apache.solr.update.processor.DistributedUpdateProcessor.lambda$versionAdd$0(DistributedUpdateProcessor.java:343)
     at org.apache.solr.update.VersionBucket.runWithLock(VersionBucket.java:50) 
 at 
org.apache.solr.update.processor.DistributedUpdateProcessor.versionAdd(DistributedUpdateProcessor.java:343)
  at 
org.apache.solr.update.processor.DistributedUpdateProcessor.processAdd(DistributedUpdateProcessor.java:229)
  at 
org.apache.solr.update.processor.DistributedZkUpdateProcessor.processAdd(DistributedZkUpdateProcessor.java:245)
  at 
org.apache.solr.handler.loader.JavabinLoader$1.update(JavabinLoader.java:110)   
 at 
org.apache.solr.client.solrj.request.JavaBinUpdateRequestCodec$StreamingCodec.readOuterMostDocIterator(JavaBinUpdateRequestCodec.java:344)
   at 
org.apache.solr.client.solrj.request.JavaBinUpdateRequestCodec$StreamingCodec.readIterator(JavaBinUpdateRequestCodec.java:292)
   at 
org.apache.solr.common.util.JavaBinCodec.readObject(JavaBinCodec.java:338)   at 
org.apache.solr.common.util.JavaBinCodec.readVal(JavaBinCodec.java:283)  at 
org.apache.solr.client.solrj.request.JavaBinUpdateRequestCodec$StreamingCodec.readNamedList(JavaBinUpdateRequestCodec.java:245)
  at org.apache.solr.common.util.JavaBinCodec.readObject(JavaBinCodec.java:303) 
  at org.apache.solr.common.util.JavaBinCodec.readVal(JavaBinCodec.java:283)  
at org.apache.solr.common.util.JavaBinCodec.unmarshal(JavaBinCodec.java:196)    
at 
org.apache.solr.client.solrj.request.JavaBinUpdateRequestCodec.unmarshal(JavaBinUpdateRequestCodec.java:131)
     at 
org.apache.solr.handler.loader.JavabinLoader.parseAndLoadDocs(JavabinLoader.java:122)
    at org.apache.solr.handler.loader.JavabinLoader.load(JavabinLoader.java:70) 
    at 
org.apache.solr.handler.UpdateRequestHandler$1.load(UpdateRequestHandler.java:97)
    at 
org.apache.solr.handler.ContentStreamHandlerBase.handleRequestBody(ContentStreamHandlerBase.java:82)
     at 
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:216)
    at org.apache.solr.core.SolrCore.execute(SolrCore.java:2637)    at 
org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:791)  at 
org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:564)     at 
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:427)
     at 
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:357)
     at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:201)  
 at 
org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1601)
    at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:548)   at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)   
 at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:600) 
 at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) 
 at 
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235)
    at 
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1624)
   at 
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
    at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1434)
   at 
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188)
     at 
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:501)    at 
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1594)
    at 
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186)
     at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1349)
    at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)   
 at 
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:191)
  at 
org.eclipse.jetty.server.handler.InetAccessHandler.handle(InetAccessHandler.java:177)
    at 
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:146)
    at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) 
 at 
org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:322)
     at 
org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:763)  
 at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) 
 at org.eclipse.jetty.server.Server.handle(Server.java:516)  at 
org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:400)   at 
org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:645)  at 
org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:392)    at 
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:277)  at 
org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
  at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105)    at 
org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104)     at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:338)
   at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:315)
     at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:173)
    at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131)
   at 
org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:409)
     at 
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:883)
     at 
org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1034)
    at java.base/java.lang.Thread.run(Thread.java:829)      at 
org.apache.solr.client.solrj.impl.CloudSolrClient.getRouteException(CloudSolrClient.java:125)
    at 
org.apache.solr.client.solrj.impl.CloudSolrClient.getRouteException(CloudSolrClient.java:46)
     at 
org.apache.solr.client.solrj.impl.BaseCloudSolrClient.directUpdate(BaseCloudSolrClient.java:579)
     at 
org.apache.solr.client.solrj.impl.BaseCloudSolrClient.sendRequest(BaseCloudSolrClient.java:1076)
     at 
org.apache.solr.client.solrj.impl.BaseCloudSolrClient.requestWithRetryOnStaleState(BaseCloudSolrClient.java:934)
     at 
org.apache.solr.client.solrj.impl.BaseCloudSolrClient.request(BaseCloudSolrClient.java:866)
  at org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:214)   
at org.apache.solr.client.solrj.SolrClient.add(SolrClient.java:106)     at 
org.apache.solr.client.solrj.SolrClient.add(SolrClient.java:71)  at 
org.apache.solr.client.solrj.SolrClient.add(SolrClient.java:85)  at 
com.gdn.x.search.service.impl.SolrDataServiceV2Impl.redirectUpdateRequest(SolrDataServiceV2Impl.java:708)
    at 
com.gdn.x.search.service.impl.SolrDataServiceV2Impl.updateAndHandleException(SolrDataServiceV2Impl.java:806)
     at 
com.gdn.x.search.service.impl.SolrDataServiceV2Impl.updateThrottler(SolrDataServiceV2Impl.java:757)
  at 
com.gdn.x.search.service.impl.SolrDataServiceV2Impl.update(SolrDataServiceV2Impl.java:880)
   at 
com.gdn.x.search.service.impl.SolrDataServiceV2Impl.lambda$atomicUpdateList$61(SolrDataServiceV2Impl.java:2031)
  at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)   at 
com.gdn.x.search.other.service.helper.wrapper.ContextAwarePoolExecutor.lambda$wrap$0(ContextAwarePoolExecutor.java:35)
   at 
datadog.trace.bootstrap.instrumentation.java.concurrent.Wrapper.run(Wrapper.java:46)
     at 
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at 
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.base/java.lang.Thread.run(Thread.java:834) Caused by: 
org.apache.solr.client.solrj.impl.HttpSolrClient$RemoteSolrException: Error 
from server at {hostname}/solr/collection_shard6_replica_t2737: 
java.lang.NullPointerException    at 
org.apache.solr.update.processor.AtomicUpdateDocumentMerger.doAddDistinct(AtomicUpdateDocumentMerger.java:466)
   at 
org.apache.solr.update.processor.AtomicUpdateDocumentMerger.mergeDocHavingSameId(AtomicUpdateDocumentMerger.java:174)
    at 
org.apache.solr.update.processor.AtomicUpdateDocumentMerger.mergeChildDocRecursive(AtomicUpdateDocumentMerger.java:115)
  at 
org.apache.solr.update.processor.AtomicUpdateDocumentMerger.merge(AtomicUpdateDocumentMerger.java:106)
   at 
org.apache.solr.update.processor.DistributedUpdateProcessor.getUpdatedDocument(DistributedUpdateProcessor.java:730)
  at 
org.apache.solr.update.processor.DistributedUpdateProcessor.doVersionAdd(DistributedUpdateProcessor.java:380)
    at 
org.apache.solr.update.processor.DistributedUpdateProcessor.lambda$versionAdd$0(DistributedUpdateProcessor.java:343)
     at org.apache.solr.update.VersionBucket.runWithLock(VersionBucket.java:50) 
 at 
org.apache.solr.update.processor.DistributedUpdateProcessor.versionAdd(DistributedUpdateProcessor.java:343)
  at 
org.apache.solr.update.processor.DistributedUpdateProcessor.processAdd(DistributedUpdateProcessor.java:229)
  at 
org.apache.solr.update.processor.DistributedZkUpdateProcessor.processAdd(DistributedZkUpdateProcessor.java:245)
  at 
org.apache.solr.handler.loader.JavabinLoader$1.update(JavabinLoader.java:110)   
 at 
org.apache.solr.client.solrj.request.JavaBinUpdateRequestCodec$StreamingCodec.readOuterMostDocIterator(JavaBinUpdateRequestCodec.java:344)
   at 
org.apache.solr.client.solrj.request.JavaBinUpdateRequestCodec$StreamingCodec.readIterator(JavaBinUpdateRequestCodec.java:292)
   at 
org.apache.solr.common.util.JavaBinCodec.readObject(JavaBinCodec.java:338)   at 
org.apache.solr.common.util.JavaBinCodec.readVal(JavaBinCodec.java:283)  at 
org.apache.solr.client.solrj.request.JavaBinUpdateRequestCodec$StreamingCodec.readNamedList(JavaBinUpdateRequestCodec.java:245)
  at org.apache.solr.common.util.JavaBinCodec.readObject(JavaBinCodec.java:303) 
  at org.apache.solr.common.util.JavaBinCodec.readVal(JavaBinCodec.java:283)  
at org.apache.solr.common.util.JavaBinCodec.unmarshal(JavaBinCodec.java:196)    
at 
org.apache.solr.client.solrj.request.JavaBinUpdateRequestCodec.unmarshal(JavaBinUpdateRequestCodec.java:131)
     at 
org.apache.solr.handler.loader.JavabinLoader.parseAndLoadDocs(JavabinLoader.java:122)
    at org.apache.solr.handler.loader.JavabinLoader.load(JavabinLoader.java:70) 
    at 
org.apache.solr.handler.UpdateRequestHandler$1.load(UpdateRequestHandler.java:97)
    at 
org.apache.solr.handler.ContentStreamHandlerBase.handleRequestBody(ContentStreamHandlerBase.java:82)
     at 
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:216)
    at org.apache.solr.core.SolrCore.execute(SolrCore.java:2637)    at 
org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:791)  at 
org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:564)     at 
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:427)
     at 
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:357)
     at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:201)  
 at 
org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1601)
    at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:548)   at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)   
 at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:600) 
 at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) 
 at 
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235)
    at 
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1624)
   at 
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
    at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1434)
   at 
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188)
     at 
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:501)    at 
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1594)
    at 
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186)
     at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1349)
    at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)   
 at 
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:191)
  at 
org.eclipse.jetty.server.handler.InetAccessHandler.handle(InetAccessHandler.java:177)
    at 
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:146)
    at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) 
 at 
org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:322)
     at 
org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:763)  
 at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) 
 at org.eclipse.jetty.server.Server.handle(Server.java:516)  at 
org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:400)   at 
org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:645)  at 
org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:392)    at 
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:277)  at 
org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
  at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105)    at 
org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104)     at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:338)
   at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:315)
     at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:173)
    at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131)
   at 
org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:409)
     at 
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:883)
     at 
org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1034)
    at java.base/java.lang.Thread.run(Thread.java:829)      at 
org.apache.solr.client.solrj.impl.HttpSolrClient.executeMethod(HttpSolrClient.java:681)
  at 
org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:266)
    at 
org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:248)
    at 
org.apache.solr.client.solrj.impl.LBSolrClient.doRequest(LBSolrClient.java:369) 
 at 
org.apache.solr.client.solrj.impl.LBSolrClient.request(LBSolrClient.java:297)   
 at 
org.apache.solr.client.solrj.impl.BaseCloudSolrClient.lambda$directUpdate$0(BaseCloudSolrClient.java:555)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)   at 
org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:218)
  ... 4 common frames omitted

Thank you

—
Akhilesh K
Blibli.com

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