Details
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Bug
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Status: Patch Available
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Major
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Resolution: Unresolved
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8.2
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None
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None
Description
When performing a distributed search with multiple shards having elevation configured where one ore more shards do have elevated results but others do not a NullPointerException is thrown.
We are using Solr 8.2 and have the QueryElevationComponent configured with "last-components" of the default search handler "/select". But the problem also occurs when using the explicit "/elevate" search handler.
<requestHandler name="/select" class="solr.SearchHandler"> ... <arr name="last-components"> <str>elevator</str> </arr> </requestHandler> ... <searchComponent name="elevator" class="solr.QueryElevationComponent" > <!-- pick a fieldType to analyze queries --> <str name="queryFieldType">string</str> <str name="config-file">elevate.xml</str> </searchComponent>
Steps to reproduce:
(1) Add entries to the elevate.xml of each core to elevate a specific document for the text "elevatedTerm
core1: <elevate> ... <query text="elevatedTerm"><doc id="core1docId1" /></query> </elevate> core2: <elevate> ... <query text="elevatedTerm"><doc id="core2docId1" /></query> </elevate>
(2) Execute query (we use port 9983)
http://localhost:9983/solr/core1/select?q=elevatedTerm&lowercaseOperators=false&df=text_en&defType=edismax&fq=lang:en&shards=localhost:9983/solr/core1,localhost:9983/solr/core2&fl=[elevated],[shard],area,id&rows=10&start=0
As both shards have elevated documents for the requested "elevatedTerm" the search results are as expected:
response: { numFound: 5192, start: 0, maxScore: 1.9032197, docs: [{ area: "press", id: "core1docId1", [elevated]: true, [shard]: "localhost:9983/solr/core1" }, { area: "products", id: "core2docId1", [elevated]: true, [shard]: "localhost:9983/solr/core2" }, { area: "press", id: "core1docId2", [elevated]: false, [shard]: "localhost:9983/solr/core1" }, ...
(3) Remove the elevation entry for that "elevatedTerm" from one of the cores, e.g. via comment
core2: <elevate> ... <!-- <query text="elevatedTerm"><doc id="core2docId1" /></query> --> </elevate>
(4) Reload the modified core: http://localhost:9983/solr/admin/cores?action=RELOAD&core=core2
(5) Request same query again and you get the NPE:
error: { trace: "java.lang.NullPointerException at org.apache.solr.handler.component.QueryComponent.unmarshalSortValues(QueryComponent.java:1068) at org.apache.solr.handler.component.QueryComponent.mergeIds(QueryComponent.java:917) at org.apache.solr.handler.component.QueryComponent.handleRegularResponses(QueryComponent.java:613) at org.apache.solr.handler.component.QueryComponent.handleResponses(QueryComponent.java:592) at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:431) at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:199) at org.apache.solr.core.SolrCore.execute(SolrCore.java:2578) at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:780) at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:566) at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:423) at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:350) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1602) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:540) ...
When adding the sort parameter with forceElevation=true to the query then a ClassCastException is thrown
http://localhost:9983/solr/core1/select?q=elevatedTerm&lowercaseOperators=false&df=text_en&defType=edismax&fq=lang:en&shards=localhost:9983/solr/core1,localhost:9983/solr/core2&fl=[elevated],[shard],area,id&rows=10&start=0&sort=area%20asc&forceElevation=true
java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String at org.apache.solr.schema.FieldType.unmarshalStringSortValue(FieldType.java:1229) at org.apache.solr.schema.StrField.unmarshalSortValue(StrField.java:122) at org.apache.solr.handler.component.QueryComponent.unmarshalSortValues(QueryComponent.java:1092) at org.apache.solr.handler.component.QueryComponent.mergeIds(QueryComponent.java:917) at org.apache.solr.handler.component.QueryComponent.handleRegularResponses(QueryComponent.java:613) at org.apache.solr.handler.component.QueryComponent.handleResponses(QueryComponent.java:592) at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:431) at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:199) at org.apache.solr.core.SolrCore.execute(SolrCore.java:2578) at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:780) ...