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https://issues.apache.org/jira/browse/SOLR-13195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16757148#comment-16757148
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Johannes Kloos commented on SOLR-13195:
---------------------------------------
Related crashes:
[http://localhost:8983/solr/films/select?distrib=true]
gives the following crash:
{{o.a.s.s.HttpSolrCall null:java.lang.NullPointerException}}
{{ at
org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:362)}}
{{ at
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:199)}}
{{ [...]}}
> NPE caused by distributed queries when no shards are configured
> ---------------------------------------------------------------
>
> Key: SOLR-13195
> URL: https://issues.apache.org/jira/browse/SOLR-13195
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Facet Module
> Affects Versions: master (9.0)
> Environment: h1. Steps to reproduce
> * Use a Linux machine.
> * Build commit {{ea2c8ba}} of Solr as described in the section below.
> * Build the films collection as described below.
> * Start the server using the command {{./bin/solr start -f -p 8983 -s
> /tmp/home}}
> * Request the URL given in the bug description.
> h1. Compiling the server
> {noformat}
> git clone https://github.com/apache/lucene-solr
> cd lucene-solr
> git checkout ea2c8ba
> ant compile
> cd solr
> ant server
> {noformat}
> h1. Building the collection
> We followed [Exercise
> 2|http://lucene.apache.org/solr/guide/7_5/solr-tutorial.html#exercise-2] from
> the [Solr
> Tutorial|http://lucene.apache.org/solr/guide/7_5/solr-tutorial.html]. The
> attached file ({{home.zip}}) gives the contents of folder {{/tmp/home}} that
> you will obtain by following the steps below:
> {noformat}
> mkdir -p /tmp/home
> echo '<?xml version="1.0" encoding="UTF-8" ?><solr></solr>' >
> /tmp/home/solr.xml
> {noformat}
> In one terminal start a Solr instance in foreground:
> {noformat}
> ./bin/solr start -f -p 8983 -s /tmp/home
> {noformat}
> In another terminal, create a collection of movies, with no shards and no
> replication, and initialize it:
> {noformat}
> bin/solr create -c films
> curl -X POST -H 'Content-type:application/json' --data-binary '{"add-field":
> {"name":"name", "type":"text_general", "multiValued":false, "stored":true}}'
> http://localhost:8983/solr/films/schema
> curl -X POST -H 'Content-type:application/json' --data-binary
> '{"add-copy-field" : {"source":"*","dest":"_text_"}}'
> http://localhost:8983/solr/films/schema
> ./bin/post -c films example/films/films.json
> {noformat}
> Reporter: Johannes Kloos
> Priority: Major
>
> Requesting the following URL causes Solr to return an HTTP 500 error response:
> {noformat}
> http://localhost:8983/solr/films/select?distrib=true&facet=on&facet.field=genre
> {noformat}
> The error response seems to be caused by the following uncaught exception:
> {noformat}
> null:java.lang.NullPointerException
> at
> org.apache.solr.handler.component.FacetComponent$DistribFieldFacet.<init>(FacetComponent.java:1432)
> at
> org.apache.solr.handler.component.FacetComponent$FacetInfo.parse(FacetComponent.java:1266)
> at
> org.apache.solr.handler.component.FacetComponent.modifyRequest(FacetComponent.java:528)
> at
> org.apache.solr.handler.component.ResponseBuilder.addRequest(ResponseBuilder.java:162)
> at
> org.apache.solr.handler.component.QueryComponent.createMainQuery(QueryComponent.java:755)
> at
> org.apache.solr.handler.component.QueryComponent.regularDistributedProcess(QueryComponent.java:546)
> at
> org.apache.solr.handler.component.QueryComponent.distributedProcess(QueryComponent.java:499)
> at
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:348)
> {noformat}
> Since the query contains “distrib=true”, it is handled by calling the
> distributedProcess methods of the search pipeline. At no point in the call
> chain that leads to the above exception is there any check if the
> ResponseBuilder rb used to handle the request actually has its shared
> property configured. Nevertheless, the DistribFieldFact constructor tries to
> access rb.shards.length, but rb.shared is null in this example.
> We found this bug using [Diffblue Microservices
> Testing|https://www.diffblue.com/labs/?utm_source=solr-br]. Find more
> information on this [fuzz testing
> campaign|https://www.diffblue.com/blog/2018/12/19/diffblue-microservice-testing-a-sneak-peek-at-our-early-product-and-results?utm_source=solr-br].
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