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https://issues.apache.org/jira/browse/SOLR-9330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15515842#comment-15515842
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Mikhail Khludnev commented on SOLR-9330:
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Exception should gone. Sometimes response contains no "search" entry, but only
something like {{Searcher@deadbeaf [collection1] main}}. So, patterns consuming
stats response might, but shouldn't be surprised.
> Race condition between core reload and statistics request
> ---------------------------------------------------------
>
> Key: SOLR-9330
> URL: https://issues.apache.org/jira/browse/SOLR-9330
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 5.5
> Reporter: Andrey Kudryavtsev
> Assignee: Mikhail Khludnev
> Fix For: 6.3, master (7.0)
>
> Attachments: SOLR-9330.patch, SOLR-9390.patch, SOLR-9390.patch,
> SOLR-9390.patch, SOLR-9390.patch, too_sync.patch
>
>
> Things happened that we execute this two requests consecutively in Solr 5.5:
> * Core reload: /admin/cores?action=RELOAD&core=_coreName_
> * Check core statistics: /_coreName_/admin/mbeans?stats=true
> And sometimes second request ends with this error:
> {code}
> ERROR org.apache.solr.servlet.HttpSolrCall -
> null:org.apache.lucene.store.AlreadyClosedException: this IndexReader is
> closed
> at org.apache.lucene.index.IndexReader.ensureOpen(IndexReader.java:274)
> at
> org.apache.lucene.index.StandardDirectoryReader.getVersion(StandardDirectoryReader.java:331)
> at
> org.apache.lucene.index.FilterDirectoryReader.getVersion(FilterDirectoryReader.java:119)
> at
> org.apache.lucene.index.FilterDirectoryReader.getVersion(FilterDirectoryReader.java:119)
> at
> org.apache.solr.search.SolrIndexSearcher.getStatistics(SolrIndexSearcher.java:2404)
> at
> org.apache.solr.handler.admin.SolrInfoMBeanHandler.addMBean(SolrInfoMBeanHandler.java:164)
> at
> org.apache.solr.handler.admin.SolrInfoMBeanHandler.getMBeanInfo(SolrInfoMBeanHandler.java:134)
> at
> org.apache.solr.handler.admin.SolrInfoMBeanHandler.handleRequestBody(SolrInfoMBeanHandler.java:65)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:155)
> at org.apache.solr.core.SolrCore.execute(SolrCore.java:2082)
> at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:670)
> at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:458)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:225)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:183)
> {code}
> If my understanding of SolrCore internals is correct, it happens because of
> async nature of reload request:
> * New searcher is "registered" in separate thread
> * Old searcher is closed in same separate thread and only after new one is
> registered
> * When old searcher is closing, it removes itself from map with MBeans
> * If statistic requests happens before old searcher is completely removed
> from everywhere - exception can happen.
> What do you think if we will introduce new parameter for reload request which
> makes it fully synchronized? Basically it will force it to call {code}
> SolrCore#getSearcher(boolean forceNew, boolean returnSearcher, final Future[]
> waitSearcher, boolean updateHandlerReopens) {code} with waitSearcher!= null
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