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From "Mikhail Khludnev (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SOLR-9330) Race condition between core reload and statistics request
Date Fri, 23 Sep 2016 08:54:20 GMT

     [ https://issues.apache.org/jira/browse/SOLR-9330?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mikhail Khludnev resolved SOLR-9330.
------------------------------------
    Resolution: Fixed

> 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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