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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-5905" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-66cd8ed2-a240-467c-bb64-3b5810062de3" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-5905" style="color: #3b73af; text-decoration: none">HHH-5905</a>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-5905" style="color: #3b73af; text-decoration: none">HQL "where in" queries consume near 100% CPU - possibly for hours</a> </span>
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Change By:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="marcelstoer" id="email_marcelstoer" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=marcelstoer" style="color:#6c797f;; color: #3b73af; text-decoration: none">Marcel Stör</a>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <span class="diffcontext">*Claim*<br />The loop in ParameterParser.parse(String, ParameterParser$Recognizer) uses 100% CPU core per thread that executes it since it iterates over a string char by char and calling string operations in the loop.<br /><br />*Java client*<br />{code:java</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;">)</span> <span class="diffaddedchars" style="background-color:#ddfade;">}<br /></span> <span class="diffcontext">Query query = getEntityManager().createQuery("select articleNumber from Article where articleNumber in (:articleNumbers)");<br />query.setParameter("articleNumbers", articleNumbers);<br />List<ArticleNumber> filteredArticleNumbers = (List<ArticleNumber>) query.getResultList();<br />{code}<br /><br />*Stacktrace of involved classes/methods*<br />{noformat}<br />ParameterParser.parse(String, ParameterParser$Recognizer) line: 88 <br />ParamLocationRecognizer.parseLocations(String) line: 75 <br />HQLQueryPlan.buildParameterMetadata(ParameterTranslations, String) line: 290 <br />HQLQueryPlan.<init>(String, String, boolean, Map, SessionFactoryImplementor) line: 121 <br />HQLQueryPlan.<init>(String, boolean, Map, SessionFactoryImplementor) line: 80 <br />QueryPlanCache.getHQLQueryPlan(String, boolean, Map) line: 98 <br />SessionImpl(AbstractSessionImpl).getHQLQueryPlan(String, boolean) line: 156 <br />SessionImpl.list(String, QueryParameters) line: 1250 <br />QueryImpl.list() line: 102 <br />QueryImpl<X>.getResultList() line: 241<br />{noformat}<br /><br />*Observations*<br />{{QueryImpl#list()}} calls {{SessionImpl#list(String, QueryParameters)}} passing the _expanded_ query:<br />{{return getSession().list(expandParameterLists(namedParams), getQueryParameters(namedParams));}}<br /><br />Hence, what is passed to {{SessionImpl#list(String, QueryParameters)}} in my case is something like:<br /></span> <span class="diffaddedchars" style="background-color:#ddfade;">{noformat}</span> <span class="diffcontext">select articleNumber from Article where articleNumber in (:articleNumbers0_, :articleNumbers1_, :articleNumbers2_, :articleNumbers3_, :articleNumbers4_, :articleNumbers5_, :articleNumbers6_,</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"> <br /></span> <span class="diffaddedchars" style="background-color:#ddfade;"> {noformat}</span> <span class="diffcontext"><br /></span> <span class="diffaddedchars" style="background-color:#ddfade;"><br /></span> <span class="diffcontext">Now imagine how long that query string is when the "where in" query has a few thousand article numbers.</span> <span class="diffaddedchars" style="background-color:#ddfade;"> {{</span> <span class="diffcontext"> org.hibernate.engine.query.ParameterParser.parse(String, Recognizer)</span> <span class="diffaddedchars" style="background-color:#ddfade;">}}</span> <span class="diffcontext"> then iterates over each character in the query string and calls</span> <span class="diffaddedchars" style="background-color:#ddfade;"> {{</span> <span class="diffcontext"> StringHelper.firstIndexOfChar()</span> <span class="diffaddedchars" style="background-color:#ddfade;">}}</span> <span class="diffcontext"> for each named parameter. Even on fast servers this operation may easily take half an hour or more (mind you it's a blocking call!) if the expanded query string has a few million characters.<br />I don't know Hibernate well enough to propose a fix but "where in" with Hibernate is an absolute no-go as it is right now.<br />We had switch all our "where in" queries to native :-(</span>
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