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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-4569] Mongo seems to fail assert on benign queries</title>
                <link>https://jira.mongodb.org/browse/SERVER-4569</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This gets written to the mongos log (and generates an exception in pymongo) on queries that look benign:&lt;/p&gt;

&lt;p&gt;Wed Dec 28 09:39:15 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn236&amp;#93;&lt;/span&gt;   Assertion failure shards.size() s/commands_public.cpp 453&lt;br/&gt;
0x52b776 0x53662b 0x79a1f8 0x793175 0x76cf2b 0x7b4927 0x7c6cf1 0x5e6a07 0x3dbc80673d 0x3dbbcd44bd &lt;br/&gt;
 mongos(_ZN5mongo12sayDbContextEPKc+0x96) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x52b776&amp;#93;&lt;/span&gt;&lt;br/&gt;
 mongos(_ZN5mongo8assertedEPKcS1_j+0xfb) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x53662b&amp;#93;&lt;/span&gt;&lt;br/&gt;
 mongos(_ZN5mongo15dbgrid_pub_cmds8CountCmd3runERKSsRNS_7BSONObjEiRSsRNS_14BSONObjBuilderEb+0x2108) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x79a1f8&amp;#93;&lt;/span&gt;&lt;br/&gt;
 mongos(_ZN5mongo7Command20runAgainstRegisteredEPKcRNS_7BSONObjERNS_14BSONObjBuilderEi+0x8b5) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x793175&amp;#93;&lt;/span&gt;&lt;br/&gt;
 mongos(_ZN5mongo14SingleStrategy7queryOpERNS_7RequestE+0x5cb) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x76cf2b&amp;#93;&lt;/span&gt;&lt;br/&gt;
 mongos(_ZN5mongo7Request7processEi+0x187) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x7b4927&amp;#93;&lt;/span&gt;&lt;br/&gt;
 mongos(_ZN5mongo21ShardedMessageHandler7processERNS_7MessageEPNS_21AbstractMessagingPortEPNS_9LastErrorE+0x71) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x7c6cf1&amp;#93;&lt;/span&gt;&lt;br/&gt;
 mongos(_ZN5mongo3pms9threadRunEPNS_13MessagingPortE+0x287) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x5e6a07&amp;#93;&lt;/span&gt;&lt;br/&gt;
 /lib64/libpthread.so.0 &lt;span class=&quot;error&quot;&gt;&amp;#91;0x3dbc80673d&amp;#93;&lt;/span&gt;&lt;br/&gt;
 /lib64/libc.so.6(clone+0x6d) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x3dbbcd44bd&amp;#93;&lt;/span&gt;&lt;/p&gt;</description>
                <environment>CentOS, Mongo 2.0.2</environment>
        <key id="27349">SERVER-4569</key>
            <summary>Mongo seems to fail assert on benign queries</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="aaron">Aaron Staple</assignee>
                                    <reporter username="tjohnson@allstontrading.com">Thomas Johnson</reporter>
                        <labels>
                            <label>mongos</label>
                    </labels>
                <created>Wed, 28 Dec 2011 15:42:01 +0000</created>
                <updated>Wed, 29 Feb 2012 03:53:42 +0000</updated>
                            <resolved>Mon, 13 Feb 2012 01:33:06 +0000</resolved>
                                    <version>2.0.2</version>
                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="87728" author="aaron" created="Mon, 13 Feb 2012 01:33:27 +0000"  >&lt;p&gt;Yep - it&apos;s &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4554&quot; title=&quot;shard selection code asserts for certain unsatisfiable queries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4554&quot;&gt;&lt;del&gt;SERVER-4554&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="76534" author="eliot" created="Thu, 29 Dec 2011 13:20:00 +0000"  >&lt;p&gt;It shouldn&apos;t assert - that&apos;s a bug that I think is already fixed in master.&lt;/p&gt;</comment>
                            <comment id="76532" author="tjohnson@allstontrading.com" created="Thu, 29 Dec 2011 13:17:25 +0000"  >&lt;p&gt;It&apos;s definitely possible that the query has no results. But why should something that is such a normal part of operations cause an assertion failure and an exception in the client?&lt;/p&gt;</comment>
                            <comment id="76490" author="eliot" created="Thu, 29 Dec 2011 07:08:09 +0000"  >&lt;p&gt;is it possible this query has no possible results?&lt;br/&gt;
There is an issue if you do a query like&lt;br/&gt;
{ a : &lt;/p&gt;
{ $gt : 5 , $lt : 3 }
&lt;p&gt; }&lt;br/&gt;
that can&apos;t have results&lt;/p&gt;</comment>
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