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    <title>MongoDB Jira</title>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-526] Unknown Server Crash, maybe related to deletes</title>
                <link>https://jira.mongodb.org/browse/SERVER-526</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I brought up a question in the forums and mentioned a server crash.  &lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://groups.google.com/group/mongodb-user/browse_thread/thread/d651ded2208dc87e/e22901c257054231#e22901c257054231&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://groups.google.com/group/mongodb-user/browse_thread/thread/d651ded2208dc87e/e22901c257054231#e22901c257054231&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;In that thread I said that adding indexes fixed the crash.  We&apos;ll, ... it didn&apos;t.  During testing on our dev server I got the crash today.  I think what&apos;s new here is the 1.2.1 background delete functionality.  I&apos;m also seeing &quot;key seems to have moved in the index, refinding. found:1&quot; quite a bit.&lt;/p&gt;

&lt;p&gt;I was running 2 applications.&lt;/p&gt;

&lt;p&gt;I was running only one processes of type &quot;app1&quot;.  This is a very fast app that hits mongo very hard.&lt;/p&gt;

&lt;p&gt;1. background thread requested delete on old records&lt;br/&gt;
2. background thread was several different ordered queries, then rewriting some of the records&lt;br/&gt;
3. foreground thread was querying and inserting records&lt;/p&gt;

&lt;p&gt;I was running 10 processes of type &quot;app2&quot;&lt;/p&gt;

&lt;p&gt;4. slowly gets various data, queries mongo, and reads and writes a fairly large record&lt;/p&gt;</description>
                <environment></environment>
        <key id="11098">SERVER-526</key>
            <summary>Unknown Server Crash, maybe related to deletes</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="9">Done</resolution>
                                        <assignee username="eliot">Eliot Horowitz</assignee>
                                    <reporter username="douggreen">Doug Green</reporter>
                        <labels>
                    </labels>
                <created>Sat, 9 Jan 2010 19:42:00 +0000</created>
                <updated>Tue, 12 Jul 2016 00:30:20 +0000</updated>
                            <resolved>Sat, 9 Jan 2010 20:23:02 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="11681" author="eliot" created="Sat, 9 Jan 2010 20:23:02 +0000"  >&lt;p&gt;See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-527&quot; title=&quot;running out of threads causes db to crash&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-527&quot;&gt;&lt;del&gt;SERVER-527&lt;/del&gt;&lt;/a&gt; for root casue.&lt;br/&gt;
Background delets aren&apos;t in 1.2.1 but 1.3.0&lt;br/&gt;
I think the problem is that they are blocking and then connections are backing up.&lt;/p&gt;

&lt;p&gt;One weird thing is why are 37 connections not allowed, that&apos;s something weird with your setup i think.&lt;/p&gt;

&lt;p&gt;But this fix will cause db not to crash.&lt;/p&gt;</comment>
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