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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-229] repairDatabase() does not handle infinite chaining loops</title>
                <link>https://jira.mongodb.org/browse/SERVER-229</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If the doubly linked list between objects was in the process of updating when db terminated, you can get an infinite loop of objects when queried - and repair doesn&apos;t handle this.&lt;/p&gt;

&lt;p&gt;Note: it may be better to add durability and get rid of repair than to fix this.&lt;/p&gt;</description>
                <environment></environment>
        <key id="10433">SERVER-229</key>
            <summary>repairDatabase() does not handle infinite chaining loops</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="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="dwight@mongodb.com">Dwight Merriman</reporter>
                        <labels>
                            <label>mmapv1</label>
                    </labels>
                <created>Tue, 11 Aug 2009 10:48:59 +0000</created>
                <updated>Tue, 6 Dec 2022 05:51:30 +0000</updated>
                            <resolved>Fri, 14 Sep 2018 20:26:46 +0000</resolved>
                                                                    <component>MMAPv1</component>
                                        <votes>5</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="624344" author="darkk" created="Tue, 17 Jun 2014 12:29:12 +0000"  >&lt;p&gt;I run mongod in update-heavy installation with disabled journal using mongod as sharded key-value storage with secondary indexes. It is ok to loose some not-so-predictable amount of data in case of server failure, so I assumed that ``mongod --repair`` works and added it in pre-start upstart script. This week one of my servers crashed. Reboot launched repair process that created 50Gb+ temporary files to repair 500 MiB datadir leading to out-of-space condition.&lt;/p&gt;

&lt;p&gt;I can&apos;t suggest good loop detection, but safety belt preventing out-of-space seems to be trivial: stop `mongod --repair` process as soon as temporary files size becomes significantly larger than repaired files size.&lt;/p&gt;

&lt;p&gt;P.S. That was db version v2.4.9&lt;/p&gt;</comment>
                            <comment id="21506" author="eliot" created="Fri, 17 Dec 2010 04:59:56 +0000"  >&lt;p&gt;given durability is going in 1.8, not sure how important this is&lt;/p&gt;</comment>
                            <comment id="13491" author="dwight_10gen" created="Wed, 7 Apr 2010 09:10:10 +0000"  >&lt;p&gt;priority of this ticket could be much lower if server-980 is done&lt;/p&gt;</comment>
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