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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-42123] dassert in IndexCatalogImpl::numIndexesTotal() can throw a WriteConflictException in debug builds</title>
                <link>https://jira.mongodb.org/browse/SERVER-42123</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The dassert tries to read a record out of the catalog using &lt;tt&gt;KVCollectionCatalogEntry::getMetadata()&lt;/tt&gt; which uses &lt;tt&gt;WiredTigerRecordStore::findRecord()&lt;/tt&gt; and that could return a &lt;tt&gt;WriteConflictException&lt;/tt&gt; when the &lt;tt&gt;WTSkipPrepareConflictRetries&lt;/tt&gt; and &lt;tt&gt;skipWriteConflictRetries&lt;/tt&gt; failpoints are enabled, preventing the &lt;tt&gt;WiredTigerRecordStore::findRecord()&lt;/tt&gt; from retrying. Eventually this bubbles up to the caller as a &lt;tt&gt;WriteConflict&lt;/tt&gt;. The dassert is a sanity check in debug builds to ensure that the in-memory index catalog matches the one on-disk. &lt;/p&gt;

&lt;p&gt;Running a command that doesn&apos;t expect a &lt;tt&gt;WriteConflictException&lt;/tt&gt; such as the &lt;tt&gt;collStats&lt;/tt&gt; command can return a &lt;tt&gt;WriteConflict&lt;/tt&gt; error back to the user in this case.&lt;/p&gt;</description>
                <environment></environment>
        <key id="840840">SERVER-42123</key>
            <summary>dassert in IndexCatalogImpl::numIndexesTotal() can throw a WriteConflictException in debug builds</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="13201">Fixed</resolution>
                                        <assignee username="gregory.wlodarek@mongodb.com">Gregory Wlodarek</assignee>
                                    <reporter username="gregory.wlodarek@mongodb.com">Gregory Wlodarek</reporter>
                        <labels>
                    </labels>
                <created>Tue, 9 Jul 2019 14:35:09 +0000</created>
                <updated>Sun, 29 Oct 2023 22:19:14 +0000</updated>
                            <resolved>Wed, 24 Jul 2019 16:25:42 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Index Maintenance</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2678971" author="xgen-internal-githook" created="Fri, 27 Dec 2019 18:24:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Eric Milkie&apos;, &apos;email&apos;: &apos;milkie@mongodb.com&apos;, &apos;username&apos;: &apos;milkie&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44748&quot; title=&quot;Do not suppress WriteConflictExceptions in debug builds when checking IndexCatalog::numIndexesTotal&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44748&quot;&gt;&lt;del&gt;SERVER-44748&lt;/del&gt;&lt;/a&gt; Revert &apos;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42123&quot; title=&quot;dassert in IndexCatalogImpl::numIndexesTotal() can throw a WriteConflictException in debug builds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42123&quot;&gt;&lt;del&gt;SERVER-42123&lt;/del&gt;&lt;/a&gt; Skip dassert check in IndexCatalogImpl::numIndexesTotal() if it throws a WriteConflictException in debug builds&apos;&lt;/p&gt;

&lt;p&gt;This reverts commit 458defe182cdd3fc6abedc53c6109b54d9192539.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/901e85b067316fa7b967fe00bdef4cf501a1e4e9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/901e85b067316fa7b967fe00bdef4cf501a1e4e9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2341862" author="xgen-internal-githook" created="Wed, 24 Jul 2019 16:25:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;username&apos;: &apos;GWlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42123&quot; title=&quot;dassert in IndexCatalogImpl::numIndexesTotal() can throw a WriteConflictException in debug builds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42123&quot;&gt;&lt;del&gt;SERVER-42123&lt;/del&gt;&lt;/a&gt; Skip dassert check in IndexCatalogImpl::numIndexesTotal() if it throws a WriteConflictException in debug builds&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/458defe182cdd3fc6abedc53c6109b54d9192539&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/458defe182cdd3fc6abedc53c6109b54d9192539&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2317199" author="gregory.wlodarek" created="Tue, 9 Jul 2019 15:23:57 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=max.hirschhorn&quot; class=&quot;user-hover&quot; rel=&quot;max.hirschhorn&quot;&gt;max.hirschhorn&lt;/a&gt; correct. Unfortunately getting the collection options to determine whether the collection is capped or not will do a read from disk today.&lt;/p&gt;

&lt;p&gt;Perhaps we can check whether the collection is capped or not prior to enabling the failpoints in the fuzzer code?&lt;/p&gt;</comment>
                            <comment id="2316915" author="max.hirschhorn@10gen.com" created="Tue, 9 Jul 2019 14:45:56 +0000"  >&lt;p&gt;Do I understand correctly that the &lt;tt&gt;dassert()&lt;/tt&gt; is causing the &lt;tt&gt;collStats&lt;/tt&gt; command to trigger a prepare conflict for which the combination of the &lt;tt&gt;WTSkipPrepareConflictRetries&lt;/tt&gt; and &lt;tt&gt;skipWriteConflictRetries&lt;/tt&gt; failpoints is causing to manifest as a &lt;tt&gt;WriteConflict&lt;/tt&gt; that gets returned back to the user?&lt;/p&gt;

&lt;p&gt;The goal of the rollback fuzzer running the &lt;tt&gt;collStats&lt;/tt&gt; command is to determine whether the collection is capped or not. This is because we don&apos;t want to run the &lt;tt&gt;prepareTransaction&lt;/tt&gt; command on a transaction started on a capped collection. If there&apos;s another way to glean the same information, then changing the rollback fuzzer and leaving the server&apos;s behavior alone is another option.&lt;/p&gt;</comment>
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