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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-44748] Do not suppress WriteConflictExceptions in debug builds when checking IndexCatalog::numIndexesTotal</title>
                <link>https://jira.mongodb.org/browse/SERVER-44748</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &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;, we started suppressing &lt;a href=&quot;https://github.com/mongodb/mongo/blob/850610cc4aebe78246a964b02a84020f82737669/src/mongo/db/catalog/index_catalog_impl.cpp#L990-L999&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;WriteConflicts in debug builds when calling numIndexesTotal(), which reads from the durable catalog&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Unfortunately it is not correct to ignore WriteConflicts. The storage engine may choose to abort a transaction at any time, often due to cache pressure. When the storage engine does abort an operation, it throws a WriteConflictException. If an operation ignores this error, it will continue to commit the operation instead. This will lead to the following error from WiredTiger:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;WiredTiger error (22) [1573582080:566402][25006:0x7f3c19192700], WT_SESSION.commit_transaction: __session_commit_transaction, 1649: failed transaction requires rollback: oldest transaction ID rolled back for eviction&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;We should solve the original problem described in &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; in a different way. This may involve reverting the original code.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1016116">SERVER-44748</key>
            <summary>Do not suppress WriteConflictExceptions in debug builds when checking IndexCatalog::numIndexesTotal</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="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                            <label>groomed</label>
                    </labels>
                <created>Wed, 20 Nov 2019 19:44:47 +0000</created>
                <updated>Sun, 29 Oct 2023 22:14:45 +0000</updated>
                            <resolved>Tue, 7 Jan 2020 17:18:39 +0000</resolved>
                                                    <fixVersion>4.3.3</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2710012" author="xgen-internal-githook" created="Tue, 7 Jan 2020 17:17:58 +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; do not ignore write conflict exceptions for write transactions&lt;/p&gt;

&lt;p&gt;In debug mode, we check that the catalog is consistent when fetching the total number of indexes.  This check might encounter a WT_ROLLBACK, so suppress such WCE&apos;s.  We can only safely do this for read transactions, since such transactions cannot be subsequently committed, due to the rollback error.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7543397e4fd0ecc16572bea381174265e38d15c2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7543397e4fd0ecc16572bea381174265e38d15c2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2678970" author="xgen-internal-githook" created="Fri, 27 Dec 2019 18:24:54 +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="2678878" author="milkie" created="Fri, 27 Dec 2019 17:18:48 +0000"  >&lt;p&gt;I am considering two options:&lt;br/&gt;
1. Look at the currently held lock and suppress the WCE for S-locks but not for X-locks.  This is making an assumption that any transactions with S or IS locks will end with a call to rollback_transaction.&lt;br/&gt;
2. Handle WCE&apos;s in read transactions, at a higher level.&lt;/p&gt;</comment>
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