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    <title>MongoDB Jira</title>
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    <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-23326] applyOps should use a single WriteUnitOfWork where possible</title>
                <link>https://jira.mongodb.org/browse/SERVER-23326</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently we break some guarantees of atomicity by using separate WUOWs for each op and for the final logOp. This can result in a server performing the modification but not adding it to its oplog if the server is shut down in the middle of an applyOps.&lt;/p&gt;

&lt;p&gt;We can&apos;t use a single WUOW in the general case because applyOps needs to support operations like building an index that are illegal inside of a WUOW. However, it should be possible to detect if all ops are simple single-document CRUD ops and use a single WUOW in that case. This would cover all uses of applyOps that are used when writing to the config servers.&lt;/p&gt;</description>
                <environment></environment>
        <key id="274690">SERVER-23326</key>
            <summary>applyOps should use a single WriteUnitOfWork where possible</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="1" iconUrl="https://jira.mongodb.org/images/icons/priorities/blocker.svg">Blocker - P1</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="geert.bosch@mongodb.com">Geert Bosch</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                            <label>RF</label>
                            <label>bkp</label>
                    </labels>
                <created>Wed, 23 Mar 2016 22:20:35 +0000</created>
                <updated>Sun, 8 Oct 2017 00:28:41 +0000</updated>
                            <resolved>Sat, 4 Jun 2016 02:57:12 +0000</resolved>
                                                    <fixVersion>3.3.8</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>18</watches>
                                                                                                                <comments>
                            <comment id="1462330" author="geert.bosch" created="Tue, 20 Dec 2016 17:51:28 +0000"  >&lt;p&gt;Given that backup relies on &lt;tt&gt;applyOps&lt;/tt&gt; being non-atomic, this change would break OpsManager. It is too big of a change to backport in a general fashion, IMO. We could consider doing this only for config servers, or similar.&lt;/p&gt;</comment>
                            <comment id="1284212" author="xgen-internal-githook" created="Sat, 4 Jun 2016 02:53:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;GeertBosch&apos;, u&apos;name&apos;: u&apos;Geert Bosch&apos;, u&apos;email&apos;: u&apos;geert@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23326&quot; title=&quot;applyOps should use a single WriteUnitOfWork where possible&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23326&quot;&gt;&lt;del&gt;SERVER-23326&lt;/del&gt;&lt;/a&gt; Commit applyOps as single WUOW where possible&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e533634d86aae9385d9bdd94e15d992c4c8de622&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e533634d86aae9385d9bdd94e15d992c4c8de622&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1217204" author="martin.bligh" created="Mon, 28 Mar 2016 20:48:05 +0000"  >&lt;p&gt;If we want to make this more consistent, it&apos;d seem to make sense to make a hard rule (controlled by a bool flag) - ie we either do it in one WUOW or fail the command if we can&apos;t do that?&lt;/p&gt;</comment>
                            <comment id="1213392" author="scotthernandez" created="Thu, 24 Mar 2016 02:41:43 +0000"  >&lt;p&gt;We have a mechanism in replication to address this as we store the batch boundaries (in the minvalid document), which indicates the operations being applied in the batch. Is there some reason this is not sufficient?&lt;/p&gt;

&lt;p&gt;Or are you really suggesting some optimization for the applyOps command (which is used by sharding), not replication related?&lt;/p&gt;</comment>
                            <comment id="1213220" author="redbeard0531" created="Wed, 23 Mar 2016 22:21:50 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=geert.bosch&quot; class=&quot;user-hover&quot; rel=&quot;geert.bosch&quot;&gt;geert.bosch&lt;/a&gt; I put this on the sharding backlog for prioritization since that is the main use case that will benefit, but this will probably end up being implemented by the Integration team.&lt;/p&gt;</comment>
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            <issuekey id="401538">SERVER-30049</issuekey>
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            <issuekey id="238359">SERVER-21345</issuekey>
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            <issuelink>
            <issuekey id="397153">SERVER-29802</issuekey>
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            <issuekey id="224170">SERVER-19768</issuekey>
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            <issuekey id="335450">SERVER-27246</issuekey>
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