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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-63047] Make delete batches fully transactional</title>
                <link>https://jira.mongodb.org/browse/SERVER-63047</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A batch involves a single storage transaction on the primary, however it replicates as multiple oplog entries. This behaviour is generally described in&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55909&quot; title=&quot;Prevent a single WUOW from writing multiple oplog entries by default&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55909&quot;&gt;SERVER-55909&lt;/a&gt;. An additional goal for batched deletions is performance, as multiple oplog entries and timestamping introduce overhead.&lt;/p&gt;

&lt;p&gt;Add a mechanism to emit a single oplog entry and timestamp per batch. Explore integration with the internal API for multi-document transactions.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1972461">SERVER-63047</key>
            <summary>Make delete batches fully transactional</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="josef.ahmad@mongodb.com">Josef Ahmad</assignee>
                                    <reporter username="josef.ahmad@mongodb.com">Josef Ahmad</reporter>
                        <labels>
                            <label>PM-2227-M2</label>
                    </labels>
                <created>Thu, 27 Jan 2022 17:20:46 +0000</created>
                <updated>Sun, 29 Oct 2023 21:43:31 +0000</updated>
                            <resolved>Fri, 25 Mar 2022 08:05:15 +0000</resolved>
                                                    <fixVersion>6.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4433320" author="xgen-internal-githook" created="Thu, 24 Mar 2022 18:58:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Josef Ahmad&apos;, &apos;email&apos;: &apos;josef.ahmad@mongodb.com&apos;, &apos;username&apos;: &apos;josefahmad&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63047&quot; title=&quot;Make delete batches fully transactional&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63047&quot;&gt;&lt;del&gt;SERVER-63047&lt;/del&gt;&lt;/a&gt; Make delete batches fully transactional&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/16227df086c840630ded6e4304fd25c04b7fac6b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/16227df086c840630ded6e4304fd25c04b7fac6b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4433319" author="xgen-internal-githook" created="Thu, 24 Mar 2022 18:58:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Josef Ahmad&apos;, &apos;email&apos;: &apos;josef.ahmad@mongodb.com&apos;, &apos;username&apos;: &apos;josefahmad&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63047&quot; title=&quot;Make delete batches fully transactional&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63047&quot;&gt;&lt;del&gt;SERVER-63047&lt;/del&gt;&lt;/a&gt; Make delete batches fully transactional&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/b8199ccfdf2321326b846fd82772b86b75c19418&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/b8199ccfdf2321326b846fd82772b86b75c19418&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4391400" author="josef.ahmad" created="Fri, 4 Mar 2022 14:05:28 +0000"  >&lt;p&gt;I&apos;ve split the first task from the list above into&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64206&quot; title=&quot;Address cyclic dependency between query_exec and transaction libraries &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64206&quot;&gt;&lt;del&gt;SERVER-64206&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="4391052" author="josef.ahmad" created="Fri, 4 Mar 2022 08:04:05 +0000"  >&lt;p&gt;Summary of the main tasks needed to use the internal multi-document transaction API for batching deletes.&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Address a cyclic library dependency between libquery_exec and libtransaction.&lt;br/&gt;
 libtransaction depends on libquery_exec as the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r6.0.0-alpha/src/mongo/db/transaction_history_iterator.cpp&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;transaction history iterator&lt;/a&gt; uses the query executor. Just making the batched delete stage use transactions creates a cyclic dependency: libquery_exec -&amp;gt; libtransaction -&amp;gt; libquery_exec.&lt;/li&gt;
	&lt;li&gt;Address invariants in the MongoDOperationContextSession and TransactionParticipant classes relating to hierarchical lock state. The batched delete stage is likely the first consumer at this lower level in the stack.&lt;/li&gt;
	&lt;li&gt;Mitigate or exempt the batched deleter from the overhead of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62602&quot; title=&quot;Remove unnecessary durable catalog reads for multi-document transactions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62602&quot;&gt;SERVER-62602&lt;/a&gt; which may not be needed for transactions whose entire lifespan is at this low level in the stack.&lt;/li&gt;
&lt;/ul&gt;
</comment>
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            <issuekey id="2001210">SERVER-64506</issuekey>
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            <issuekey id="2308542">SERVER-75759</issuekey>
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