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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-34443] Refactor how WiredTigerRecoveryUnit and WiredTigerSnapshotManager begin transactions at points in time</title>
                <link>https://jira.mongodb.org/browse/SERVER-34443</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There are &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/storage/wiredtiger/wiredtiger_recovery_unit.h#L151-L169&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;4 different Timestamp member variables&lt;/a&gt; and equally as many booleans to track how we open transactions, timestamp transactions, and commit transactions. The relationship between the recovery unit and the snapshot manager is equally as confusing. &lt;/p&gt;

&lt;p&gt;There are 5 ways to open a transaction and 2 ways to commit.&lt;/p&gt;

&lt;p&gt;On top of that, the &lt;tt&gt;ignore_prepare&lt;/tt&gt; flag has to be set in each of the 5 places we begin transactions, and sometimes with additional configuration parameters.&lt;/p&gt;

&lt;p&gt;My suggestions for improvement (at a minimum) are:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Only call begin_transaction in one place, potentially as a helper on the WiredTigerSession or the RecoveryUnit itself.&lt;/li&gt;
	&lt;li&gt;Use an enum to keep track of what type of read/commit we are doing for the open transaction.&lt;/li&gt;
	&lt;li&gt;To reduce timestamp confusion we should only have to keep track of 2 timestamps: when to read and when to commit.&lt;/li&gt;
	&lt;li&gt;The SnapshotManager should only keep track of timestamps (or removed completely), and not be the designated caller to open special types of transactions.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="526194">SERVER-34443</key>
            <summary>Refactor how WiredTigerRecoveryUnit and WiredTigerSnapshotManager begin transactions at points in time</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="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Thu, 12 Apr 2018 19:25:56 +0000</created>
                <updated>Sun, 29 Oct 2023 22:32:46 +0000</updated>
                            <resolved>Tue, 15 May 2018 18:10:15 +0000</resolved>
                                                    <fixVersion>4.0.0</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1891933" author="xgen-internal-githook" created="Tue, 15 May 2018 17:38:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;, &apos;name&apos;: &apos;Louis Williams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34443&quot; title=&quot;Refactor how WiredTigerRecoveryUnit and WiredTigerSnapshotManager begin transactions at points in time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34443&quot;&gt;&lt;del&gt;SERVER-34443&lt;/del&gt;&lt;/a&gt; Refactor WiredTigerRecoveryUnit and WiredTigerSnapshotManager. An enum is now used to indicate at which time to read on a RecoveryUnit.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6d2de545a7cfcf4ab23dcf73426a1d50896d6d0c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6d2de545a7cfcf4ab23dcf73426a1d50896d6d0c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1884846" author="geert.bosch" created="Mon, 7 May 2018 17:06:46 +0000"  >&lt;p&gt;Taking out of epic, as this is not required by the scope or design.&lt;/p&gt;</comment>
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            <issuekey id="508960">SERVER-33794</issuekey>
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