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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>
    </build-info>


<item>
            <title>[SERVER-35798] Writing an oplog entry for prepare should not push the lastApplied timestamp</title>
                <link>https://jira.mongodb.org/browse/SERVER-35798</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Our current prepareTransaction() logic might need some changes: currently, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/70255f060ec9aacdb990a5e37a55c8c7b272c8b8/src/mongo/db/session.cpp#L850&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;(1)&#160;&lt;/a&gt;we first log the prepare and get a timestamp T. And then &lt;a href=&quot;https://github.com/mongodb/mongo/blob/70255f060ec9aacdb990a5e37a55c8c7b272c8b8/src/mongo/db/session.cpp#L855&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;(2)&lt;/a&gt; use this timestamp T to set the prepare timestamp in WiredTiger. Since (1) pushes the lastApplied&#160;timestamp to T and another transaction could start between (1) and (2), with lastApplied&#160;T as the read timestamp, it breaks the rule that prepare timestamp should be greater than any active read timestamp.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Here is what happened in BF-9432:&lt;br/&gt;
1. A started a transaction, did the insertion, and tried to prepare.&lt;br/&gt;
2. A called &lt;a href=&quot;https://github.com/mongodb/mongo/blob/70255f060ec9aacdb990a5e37a55c8c7b272c8b8/src/mongo/db/session.cpp#L850-L855&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;prepareTransaction()&lt;/a&gt; in session.cpp. It first &lt;a href=&quot;https://github.com/mongodb/mongo/blob/70255f060ec9aacdb990a5e37a55c8c7b272c8b8/src/mongo/db/session.cpp#L850&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;logged the prepare and got a timestamp T&lt;/a&gt;. &lt;font color=&quot;#ff0000&quot;&gt;This operation also pushed the lastApplied timestamp to T.&lt;/font&gt;&lt;br/&gt;
3. B started a transaction with a read, the read timestamp is set to the lastApplied which is T.&lt;br/&gt;
4. A now &lt;a href=&quot;https://github.com/mongodb/mongo/blob/70255f060ec9aacdb990a5e37a55c8c7b272c8b8/src/mongo/db/session.cpp#L855&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;tried to set the prepare timestamp to T in WiredTiger&lt;/a&gt;. It will cause a WiredTiger error that prepare timestamp being equal to an active read timestamp.&lt;/p&gt;</description>
                <environment></environment>
        <key id="564018">SERVER-35798</key>
            <summary>Writing an oplog entry for prepare should not push the lastApplied timestamp</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="judah.schvimer@mongodb.com">Judah Schvimer</assignee>
                                    <reporter username="xiangyu.yao@mongodb.com">Xiangyu Yao</reporter>
                        <labels>
                            <label>prepare_basic</label>
                    </labels>
                <created>Mon, 25 Jun 2018 22:33:41 +0000</created>
                <updated>Sun, 29 Oct 2023 22:30:25 +0000</updated>
                            <resolved>Tue, 7 Aug 2018 17:59:21 +0000</resolved>
                                                    <fixVersion>4.1.2</fixVersion>
                                    <component>Replication</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="1969437" author="xgen-internal-githook" created="Tue, 7 Aug 2018 17:58:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;judahschvimer&apos;, &apos;name&apos;: &apos;Judah Schvimer&apos;, &apos;email&apos;: &apos;judah@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35798&quot; title=&quot;Writing an oplog entry for prepare should not push the lastApplied timestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35798&quot;&gt;&lt;del&gt;SERVER-35798&lt;/del&gt;&lt;/a&gt; preallocate prepare timestamp&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0ed9472dc8c2f85e957052f01336b1247c7a6e75&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0ed9472dc8c2f85e957052f01336b1247c7a6e75&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1962965" author="ian@10gen.com" created="Wed, 1 Aug 2018 15:51:37 +0000"  >&lt;p&gt;since it doesn&apos;t send an email when a link is added, just a heads up that this bug is blocking us from finishing &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36023&quot; title=&quot;Try to enable replica set transaction testing with the inMemory WT storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36023&quot;&gt;&lt;del&gt;SERVER-36023&lt;/del&gt;&lt;/a&gt;, a part of the work to enable recoverable rollback for the inmem storage engine.&lt;/p&gt;</comment>
                            <comment id="1939841" author="judah.schvimer" created="Thu, 5 Jul 2018 19:07:13 +0000"  >&lt;p&gt;I talked to &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; again and we came to the conclusion that Replication should choose a &lt;tt&gt;prepareTimetamp&lt;/tt&gt;, then prepare the transaction, and then write the prepare oplog entry. This means that once the transaction writes the oplog entry it can only be aborted by the coordinator, since nothing after that point can fail before we return success to the user. &lt;/p&gt;

&lt;p&gt;There is a period of time when a read can come in after we choose the &lt;tt&gt;prepareTimestamp&lt;/tt&gt; but before we&apos;ve prepared the transaction. This will now be safe though, because any read that cares, which is any with &lt;tt&gt;readConcern: snapshot&lt;/tt&gt; or &lt;tt&gt;readConcern: *,  afterClusterTime: &amp;gt; prepareTimestamp&lt;/tt&gt; will call &lt;tt&gt;waitForAllEarlierOplogWritesToBeVisible&lt;/tt&gt; as of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35821&quot; title=&quot;readConcern:snapshot transactions need a read timestamp &amp;lt;= WT&amp;#39;s all_committed point&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35821&quot;&gt;&lt;del&gt;SERVER-35821&lt;/del&gt;&lt;/a&gt;, which would wait for the prepare oplog entry to be visible before trying to do the read, and at that point the transaction will already be prepared.&lt;/p&gt;

&lt;p&gt;As such, I propose this ticket&apos;s work item to be to put the transaction into prepare before writing the prepare oplog entry.&lt;/p&gt;</comment>
                            <comment id="1935300" author="schwerin" created="Fri, 29 Jun 2018 19:51:13 +0000"  >&lt;p&gt;I believe I agree. Reads at &quot;local&quot; read concern don&apos;t offer any guarantees that require blocking when accessing documents in the &quot;prepared&quot; state. They can safely read what Judah refers to as the pre-image.&lt;/p&gt;</comment>
                            <comment id="1934812" author="judah.schvimer" created="Fri, 29 Jun 2018 14:22:56 +0000"  >&lt;p&gt;It is unclear to me why local reads ever block on prepared transactions given the above reasoning. To be consistent, I would expect them to have the same behavior as &quot;available&quot; reads and see the pre-image.&lt;/p&gt;</comment>
                            <comment id="1934382" author="spencer" created="Thu, 28 Jun 2018 22:02:47 +0000"  >&lt;p&gt;We should consider whether the current behavior of local RC reads to potentially read a newer value and then an older one (by reading an operation that has committed, but where there are still uncommitted writes with early commit times in flight) is actually behavior as designed or is actually a bug.&lt;/p&gt;

&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=schwerin&quot; class=&quot;user-hover&quot; rel=&quot;schwerin&quot;&gt;schwerin&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1932233" author="judah.schvimer" created="Tue, 26 Jun 2018 19:22:57 +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; pointed out that this isn&apos;t actually a problem for normal reads. Local reads not at a timestamp already sometimes read behind committed transactions, and reading behind prepared transactions is not a problem. This is only a problem for reads at a timestamp. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35821&quot; title=&quot;readConcern:snapshot transactions need a read timestamp &amp;lt;= WT&amp;#39;s all_committed point&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35821&quot;&gt;&lt;del&gt;SERVER-35821&lt;/del&gt;&lt;/a&gt; should fix this.&lt;/p&gt;</comment>
                            <comment id="1932136" author="louis.williams" created="Tue, 26 Jun 2018 19:02:39 +0000"  >&lt;p&gt;I think that may be doable.&#160;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=keith.bostic&quot; class=&quot;user-hover&quot; rel=&quot;keith.bostic&quot;&gt;keith.bostic&lt;/a&gt;&#160;is there anything I may not be considering here?&lt;/p&gt;</comment>
                            <comment id="1932106" author="judah.schvimer" created="Tue, 26 Jun 2018 18:39:17 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=louis.williams&quot; class=&quot;user-hover&quot; rel=&quot;louis.williams&quot;&gt;louis.williams&lt;/a&gt;, the ideal behavior would be to allow that behavior for &lt;tt&gt;prepare_transaction&lt;/tt&gt; and shortly after set the &lt;tt&gt;prepare_timestamp&lt;/tt&gt; and then only block for reads higher than that.&lt;/p&gt;</comment>
                            <comment id="1932036" author="louis.williams" created="Tue, 26 Jun 2018 18:00:17 +0000"  >&lt;p&gt;Answering the question about WiredTiger prepare without a timestamp:&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;prepare_transaction&lt;/tt&gt;&#160;&lt;b&gt;could&lt;/b&gt;&#160;be modified so that when no timestamp is passed, it will return WT_PREPARE_CONFLICT for all reads or updates on documents that are part of a prepared transaction. The difference between this and the current behavior is that now all reads on a document at any timestamp, even &lt;b&gt;before&lt;/b&gt; the prepared timestamp, will introduce prepare conflicts. Like Spencer said, MongoDB does a blocking wait for prepared transactions to commit or abort when conflicts are encountered, so readers will have no choice but to wait for a transaction to commit before reading.&lt;/p&gt;</comment>
                            <comment id="1932011" author="xiangyu.yao" created="Tue, 26 Jun 2018 17:48:22 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=siyuan.zhou&quot; class=&quot;user-hover&quot; rel=&quot;siyuan.zhou&quot;&gt;siyuan.zhou&lt;/a&gt; Say we just open a transaction B at 12, and now we try to prepare the previous transaction A with prepare timestamp 10, then we don&apos;t know the change made in transaction A should be visible to transaction B because we could later set the commit timestamp at 11, 12 or later for transaction A.&lt;br/&gt;
If the commit timestamp is 11/12, the change should be visible to transaction B.&lt;br/&gt;
If the commit timestamp is greater than 12, the change should not be visible to transaction B.&lt;/p&gt;

&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;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=louis.williams&quot; class=&quot;user-hover&quot; rel=&quot;louis.williams&quot;&gt;louis.williams&lt;/a&gt; Are there any other reasons prepare timestamp should be greater than any open read timestamps?&lt;/p&gt;</comment>
                            <comment id="1931993" author="spencer" created="Tue, 26 Jun 2018 17:35:33 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=siyuan.zhou&quot; class=&quot;user-hover&quot; rel=&quot;siyuan.zhou&quot;&gt;siyuan.zhou&lt;/a&gt;, it&apos;s important that the prepare timestamp be greater than the read timestamp of any running read transactions as all reads at timestamps greater than the prepare timestamp that read documents modified in the prepared transaction are supposed to block until the transaction is committed so they can know what the commit time is and thus whether they should read the pre or post image of the document.  Without the invariant that the prepare timestamp is greater than the read timestamp of all running transactions then reads at timestamps higher than the prepare timestamp could read the document pre-image when they were supposed to return the post-image.&lt;/p&gt;

&lt;p&gt;I think the issue here isn&apos;t just that the prepare oplog entry pushes the lastApplied timestamp forward, as it&apos;d always be possible for a new write to come in and push the lastApplied forward.  So I think the only options are to either atomically allocate an optime and prepare the WUOW, while guaranteeing that no new optimes are handed out during that window, which is machinery we don&apos;t currently have and seems likely to introduce a perf hit, or to do what Judah proposed in the last comment - to effectively have two-phases to putting a WT transaction into prepare state.&lt;/p&gt;</comment>
                            <comment id="1931941" author="judah.schvimer" created="Tue, 26 Jun 2018 17:01:57 +0000"  >&lt;p&gt;After talking to &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=schwerin&quot; class=&quot;user-hover&quot; rel=&quot;schwerin&quot;&gt;schwerin&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=spencer&quot; class=&quot;user-hover&quot; rel=&quot;spencer&quot;&gt;spencer&lt;/a&gt;, one idea we think could work well is if we were able to call prepareTransaction() with no timestamp and block all reads on the affected documents, and later after writing the oplog entry and getting a prepareTimestamp we can set the prepareTimestamp and the blocking will begin to only happen on reads after the prepareTimestamp.&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; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=louis.williams&quot; class=&quot;user-hover&quot; rel=&quot;louis.williams&quot;&gt;louis.williams&lt;/a&gt;, what are your thoughts?&lt;/p&gt;</comment>
                            <comment id="1931858" author="siyuan.zhou@10gen.com" created="Tue, 26 Jun 2018 16:01:37 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=xiangyu.yao&quot; class=&quot;user-hover&quot; rel=&quot;xiangyu.yao&quot;&gt;xiangyu.yao&lt;/a&gt;, could you please explain why we disallow setting prepareTimestamp that&apos;s lower than or equal to the read timestamp of any running WT transactions? When discussing the proposal of reserving prepare timestamp, we were worried about the cost of WUOW::prepare() inside a mutex. Could you please shed some light on that?&lt;/p&gt;</comment>
                            <comment id="1931772" author="judah.schvimer" created="Tue, 26 Jun 2018 15:11:29 +0000"  >&lt;p&gt;Potential solutions:&lt;br/&gt;
1) reserve a prepare timestamp, set the prepare timestamp, and then log the oplog entry with that prepare timestamp. &lt;br/&gt;
    cons: potential long period of time with an oplog hole&lt;br/&gt;
2) don&apos;t set last applied when processing prepare commands&lt;br/&gt;
    cons: unclear what side effects this will have on the consensus protocol if any&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=siyuan.zhou&quot; class=&quot;user-hover&quot; rel=&quot;siyuan.zhou&quot;&gt;siyuan.zhou&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=spencer&quot; class=&quot;user-hover&quot; rel=&quot;spencer&quot;&gt;spencer&lt;/a&gt;, what do you think?&lt;/p&gt;</comment>
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                    </customfield>
                                                                                                                                                                                                                                        <customfield id="customfield_10557" key="com.pyxis.greenhopper.jira:gh-sprint">
                        <customfieldname>Sprint</customfieldname>
                        <customfieldvalues>
                                <customfieldvalue id="2383">Repl 2018-07-16</customfieldvalue>
    <customfieldvalue id="2384">Repl 2018-07-30</customfieldvalue>
    <customfieldvalue id="2447">Repl 2018-08-13</customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                                                                                                        <customfield id="customfield_10750" key="com.atlassian.jira.plugin.system.customfieldtypes:textarea">
                        <customfieldname>Steps To Reproduce</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>&lt;p&gt;commit: 8c5002b06fd737f75941a73785ce75e3ca7f5ce1&lt;br/&gt;
1. Put a 5 second sleep between (1) and (2) to increase the chance that another transaction starts in between.&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;
		&lt;tbody &gt;
				&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;   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;      opObserver-&amp;gt;onTransactionPrepare(opCtx);                                    &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;      lk.lock();                                                                  &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;      _checkIsActiveTransaction(lk, *opCtx-&amp;gt;getTxnNumber(), true);                &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;      invariant(_txnState == MultiDocumentTransactionState::kPrepared);           &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;+     sleep(5);                                                                   &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;                                                                                  &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;      opCtx-&amp;gt;getWriteUnitOfWork()-&amp;gt;prepare(); &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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-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; &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;2. repro.js:&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;
		&lt;tbody &gt;
				&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;   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;const session = db.getMongo().startSession({causalConsistency: false});            &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;const sessionDB = session.getDatabase(&apos;test&apos;);                                     &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;sessionDB.a.insert({x: 1});                                                        &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;session.startTransaction({readConcern: {level: &quot;snapshot&quot;}});                      &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;assert.commandWorked(sessionDB.runCommand({                                        &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;    update: &apos;a&apos;,                                                                   &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;    updates: [{q: {x: 1}, u: {$inc: {x: 1}}}],                                     &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;}));                                                                               &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;                                                                                   &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;let awaitShell = startParallelShell(function() {                                   &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;    const session = db.getMongo().startSession({causalConsistency: false});        &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;    const sessionDB = session.getDatabase(&apos;test&apos;);                                 &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;    while (1) {                                                                    &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;        session.startTransaction({readConcern: {level: &quot;snapshot&quot;}});              &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;        sessionDB.a.find().toArray();                                              &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;        session.abortTransaction();                                                &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;    }                                                                              &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;});                                                                                &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;                                                                                   &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;assert.commandWorked(sessionDB.adminCommand({prepareTransaction: 1}));             &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;session.abortTransaction();                                                        &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;                                                                                   &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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-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;awaitShell(); &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</customfieldvalue>

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