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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-60037] Enable the ordered timestamp assertion in MongoDB</title>
                <link>https://jira.mongodb.org/browse/SERVER-60037</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It would be helpful for WiredTiger if we could turn on some assertions about timestamps, and as discussed in a recent meeting we should try to enable the &lt;tt&gt;mixed_mode&lt;/tt&gt; timestamp assertion. I have attempted this and created a MongoDB patch build to check the fallout and there was still a significant amount. This is a shared ticket and will require a developer from the WiredTiger team and SERVER as fixing the test failures will be an iterative process.&lt;/p&gt;

&lt;p&gt;When encountering a test failure a separate ticket should be created to fix the failure (if possible) and then this ticket will proceed once that ticket is completed, with the goal of one day enabling the assertion and merging it to master.&lt;/p&gt;

&lt;p&gt;The patch I used to enable it was (it may not apply correctly so just take the config change):&lt;/p&gt;
&lt;p/&gt;
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					&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;     if (wiredTigerGlobalOptions.useCollectionPrefixCompression) {&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="1876924">SERVER-60037</key>
            <summary>Enable the ordered timestamp assertion in MongoDB</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="yuhong.zhang@mongodb.com">Yuhong Zhang</assignee>
                                    <reporter username="luke.pearson@mongodb.com">Luke Pearson</reporter>
                        <labels>
                            <label>CA-PM</label>
                            <label>post-mortem</label>
                    </labels>
                <created>Fri, 17 Sep 2021 05:29:40 +0000</created>
                <updated>Sun, 29 Oct 2023 21:48:30 +0000</updated>
                            <resolved>Mon, 15 Nov 2021 21:50:14 +0000</resolved>
                                                    <fixVersion>5.2.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="4189822" author="xgen-internal-githook" created="Mon, 15 Nov 2021 19:02:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Yuhong Zhang&apos;, &apos;email&apos;: &apos;danielzhangyh@gmail.com&apos;, &apos;username&apos;: &apos;YuhongZhang98&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60037&quot; title=&quot;Enable the ordered timestamp assertion in MongoDB&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60037&quot;&gt;&lt;del&gt;SERVER-60037&lt;/del&gt;&lt;/a&gt; Enable the ordered timestamp assertion in MongoDB&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4cd66c0f2fe2912a5261d26bbc9608873fc22303&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4cd66c0f2fe2912a5261d26bbc9608873fc22303&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4135386" author="xgen-internal-githook" created="Wed, 20 Oct 2021 14:52:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Yuhong Zhang&apos;, &apos;email&apos;: &apos;danielzhangyh@gmail.com&apos;, &apos;username&apos;: &apos;YuhongZhang98&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60037&quot; title=&quot;Enable the ordered timestamp assertion in MongoDB&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60037&quot;&gt;&lt;del&gt;SERVER-60037&lt;/del&gt;&lt;/a&gt; Enable the ordered timestamp assertion in MongoDB&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit bf4cd96645253bb29a32ec0568095049bc49ab77.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5d54422313209ae5dc5be5de65450cce58a0ff00&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5d54422313209ae5dc5be5de65450cce58a0ff00&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4133220" author="JIRAUSER1253424" created="Tue, 19 Oct 2021 18:22:58 +0000"  >&lt;p&gt;Instead of following the approach &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=luke.pearson&quot; class=&quot;user-hover&quot; rel=&quot;luke.pearson&quot;&gt;luke.pearson&lt;/a&gt;&#160;suggested, we skipped the checking on certain namespaces to enable the ordered timestamp assertion for the rest of the system first and filed the linked tickets to investigate the solutions to the existing issues.&lt;/p&gt;</comment>
                            <comment id="4133133" author="xgen-internal-githook" created="Tue, 19 Oct 2021 17:57:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Yuhong Zhang&apos;, &apos;email&apos;: &apos;danielzhangyh@gmail.com&apos;, &apos;username&apos;: &apos;YuhongZhang98&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60037&quot; title=&quot;Enable the ordered timestamp assertion in MongoDB&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60037&quot;&gt;&lt;del&gt;SERVER-60037&lt;/del&gt;&lt;/a&gt; Enable the ordered timestamp assertion in MongoDB&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bf4cd96645253bb29a32ec0568095049bc49ab77&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bf4cd96645253bb29a32ec0568095049bc49ab77&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4122936" author="luke.pearson" created="Wed, 13 Oct 2021 22:33:45 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=yuhong.zhang&quot; class=&quot;user-hover&quot; rel=&quot;yuhong.zhang&quot;&gt;yuhong.zhang&lt;/a&gt; the only difference for you is to change &lt;tt&gt;write_timestamp_usage=mixed_mode&lt;/tt&gt; to &lt;tt&gt;write_timestamp_usage=ordered&lt;/tt&gt; the other configuration option remain the same.&lt;/p&gt;</comment>
                            <comment id="4122667" author="luke.pearson" created="Wed, 13 Oct 2021 20:33:25 +0000"  >&lt;p&gt;I believe we were aiming lower as the &quot;mixed-mode&quot; assertion allows mixed mode updates while the ordered timestamp assertion does not. I am very happy to aim higher if it is achievable.&lt;/p&gt;</comment>
                            <comment id="4122657" author="daniel.gottlieb@10gen.com" created="Wed, 13 Oct 2021 20:29:00 +0000"  >&lt;p&gt;I changed the title to turning on the &quot;ordered&quot; timestamp assertion which I believe is a stronger guarantee as it disallows mixed-mode and out of order writes. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=luke.pearson&quot; class=&quot;user-hover&quot; rel=&quot;luke.pearson&quot;&gt;luke.pearson&lt;/a&gt;, please reach out if this is not the case, or if we&apos;re intentionally shooting for a lower bar.&lt;/p&gt;</comment>
                            <comment id="4121826" author="JIRAUSER1253424" created="Wed, 13 Oct 2021 15:51:22 +0000"  >&lt;p&gt;Thanks to the pointers from &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=gregory.noma&quot; class=&quot;user-hover&quot; rel=&quot;gregory.noma&quot;&gt;gregory.noma&lt;/a&gt;, we suspect there might be some implementation details on multikey indexes that violate the in-order restriction. I managed to reproduce the issue with the following steps:&lt;br/&gt;
 1. Start a replset&lt;br/&gt;
 2. In a mongo shell run (the order of the indexes and documents matter)&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;</comment>
                            <comment id="4097499" author="JIRAUSER1253424" created="Fri, 1 Oct 2021 20:14:15 +0000"  >&lt;p&gt;I uploaded a new &lt;a href=&quot;https://spruce.mongodb.com/version/615747d31e2d17316250f02a/tasks?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;patch&lt;/a&gt;&#160;with all three configurations turned on as well as an extra comma to fix the parsing errors, and I believe now it&apos;s more accurately showing the list of failing tests.&#160;&lt;/p&gt;

&lt;p&gt;A quick look at the failing tasks: the only failing tests are &quot;jstests/aggregation/group_conversion_to_distinct_scan.js&quot; and &quot;jstests/core/sort_merge.js&quot; under different suites, as well as &quot;StorageTimestampTests&quot; and &quot;repl&quot; in dbtests. All failing tests failed &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/third_party/wiredtiger/src/txn/txn.c#L966&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this&lt;/a&gt;&#160;check and printed out something similar to&lt;/p&gt;
&lt;p/&gt;
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					&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;&quot;WiredTiger message&quot;,&quot;attr&quot;:\{&quot;message&quot;:&quot;Commit timestamp unexpected usage: committing a transaction that updates a value with an older timestamp ((1633112096, 1)) than is associated with the previous update ((1633112096, 2)) on a table configured for mixed mode ordering&quot;}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;There isn&apos;t any failures on Enterprise RHEL variants (maybe the configs were not setup there?).&lt;/p&gt;</comment>
                            <comment id="4085255" author="luke.pearson" created="Mon, 27 Sep 2021 01:22:06 +0000"  >&lt;p&gt;I&apos;m unsure if the above patch build is valid however it turns out you should have minimum 3 configurations enabled and passed in the create config. &lt;br/&gt;
&lt;tt&gt;write_timestamp_usage=mixed_mode,assert=(write_timestamp=on),verbose=&lt;span class=&quot;error&quot;&gt;&amp;#91;write_timestamp&amp;#93;&lt;/span&gt;&lt;/tt&gt;&lt;/p&gt;</comment>
                            <comment id="4067612" author="luke.pearson" created="Fri, 17 Sep 2021 05:33:05 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=connie.chen&quot; class=&quot;user-hover&quot; rel=&quot;connie.chen&quot;&gt;connie.chen&lt;/a&gt;, its not clear exactly which team in SERVER would be required, I think both replication and storage execution? Either way this ticket represents a lot of shared effort so keep that in mind for scheduling.&lt;/p&gt;

&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; has some context around this ticket if you need further clarification.&lt;/p&gt;</comment>
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