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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-40684] Ban transactions against capped collections on non-shard-servers</title>
                <link>https://jira.mongodb.org/browse/SERVER-40684</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Suggesting testing insert/update/insert such that it exceeds the capped limit, both in a successful operation and as part of a txn that rolls back.&lt;/p&gt;</description>
                <environment></environment>
        <key id="740066">SERVER-40684</key>
            <summary>Ban transactions against capped collections on non-shard-servers</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="vesselina.ratcheva@mongodb.com">Vesselina Ratcheva</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                            <label>prepare_errors</label>
                    </labels>
                <created>Tue, 16 Apr 2019 22:54:42 +0000</created>
                <updated>Sun, 29 Oct 2023 22:21:55 +0000</updated>
                            <resolved>Mon, 13 May 2019 22:42:47 +0000</resolved>
                                                    <fixVersion>4.1.12</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2245274" author="xgen-internal-githook" created="Mon, 13 May 2019 22:38:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Vesselina Ratcheva&apos;, &apos;username&apos;: &apos;vessy-mongodb&apos;, &apos;email&apos;: &apos;vesselina.ratcheva@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40684&quot; title=&quot;Ban transactions against capped collections on non-shard-servers&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40684&quot;&gt;&lt;del&gt;SERVER-40684&lt;/del&gt;&lt;/a&gt; Ban transactions against capped collections&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9ab10de2762ba48532d9bc6717a434672eee8475&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9ab10de2762ba48532d9bc6717a434672eee8475&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2233779" author="judah.schvimer" created="Fri, 3 May 2019 15:44:27 +0000"  >&lt;p&gt;After discussing with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alyson.cabral&quot; class=&quot;user-hover&quot; rel=&quot;alyson.cabral&quot;&gt;alyson.cabral&lt;/a&gt;, it seems easiest and safest to ban capped collections entirely in transactions on 4.2 (shard servers or not). We will decide whether to improve testing on 4.0 of capped collections in transactions or backport the ban after 4.2 is out the door.&lt;/p&gt;</comment>
                            <comment id="2221098" author="dianna.hohensee" created="Mon, 22 Apr 2019 20:30:34 +0000"  >&lt;p&gt;I would guess that it takes S for reads and X for writes, but I don&apos;t know where the code is without looking.&lt;/p&gt;</comment>
                            <comment id="2221088" author="dianna.hohensee" created="Mon, 22 Apr 2019 20:25:47 +0000"  >&lt;p&gt;I just banned capped collections from transactions on shard servers. So we already decided that capped collections can only be in non-shard replica set transactions. I think all this ticket needs is testing. Geert was uncomfortable with the lack of testing after I altered some incidental testing that didn&apos;t really have enough coverage anyway.&lt;/p&gt;</comment>
                            <comment id="2221013" author="siyuan.zhou@10gen.com" created="Mon, 22 Apr 2019 19:39:52 +0000"  >&lt;p&gt;Cool! Out of curiosity, which strong locks are you referring to? I&apos;m fine with either supporting it or banning it. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alyson.cabral&quot; class=&quot;user-hover&quot; rel=&quot;alyson.cabral&quot;&gt;alyson.cabral&lt;/a&gt; doesn&apos;t think this is an important change to users, so I guess we should do whichever is easier. It seems testing is easier to me.&lt;/p&gt;</comment>
                            <comment id="2220891" author="dianna.hohensee" created="Mon, 22 Apr 2019 18:31:07 +0000"  >&lt;p&gt;I believe the story is that it&apos;s safe because we serialize access to capped collections &amp;#8211; strong locks are taken --, so we cannot conflict with anything once the lock is acquired.&lt;/p&gt;</comment>
                            <comment id="2220830" author="siyuan.zhou@10gen.com" created="Mon, 22 Apr 2019 18:05:58 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dianna.hohensee&quot; class=&quot;user-hover&quot; rel=&quot;dianna.hohensee&quot;&gt;dianna.hohensee&lt;/a&gt;, if the document modified by a running transaction is about to be removed by the capped collection, does that cause infinite write conflict for the removal until the transaction finishes?&#160;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=judah.schvimer&quot; class=&quot;user-hover&quot; rel=&quot;judah.schvimer&quot;&gt;judah.schvimer&lt;/a&gt; pointed out that 4.0 currently supports transactions on capped collections.&#160;I&apos;m wondering about the expected behavior and whether we need to ban capped collections in general both in 4.2 and 4.0.&#160;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is documented by">
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            <issuekey id="873264">SERVER-42372</issuekey>
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            <issuekey id="722015">SERVER-40321</issuekey>
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            <issuekey id="1331738">SERVER-47824</issuekey>
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