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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-31941] Disallow retryable writes in storage engines which do not support document-level locking</title>
                <link>https://jira.mongodb.org/browse/SERVER-31941</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;While retryable writes works in MMAPV1, due to the collection-level locking its performance is so bad that it cannot be used in practice. Because of this, we should disable retryable writes if &lt;tt&gt;StorageEngine::supportsDocLocking() == false&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;The effective behaviour should be that if the storage engine doesn&apos;t support document-level locking, any requests which include a txnNumber should fail with code &lt;tt&gt;UnsupportedOperation&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="458007">SERVER-31941</key>
            <summary>Disallow retryable writes in storage engines which do not support document-level locking</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="jack.mulrow@mongodb.com">Jack Mulrow</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                            <label>bkp</label>
                    </labels>
                <created>Mon, 13 Nov 2017 18:44:22 +0000</created>
                <updated>Mon, 30 Oct 2023 23:10:34 +0000</updated>
                            <resolved>Fri, 17 Nov 2017 21:14:03 +0000</resolved>
                                    <version>3.6.0-rc3</version>
                                    <fixVersion>3.6.0-rc5</fixVersion>
                    <fixVersion>3.7.1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="1732240" author="xgen-internal-githook" created="Tue, 21 Nov 2017 21:40:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;username&apos;: &apos;jsmulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31941&quot; title=&quot;Disallow retryable writes in storage engines which do not support document-level locking&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31941&quot;&gt;&lt;del&gt;SERVER-31941&lt;/del&gt;&lt;/a&gt; Don&apos;t run retryable writes tests with ephemeralForTest storage engine&lt;/p&gt;

&lt;p&gt;(cherry picked from commit aacd508f5092b433df5bf0ea0e1c03844fffc2bb)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/878d9058e2617506e9eaac03fc1348d7a9c5821a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/878d9058e2617506e9eaac03fc1348d7a9c5821a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1732088" author="xgen-internal-githook" created="Tue, 21 Nov 2017 20:02:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;username&apos;: &apos;jsmulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31941&quot; title=&quot;Disallow retryable writes in storage engines which do not support document-level locking&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31941&quot;&gt;&lt;del&gt;SERVER-31941&lt;/del&gt;&lt;/a&gt; Don&apos;t run retryable writes tests with ephemeralForTest storage engine&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/aacd508f5092b433df5bf0ea0e1c03844fffc2bb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/aacd508f5092b433df5bf0ea0e1c03844fffc2bb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1729335" author="xgen-internal-githook" created="Fri, 17 Nov 2017 21:20:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;username&apos;: &apos;jsmulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31941&quot; title=&quot;Disallow retryable writes in storage engines which do not support document-level locking&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31941&quot;&gt;&lt;del&gt;SERVER-31941&lt;/del&gt;&lt;/a&gt; Disallow retryable writes in storage engines that do not support document-level locking&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 97af8701b538754261e566b26fa22cb4b54710f3)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2879ea38d96149ea15525cb289744f32aa42f6da&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2879ea38d96149ea15525cb289744f32aa42f6da&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1729323" author="xgen-internal-githook" created="Fri, 17 Nov 2017 21:10:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;username&apos;: &apos;jsmulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31941&quot; title=&quot;Disallow retryable writes in storage engines which do not support document-level locking&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31941&quot;&gt;&lt;del&gt;SERVER-31941&lt;/del&gt;&lt;/a&gt; Disallow retryable writes in storage engines that do not support document-level locking&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/97af8701b538754261e566b26fa22cb4b54710f3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/97af8701b538754261e566b26fa22cb4b54710f3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1726540" author="renctan" created="Wed, 15 Nov 2017 16:14:24 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=shane.harvey&quot; class=&quot;user-hover&quot; rel=&quot;shane.harvey&quot;&gt;shane.harvey&lt;/a&gt; They should be harmless. The secondary application of these oplog entries should have minimal difference in terms of overhead when compared to WiredTiger. There would be a huge performance impact on migrations if the user is using mixed storage engine shards and the mmap becomes the primary during migraitons though.&lt;/p&gt;</comment>
                            <comment id="1725829" author="shane.harvey" created="Tue, 14 Nov 2017 22:45:50 +0000"  >&lt;p&gt;txnNumbers show up in the oplog entries for write commands:&lt;/p&gt;
&lt;p/&gt;
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			&lt;/td&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;What happens when an MMAPv1 secondary applies such an oplog entry from a WiredTiger primary?&lt;/p&gt;</comment>
                            <comment id="1725697" author="kaloian.manassiev" created="Tue, 14 Nov 2017 21:16:51 +0000"  >&lt;p&gt;After further discussion, it appears that the requested &lt;tt&gt;retryableWrites&lt;/tt&gt; field on the isMaster response counts as a &quot;feature test&quot; and it is the general consensus on the server that there is no good way to support that in a sharded cluster due to the possibility of the constituent nodes to change.&lt;/p&gt;

&lt;p&gt;Because of this we are &lt;b&gt;not&lt;/b&gt; going to add the &quot;retryableWrites&quot; field on isMaster. The driver should just send the retries blindly as it does now and if the node doesn&apos;t support them so be it.&lt;/p&gt;

&lt;p&gt;cc &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jesse&quot; class=&quot;user-hover&quot; rel=&quot;jesse&quot;&gt;jesse&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=behackett&quot; class=&quot;user-hover&quot; rel=&quot;behackett&quot;&gt;behackett&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1724681" author="jesse" created="Mon, 13 Nov 2017 22:57:34 +0000"  >&lt;p&gt;This is consistent with our philosophy about Retryable Writes so far: if the URI contains &quot;retryWrites=true&quot; then drivers retry all operations they can but don&apos;t error if there are operations they can&apos;t. So if the operation isn&apos;t retryable (dropDatabase) or the server doesn&apos;t support retries (standalone, MongoDB 3.4) then we ignore the &quot;retryWrites&quot; setting. Doing the same thing for MMAPv1 is consistent.&lt;/p&gt;</comment>
                            <comment id="1724654" author="kaloian.manassiev" created="Mon, 13 Nov 2017 22:40:05 +0000"  >&lt;p&gt;I don&apos;t think it is a problem to add it to master as part of this commit. It will be the same check that we need to do for the actual operations, so it&apos;s fairly simple.&lt;/p&gt;</comment>
                            <comment id="1724619" author="behackett" created="Mon, 13 Nov 2017 22:15:18 +0000"  >&lt;p&gt;I don&apos;t see how we have a choice. How quickly can it be added to ismaster?&lt;/p&gt;</comment>
                            <comment id="1724609" author="kaloian.manassiev" created="Mon, 13 Nov 2017 22:01:27 +0000"  >&lt;p&gt;Add a &lt;tt&gt;retryableWrites&lt;/tt&gt; field to the isMaster response sounds like a reasonable solution. Is this something that can be incorporated in all the drivers by GA time?&lt;/p&gt;

&lt;p&gt;cc &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;.&lt;/p&gt;</comment>
                            <comment id="1724564" author="jesse" created="Mon, 13 Nov 2017 21:29:02 +0000"  >&lt;p&gt;I propose a new isMaster response field, &quot;retryableWrites: &amp;lt;bool&amp;gt;&quot;. It&apos;s false if sessions are not supported (so it&apos;s false if logicalSessionTimeoutMinutes is absent) and it&apos;s also false if the storage engine doesn&apos;t support document-level locking.&lt;/p&gt;</comment>
                            <comment id="1724533" author="behackett" created="Mon, 13 Nov 2017 21:08:22 +0000"  >&lt;p&gt;How will this present to drivers? We determine support for retryable writes by server support for sessions. Specifically if the ismaster command returns the logicalSessionTimeoutMinutes field.&lt;/p&gt;</comment>
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