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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>
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<item>
            <title>[SERVER-46720] Make replication internal message non-strict parsing</title>
                <link>https://jira.mongodb.org/browse/SERVER-46720</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Since we have IDL for most of the messages, internal messages don&apos;t need strict parsing. It causes extra work on upgrade / downgrade procedures.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1253668">SERVER-46720</key>
            <summary>Make replication internal message non-strict parsing</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="william.schultz@mongodb.com">William Schultz</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                            <label>safe-reconfig-related</label>
                    </labels>
                <created>Mon, 9 Mar 2020 17:05:34 +0000</created>
                <updated>Sun, 29 Oct 2023 22:11:05 +0000</updated>
                            <resolved>Thu, 16 Apr 2020 03:23:48 +0000</resolved>
                                                    <fixVersion>4.4.0-rc4</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3065252" author="xgen-internal-githook" created="Fri, 1 May 2020 20:40:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;William Schultz&apos;, &apos;email&apos;: &apos;william.schultz@mongodb.com&apos;, &apos;username&apos;: &apos;will62794&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46720&quot; title=&quot;Make replication internal message non-strict parsing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46720&quot;&gt;&lt;del&gt;SERVER-46720&lt;/del&gt;&lt;/a&gt; Allow non strict parsing of the LastVote document&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 0793797e87ea2c9c6e0a92f5fd704da15ffc0e51)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f0fd129b5a9df4db2d6800f20773c878da36af1b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f0fd129b5a9df4db2d6800f20773c878da36af1b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3064992" author="xgen-internal-githook" created="Fri, 1 May 2020 18:22:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;William Schultz&apos;, &apos;email&apos;: &apos;william.schultz@mongodb.com&apos;, &apos;username&apos;: &apos;will62794&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46720&quot; title=&quot;Make replication internal message non-strict parsing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46720&quot;&gt;&lt;del&gt;SERVER-46720&lt;/del&gt;&lt;/a&gt; Allow non strict replication message parsing&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 9c5d82ff1fb2bb7367e10c9e21ac67b440e7097e)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3595fb6b5ff9ed270dc40d27231378df09a967c7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3595fb6b5ff9ed270dc40d27231378df09a967c7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3041875" author="xgen-internal-githook" created="Thu, 16 Apr 2020 03:21:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;William Schultz&apos;, &apos;email&apos;: &apos;william.schultz@mongodb.com&apos;, &apos;username&apos;: &apos;will62794&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46720&quot; title=&quot;Make replication internal message non-strict parsing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46720&quot;&gt;&lt;del&gt;SERVER-46720&lt;/del&gt;&lt;/a&gt; Allow non strict parsing of the LastVote document&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0793797e87ea2c9c6e0a92f5fd704da15ffc0e51&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0793797e87ea2c9c6e0a92f5fd704da15ffc0e51&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3034410" author="xgen-internal-githook" created="Fri, 10 Apr 2020 00:34:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;William Schultz&apos;, &apos;email&apos;: &apos;william.schultz@mongodb.com&apos;, &apos;username&apos;: &apos;will62794&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46720&quot; title=&quot;Make replication internal message non-strict parsing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46720&quot;&gt;&lt;del&gt;SERVER-46720&lt;/del&gt;&lt;/a&gt; Allow non strict replication message parsing&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9c5d82ff1fb2bb7367e10c9e21ac67b440e7097e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9c5d82ff1fb2bb7367e10c9e21ac67b440e7097e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3003905" author="judah.schvimer" created="Fri, 27 Mar 2020 12:12:45 +0000"  >&lt;blockquote&gt;
&lt;p&gt;If they don&apos;t follow the downgrade procedures, would they have FCV 4.6? If so, starting binary 4.4 with FCV 4.6 will fail loudly.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;This is a good point, thank you! I think you&apos;re right that ISS doesn&apos;t have a problem with non-strict on-disk parsing. I don&apos;t see how &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47007&quot; title=&quot;candidateIndex field of LastVote document is meaningless&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47007&quot;&gt;SERVER-47007&lt;/a&gt; benefits from non-strict parsing, though. My understanding of this ticket is that nodes will ignore extra fields, not that they will ignore missing fields. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47007&quot; title=&quot;candidateIndex field of LastVote document is meaningless&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47007&quot;&gt;SERVER-47007&lt;/a&gt; requires removing a field, not adding one. Either way, I&apos;m fine relaxing on-disk parsing since it won&apos;t complicate ISS.&lt;/p&gt;</comment>
                            <comment id="3003422" author="siyuan.zhou@10gen.com" created="Thu, 26 Mar 2020 22:48:32 +0000"  >&lt;blockquote&gt;&lt;p&gt;Initial Sync Semantics downgrade design relies on 4.4 nodes fasserting when they see a &quot;newlyAdded&quot; field, since they won&apos;t know how to interpret it correctly.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;I thought we will do a reconfig on FCV downgrade, so I don&apos;t see why downgrade relies on the fassert.&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;If users follow proper downgrade procedures it shouldn&apos;t be a problem, but we were relying on this for when they don&apos;t.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;If they don&apos;t follow the downgrade procedures, would they have FCV 4.6? If so, starting binary 4.4 with FCV 4.6 will fail loudly.&lt;/p&gt;

&lt;p&gt;Without non-strict parsing, any change to the on-disk format will be a backward compatible problem. LastVote in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47007&quot; title=&quot;candidateIndex field of LastVote document is meaningless&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47007&quot;&gt;SERVER-47007&lt;/a&gt; is an example as mentioned above. We&apos;d have to explicitly update LastVote on FCV downgrade otherwise.&lt;/p&gt;</comment>
                            <comment id="3003400" author="judah.schvimer" created="Thu, 26 Mar 2020 22:26:48 +0000"  >&lt;p&gt;Initial Sync Semantics downgrade design relies on 4.4 nodes fasserting when they see a &quot;newlyAdded&quot; field, since they won&apos;t know how to interpret it correctly.  If users follow proper downgrade procedures it shouldn&apos;t be a problem, but we were relying on this for when they don&apos;t. I had previously thought that we would only relax network message parsing, not on disk parsing. I think in this case it&apos;s fine but I will have to think more to determine if it&apos;s safe if we choose to relax on disk parsing, or if it will complicate ISS downgrade. I&apos;m nervous about nodes ignoring data on disk.&lt;/p&gt;</comment>
                            <comment id="3003205" author="siyuan.zhou@10gen.com" created="Thu, 26 Mar 2020 20:43:24 +0000"  >&lt;p&gt;&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;, I think so. Do you have any concern?&lt;/p&gt;</comment>
                            <comment id="3002920" author="judah.schvimer" created="Thu, 26 Mar 2020 18:31:15 +0000"  >&lt;p&gt;Did we decide on if this would include relaxing on disk parsing?&lt;/p&gt;</comment>
                            <comment id="2975014" author="siyuan.zhou@10gen.com" created="Thu, 12 Mar 2020 15:55:06 +0000"  >&lt;p&gt;LastVote is another example, strict parsing makes it hard to record the candidate ID rather than the candidate index.&lt;/p&gt;</comment>
                            <comment id="2974904" author="siyuan.zhou@10gen.com" created="Thu, 12 Mar 2020 15:37:14 +0000"  >&lt;p&gt;We should also consider relax the constraints on on-disk format to make future upgrade/downgrade work easier or introduce new fields in minor versions. For example, that will let us replace replica set name with replica set ID to support replset renaming or allow alias for slaveDelay without upgrade / downgrade concerns.&lt;/p&gt;</comment>
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