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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-41074] Don&apos;t migrate prePostImageDoc session entries for CRUD operations outside of current migration range</title>
                <link>https://jira.mongodb.org/browse/SERVER-41074</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;ProblemStatement&quot;&gt;&lt;/a&gt;Problem Statement&lt;/h2&gt;

&lt;p&gt;When migrating retryable CRUD op session entries, we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/204352fb65123323bb50800741b1b322fe648f15/src/mongo/db/s/session_catalog_migration_source.cpp#L263-L269&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;generate a prePostImage oplog entry&lt;/a&gt; if necessary. &lt;/p&gt;

&lt;p&gt;Later in the process, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/204352fb65123323bb50800741b1b322fe648f15/src/mongo/db/s/migration_chunk_cloner_source_legacy.cpp#L90-L102&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;we filter out these CRUD op entries&lt;/a&gt;,  but &lt;em&gt;not&lt;/em&gt; their corresponding prePostImageOplog entries. We skip the latter because the prePostImage oplog entries are created as no-ops. &lt;/p&gt;

&lt;p&gt;We should also filter out corresponding prePostImage oplog entries.&lt;/p&gt;

&lt;h2&gt;&lt;a name=&quot;ProposedSolution&quot;&gt;&lt;/a&gt;Proposed Solution&lt;/h2&gt;

&lt;p&gt;We currently have two types of no-op entries that will come through the session catalog migration pipeline. These are either sentinel oplog entries or prePostImage oplog entries. We should:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Automatically let sentinel oplog entries pass through, and&lt;/li&gt;
	&lt;li&gt;Check the pre- or postImage in prePostImage oplog entries to filter based on a mismatched shard key.&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="763580">SERVER-41074</key>
            <summary>Don&apos;t migrate prePostImageDoc session entries for CRUD operations outside of current migration range</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="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                    </labels>
                <created>Thu, 9 May 2019 20:36:25 +0000</created>
                <updated>Sun, 29 Oct 2023 22:21:11 +0000</updated>
                            <resolved>Fri, 17 May 2019 20:51:16 +0000</resolved>
                                                    <fixVersion>4.1.12</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2251185" author="xgen-internal-githook" created="Fri, 17 May 2019 20:50:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;randolph@10gen.com&apos;, &apos;name&apos;: &apos;Randolph Tan&apos;, &apos;username&apos;: &apos;renctan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41074&quot; title=&quot;Don&amp;#39;t migrate prePostImageDoc session entries for CRUD operations outside of current migration range&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41074&quot;&gt;&lt;del&gt;SERVER-41074&lt;/del&gt;&lt;/a&gt; Make decision to send pre/post image oplog the same as the decision made for the originating oplog write.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/32ade4aa6b6a73c3620486117388908ad9ad438c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/32ade4aa6b6a73c3620486117388908ad9ad438c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2246365" author="blake.oler" created="Tue, 14 May 2019 18:28:41 +0000"  >&lt;p&gt;Yes. That is the issue that we discussed today (ticket to follow). This issue exists independent of any changes to the document shard key. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=renctan&quot; class=&quot;user-hover&quot; rel=&quot;renctan&quot;&gt;renctan&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2242230" author="renctan" created="Fri, 10 May 2019 15:10:01 +0000"  >&lt;p&gt;With change shard key project, isn&apos;t it possible for the post-image to have different shard key and thus ending up on a different chunk but on the same shard? Or is findAndModify exempt from the in-place update optimization for change shard key?&lt;/p&gt;</comment>
                            <comment id="2240570" author="blake.oler" created="Thu, 9 May 2019 20:42:03 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=renctan&quot; class=&quot;user-hover&quot; rel=&quot;renctan&quot;&gt;renctan&lt;/a&gt;&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; if (oplogEntryIsSentinel(oplog)) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;        return true;&lt;/span&gt;&lt;/pre&gt;
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				&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;
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						&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;&amp;nbsp;&lt;/pre&gt;
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						&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;    // Skip appending CRUD operations that don&apos;t pertain to the ChunkRange being migrated.&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;    if (oplog.isCrudOpType() || oplog.getOpType() == repl::OpTypeEnum::kNoop) {&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;        auto shardKey = keyPattern.extractShardKeyFromDoc(oplog.getOperationToApply());&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;        if (!range.containsKey(shardKey)) {&lt;/span&gt;&lt;/pre&gt;
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				&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;            return false;&lt;/span&gt;&lt;/pre&gt;
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				&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;
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				&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;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Approach LGTY?&lt;/p&gt;</comment>
                    </comments>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="704841">SERVER-39844</issuekey>
        </issuelink>
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            <issuekey id="1681185">SERVER-56127</issuekey>
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