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    <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-49893] Create oplog fetcher for resharding</title>
                <link>https://jira.mongodb.org/browse/SERVER-49893</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The oplog fetcher for resharding should take the aggregation pipeline from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49891&quot; title=&quot;Write and test aggregation pipeline for oplog fetcher for resharding&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49891&quot;&gt;&lt;del&gt;SERVER-49891&lt;/del&gt;&lt;/a&gt;, run it against a particular donor, and insert the returned documents into the oplog buffer collection on itself (a recipient).&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Serialize the aggregation pipeline from createOplogFetchingPipelineForResharding() using Pipeline::serializeToBson() and use the serialized form to create an AggregationRequest.&lt;/li&gt;
	&lt;li&gt;Add the necessary read concern and hint to the AggregationRequest.&lt;/li&gt;
	&lt;li&gt;Run the aggregate command on the remote donor.  &lt;em&gt;We likely don&apos;t want to use ClusterAggregate::runAggregate() because we want a recipient to target each donor with a unique aggregation pipeline (unique due to different resume points).&lt;/em&gt;
	&lt;ul&gt;
		&lt;li&gt;&lt;em&gt;One option may be to use ShardRemote::runCommand() and Fetcher &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bbe2ef4b43290421b406684f204d0ef7100c5d57/src/mongo/s/client/shard_remote.cpp#L275-L325&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;like ShardRemote::_runExhaustiveCursorCommand&lt;/a&gt; does.&lt;/em&gt;&lt;/li&gt;
		&lt;li&gt;&lt;em&gt;Another option may be to use DBClientCursor &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bbe2ef4b43290421b406684f204d0ef7100c5d57/src/mongo/db/repl/oplog_fetcher.cpp#L503-L512&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;like OplogFetcher does&lt;/a&gt;. This is perhaps the only way to take advantage of the QueryOption_Exhaust option.&lt;/em&gt;&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;Use Collection::insertDocuments() to insert the documents into the new sharded collection.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1421052">SERVER-49893</key>
            <summary>Create oplog fetcher for resharding</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="daniel.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                            <label>PM-234-M2</label>
                            <label>PM-234-T-oplog-fetch</label>
                    </labels>
                <created>Sat, 25 Jul 2020 17:52:32 +0000</created>
                <updated>Sun, 29 Oct 2023 22:05:13 +0000</updated>
                            <resolved>Thu, 1 Oct 2020 13:06:42 +0000</resolved>
                                                    <fixVersion>4.8.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3420116" author="xgen-internal-githook" created="Thu, 1 Oct 2020 05:24:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Daniel Gottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;, &apos;username&apos;: &apos;dgottlieb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49893&quot; title=&quot;Create oplog fetcher for resharding&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49893&quot;&gt;&lt;del&gt;SERVER-49893&lt;/del&gt;&lt;/a&gt;: Do oplog fetching.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d286a563d4ad921331d7d3846181a5bb7192a31d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d286a563d4ad921331d7d3846181a5bb7192a31d&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1421053">SERVER-49894</issuekey>
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