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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-51245] Adapt resharding&apos;s oplog fetcher to use the `Shard` interface for running commands</title>
                <link>https://jira.mongodb.org/browse/SERVER-51245</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Resharding&apos;s oplog fetcher is currently using a &lt;tt&gt;DBClientBase&lt;/tt&gt; for running&#160;an aggregation request to fetch oplog entries.&lt;/p&gt;

&lt;p&gt;The DBClientBase omits some critical behavior such as:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Not updating the logical clock values when receiving a response&lt;/li&gt;
	&lt;li&gt;Does not perform targetting&lt;/li&gt;
	&lt;li&gt;Will not use connections from a pool&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Likewise, &lt;tt&gt;Shard&lt;/tt&gt; has some limitations that made it difficult to use for the first milestone:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Lack of aggregation support&lt;/li&gt;
	&lt;li&gt;Does not expose a cursor/streaming interface&lt;br/&gt;
&lt;tt&gt;Shard&lt;/tt&gt; also does not support exhaust cursors which is not necessary for a milestone, but would be an unfortunate lost optimization. It&apos;s unlikely that the underlying async &lt;tt&gt;Fetcher&lt;/tt&gt; library that &lt;tt&gt;Shard&lt;/tt&gt; uses will ever be able to make use of exhaust cursors.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;When doing this ticket, it may be worth considering some unrealized optimizations when writing documents into the oplog. Specifically, batching an entire response into a single WUOW/transaction without requiring the caller making a copy of the response&apos;s buffer of BSON objects.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1496447">SERVER-51245</key>
            <summary>Adapt resharding&apos;s oplog fetcher to use the `Shard` interface for running commands</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="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                            <label>PM-234-M2</label>
                            <label>PM-234-T-oplog-fetch</label>
                    </labels>
                <created>Wed, 30 Sep 2020 19:04:55 +0000</created>
                <updated>Sun, 29 Oct 2023 22:02:37 +0000</updated>
                            <resolved>Wed, 25 Nov 2020 16:54:47 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3507295" author="xgen-internal-githook" created="Fri, 27 Nov 2020 15:14:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Max Hirschhorn&apos;, &apos;email&apos;: &apos;max.hirschhorn@mongodb.com&apos;, &apos;username&apos;: &apos;visemet&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51245&quot; title=&quot;Adapt resharding&amp;#39;s oplog fetcher to use the `Shard` interface for running commands&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51245&quot;&gt;&lt;del&gt;SERVER-51245&lt;/del&gt;&lt;/a&gt; Use ThreadClient with launchAsync().&lt;/p&gt;

&lt;p&gt;Windows reuses threads with std::async() and so the Client won&apos;t&lt;br/&gt;
necessarily be destructed otherwise.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b8287c2fca88e46285a250c3b585f393418f6eef&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b8287c2fca88e46285a250c3b585f393418f6eef&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3506808" author="xgen-internal-githook" created="Thu, 26 Nov 2020 18:53:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Max Hirschhorn&apos;, &apos;email&apos;: &apos;max.hirschhorn@mongodb.com&apos;, &apos;username&apos;: &apos;visemet&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51245&quot; title=&quot;Adapt resharding&amp;#39;s oplog fetcher to use the `Shard` interface for running commands&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51245&quot;&gt;&lt;del&gt;SERVER-51245&lt;/del&gt;&lt;/a&gt; Fix compile on Windows DEBUG.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7e1171785e8efbdbdc661543607872a41cf8a1e2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7e1171785e8efbdbdc661543607872a41cf8a1e2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3505578" author="xgen-internal-githook" created="Wed, 25 Nov 2020 16:52:53 +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-51245&quot; title=&quot;Adapt resharding&amp;#39;s oplog fetcher to use the `Shard` interface for running commands&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51245&quot;&gt;&lt;del&gt;SERVER-51245&lt;/del&gt;&lt;/a&gt;: Have resharding oplog fetching use a Fetcher.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2d295d7b205dcac66d434929553610dd48ac0815&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2d295d7b205dcac66d434929553610dd48ac0815&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3504929" author="xgen-internal-githook" created="Wed, 25 Nov 2020 09:54:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Uladzimir Makouski&apos;, &apos;email&apos;: &apos;uladzimir.makouski@mongodb.com&apos;, &apos;username&apos;: &apos;umakouski&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51245&quot; title=&quot;Adapt resharding&amp;#39;s oplog fetcher to use the `Shard` interface for running commands&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51245&quot;&gt;&lt;del&gt;SERVER-51245&lt;/del&gt;&lt;/a&gt;: Have resharding oplog fetching use a Fetcher.&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit cda3a52701fe4143b06bd981b98514e69d0a93eb.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7b92716c97e05c09f624513b03bd3eb7663aa537&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7b92716c97e05c09f624513b03bd3eb7663aa537&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3504668" author="xgen-internal-githook" created="Wed, 25 Nov 2020 02:22:54 +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-51245&quot; title=&quot;Adapt resharding&amp;#39;s oplog fetcher to use the `Shard` interface for running commands&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51245&quot;&gt;&lt;del&gt;SERVER-51245&lt;/del&gt;&lt;/a&gt;: Have resharding oplog fetching use a Fetcher.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cda3a52701fe4143b06bd981b98514e69d0a93eb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cda3a52701fe4143b06bd981b98514e69d0a93eb&lt;/a&gt;&lt;/p&gt;</comment>
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