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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-31978] Add an invariant that DocumentSourceCloseCursor does not execute on a mongod for a sharded $changeStream</title>
                <link>https://jira.mongodb.org/browse/SERVER-31978</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;DocumentSourceCloseCursor is part of the internal $changeStream machinery. It is used to close change stream cursors that have been invalidated, due to an event such as a collection drop or database drop.&lt;/p&gt;

&lt;p&gt;DocumentSourceCloseCursor should always run on the mongos in the case that the $changeStream is run in a sharded configuration. This is because the mongos cursor manager is not prepared to correctly handle its child cursor being closed out from under it. Instead, the cursor should be closed via the DocumentSourceCloseCursor running on mongos. Cleanup of the mongos cursor should cause the underlying cursors on the shards to be cleaned up as well.&lt;/p&gt;

&lt;p&gt;As of commit &lt;a href=&quot;https://github.com/mongodb/mongo/commit/d4a526fdcfa3f740220940b8bf6767da959d4b3d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;d4a526fdcf&lt;/a&gt; under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30834&quot; title=&quot;Make mongos reload the shard registry and re-establish changeStream cursors when encountering a &amp;#39;retryNeeded&amp;#39; entry&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30834&quot;&gt;&lt;del&gt;SERVER-30834&lt;/del&gt;&lt;/a&gt;, $changeStream will never pass through completely to the shards. Therefore, the DocumentSourceCloseCursor should always end up on mongos. Since it is not obviously wrong to pass through the change stream, we should add an invariant to make sure that this doesn&apos;t regress.&lt;/p&gt;</description>
                <environment></environment>
        <key id="459133">SERVER-31978</key>
            <summary>Add an invariant that DocumentSourceCloseCursor does not execute on a mongod for a sharded $changeStream</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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Wed, 15 Nov 2017 15:33:15 +0000</created>
                <updated>Mon, 30 Oct 2023 23:10:31 +0000</updated>
                            <resolved>Mon, 20 Nov 2017 18:06:36 +0000</resolved>
                                                    <fixVersion>3.6.1</fixVersion>
                    <fixVersion>3.7.1</fixVersion>
                                    <component>Aggregation Framework</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="1744288" author="xgen-internal-githook" created="Wed, 6 Dec 2017 16:47:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;David Storch&apos;, &apos;username&apos;: &apos;dstorch&apos;, &apos;email&apos;: &apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31978&quot; title=&quot;Add an invariant that DocumentSourceCloseCursor does not execute on a mongod for a sharded $changeStream&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31978&quot;&gt;&lt;del&gt;SERVER-31978&lt;/del&gt;&lt;/a&gt; Add invariant that changeStream pipeline sent from mongos to mongod has been split.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 11c3a16c20532b77e6e8a2b45ddb18c45913699d)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7431c4c6d9cfb91d85259687966dea5b1a8f1435&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7431c4c6d9cfb91d85259687966dea5b1a8f1435&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1730593" author="xgen-internal-githook" created="Mon, 20 Nov 2017 18:03:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;David Storch&apos;, &apos;username&apos;: &apos;dstorch&apos;, &apos;email&apos;: &apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31978&quot; title=&quot;Add an invariant that DocumentSourceCloseCursor does not execute on a mongod for a sharded $changeStream&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31978&quot;&gt;&lt;del&gt;SERVER-31978&lt;/del&gt;&lt;/a&gt; Add invariant that changeStream pipeline sent from mongos to mongod has been split.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/11c3a16c20532b77e6e8a2b45ddb18c45913699d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/11c3a16c20532b77e6e8a2b45ddb18c45913699d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1726477" author="david.storch" created="Wed, 15 Nov 2017 15:35:23 +0000"  >&lt;p&gt;The problem with running DocumentSourceCloseCursors on mongod in sharding is subtle, and was exposed by our continuous integration testing. The problem is a race between the check for &lt;tt&gt;remotesExhausted()&lt;/tt&gt; and the awaitData timeout in &lt;tt&gt;RouterStageMerge&lt;/tt&gt;. I can reproduce reliably the failure at githash &lt;a href=&quot;https://github.com/mongodb/mongo/commit/f19da233faba9a42b7fbe84b38df7bb7f1a9e496&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;f19da233fa&lt;/a&gt; after applying the following patch:&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;
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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;  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;diff --git a/src/mongo/s/query/async_results_merger.cpp b/src/mongo/s/query/async_results_merger.cpp&lt;/span&gt;&lt;/pre&gt;
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					&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;index 45f4cbf350..358df1e3ad 100644&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;--- a/src/mongo/s/query/async_results_merger.cpp&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;+++ b/src/mongo/s/query/async_results_merger.cpp&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;@@ -538,6 +538,12 @@ void AsyncResultsMerger::_processBatchResults(WithLock lk,&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;     // Update the cursorId; it is sent as &apos;0&apos; when the cursor has been exhausted on the shard.&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;     remote.cursorId = cursorResponse.getCursorId();&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;&amp;nbsp;&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 (remote.cursorId == 0 &amp;amp;&amp;amp; _params-&amp;gt;tailableMode == TailableMode::kTailableAndAwaitData) {&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;+        log() &amp;lt;&amp;lt; &quot;AsyncResultsMerger()::_processBatchResults going to sleep&quot;;&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;+        sleepmillis(5000);&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;+        log() &amp;lt;&amp;lt; &quot;AsyncResultsMerger()::_processBatchResults woke up&quot;;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;+    }&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;
			&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;     // Save the batch in the remote&apos;s buffer.&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 (!_addBatchToBuffer(lk, remoteIndex, cursorResponse)) {&lt;/span&gt;&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;   margin-bottom: 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;&lt;/span&gt;&lt;/pre&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;This patch instruments the code with a sleep to induce the following sequence of events:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;The change stream is forwarded entirely to the shard using the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f19da233faba9a42b7fbe84b38df7bb7f1a9e496/src/mongo/s/commands/cluster_aggregate.cpp#L787&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;aggPassthrough()&lt;/a&gt; path. At this revision, the pipeline is never split. All of the change stream machinery ends up on the shard.&lt;/li&gt;
	&lt;li&gt;The test causes the shard to generate an invalidate entry and close its cursor. It sends back a batch with a single invalidate entry and a cursor id of zero.&lt;/li&gt;
	&lt;li&gt;The mongos processes the batch. It marks the remote cursor as closed by copying over the cursor id of zero &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f19da233faba9a42b7fbe84b38df7bb7f1a9e496/src/mongo/s/query/async_results_merger.cpp#L538-L539&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/li&gt;
	&lt;li&gt;Around the same time that the response batch is being handled on mongos, the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f19da233faba9a42b7fbe84b38df7bb7f1a9e496/src/mongo/s/query/router_stage_merge.cpp#L80-L88&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;awaitData timeout in RouterStageMerge&lt;/a&gt; expires. This causes &lt;tt&gt;RouterStageMerge&lt;/tt&gt; to propagate an EOF up through the layers of router stages inside the mongos cursor.&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;ClusterFind::runGetMore()&lt;/tt&gt; handles the EOF. Typically the mongos will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f19da233faba9a42b7fbe84b38df7bb7f1a9e496/src/mongo/s/query/cluster_find.cpp#L289&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;keep a tailable cursor open&lt;/a&gt; even when it is exhausted. However, you&apos;ll notice that this check marks a tailable mongos cursor as exhausted when the remote cursors on the shards are closed. Since the cursor has already been closed on the remote node due to the change stream invalidation, we mark the mongos cursor as exhausted. This causes us to fail to return the invalidate entry to the client.&lt;/li&gt;
&lt;/ol&gt;
</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="420385">SERVER-30834</issuekey>
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