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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-29961] Close change notification cursors when a chunk migrates to a new shard</title>
                <link>https://jira.mongodb.org/browse/SERVER-29961</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a new shard is added to the cluster, any existing change notification cursors won&apos;t have corresponding cursors on that shard, so if chunks migrate to that shard future updates to that data could be missed by existing change notification cursors.&lt;/p&gt;

&lt;p&gt;To protect against this, any time a shard donates a chunk to another shard, it will first check its copy of the routing table to determine if the destination shard has any chunks for that collection.  If not, then it will close all of its own change notification cursors on that collection.  This will cause the mongos to close its corresponding cluster change notification cursor, which will in turn cause the driver to retry the change notification request, at which point the new change notification cursor will target all existing shards and include the newly added shard&lt;/p&gt;</description>
                <environment></environment>
        <key id="400257">SERVER-29961</key>
            <summary>Close change notification cursors when a chunk migrates to a new shard</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="siyuan.zhou@mongodb.com">Siyuan Zhou</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Mon, 3 Jul 2017 17:40:07 +0000</created>
                <updated>Mon, 30 Oct 2023 23:15:30 +0000</updated>
                            <resolved>Wed, 13 Sep 2017 23:20:10 +0000</resolved>
                                                    <fixVersion>3.6.0-rc0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1672402" author="ramon.fernandez" created="Wed, 13 Sep 2017 22:11:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: u&apos;visualzhou&apos;, &apos;name&apos;: u&apos;Siyuan Zhou&apos;, &apos;email&apos;: u&apos;siyuan.zhou@mongodb.com&apos;}
&lt;p&gt;Message:&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29961&quot; title=&quot;Close change notification cursors when a chunk migrates to a new shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29961&quot;&gt;&lt;del&gt;SERVER-29961&lt;/del&gt;&lt;/a&gt; Close change notification cursors when a chunk migrates to a new shard&lt;br/&gt;
Branch:master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c1c269079f892c2b554491997eb6d9114d890838&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c1c269079f892c2b554491997eb6d9114d890838&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1656668" author="xgen-internal-githook" created="Thu, 24 Aug 2017 21:38:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;visualzhou&apos;, &apos;email&apos;: &apos;siyuan.zhou@mongodb.com&apos;, &apos;name&apos;: &apos;Siyuan Zhou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29961&quot; title=&quot;Close change notification cursors when a chunk migrates to a new shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29961&quot;&gt;&lt;del&gt;SERVER-29961&lt;/del&gt;&lt;/a&gt; Add OR BSON helper and use it for change streams.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7faaefa4975c2e3ec43e28e38028d9b5215e5978&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7faaefa4975c2e3ec43e28e38028d9b5215e5978&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1642391" author="siyuan.zhou@10gen.com" created="Mon, 7 Aug 2017 21:13:47 +0000"  >&lt;p&gt;Making the behavior work on secondaries is challenging because only the primary of the donor coordinates chuck migrations. Another subtle problem is when to close the cursor. If we don&apos;t close the cursor until the donor updates the routing table on the config server, there might be new updates on the recipient that will be missed when resuming with the resume token returned by the donor.&lt;/p&gt;

&lt;p&gt;As discussed with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=spencer&quot; class=&quot;user-hover&quot; rel=&quot;spencer&quot;&gt;spencer&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=schwerin&quot; class=&quot;user-hover&quot; rel=&quot;schwerin&quot;&gt;schwerin&lt;/a&gt;, we believe this issue will be fixed by two-phase commit since chunk migration will be a transaction involving the donor, the recipient and the config server. We will be able to close the cursor and return the resume token of the commit time.&lt;/p&gt;

&lt;p&gt;However, without two-phase commit in 3.6, we need to log a no-op message after entering the critical section and before updating the config server. Thus the cluster time of this no-op will be after the cluster time of adding a new shard and before the commit time of chunk migration on the config server due to causal consistency.&lt;/p&gt;

&lt;p&gt;The no-op message is only logged when the recipient doesn&apos;t have any data of the collection before. The proposed no-op message has the following format:&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;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;{&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;	&quot;op&quot; : &quot;n&quot;,&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;	&quot;o&quot; : {&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;
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&lt;p/&gt;

&lt;p&gt;For back-compatibility, we cannot use the &quot;ns&quot; field because it&apos;s &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.11/src/mongo/db/repl/sync_tail.cpp#L318&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;expected to be empty&lt;/a&gt; for no-ops.&lt;/p&gt;</comment>
                            <comment id="1630698" author="spencer" created="Mon, 24 Jul 2017 23:03:34 +0000"  >&lt;p&gt;The problem outlined in my last comment can be fixed by double-checking the set of all shards (by querying the config servers) after establishing cursors on all previously know-about shards, and retrying if any shards have been added.&lt;/p&gt;</comment>
                            <comment id="1613063" author="spencer" created="Mon, 3 Jul 2017 18:01:53 +0000"  >&lt;p&gt;On second thought this approach won&apos;t work.  There is a race where when establishing a new change notification cursor on a sharded collection a mongos could first get the list of all shards.  After getting that list, a shard could be added and a chunk migrated to that shard.  If it&#8217;s only after that point that the mongos goes on to establish cursors on all shards you can wind up in a state where there is a cursor on all shards but the new one, and the new shard already has a chunk so the system will never notice that it is missing notifications from that shard.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
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            <issuekey id="382757">SERVER-29143</issuekey>
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