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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-2119] In a chunk migration, TO-side shard can&apos;t commit before pushing chunk writes to secondary</title>
                <link>https://jira.mongodb.org/browse/SERVER-2119</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;db/repl_block.h  opReplicatedEnough has to be called in _recvChunkCommit&lt;/p&gt;

&lt;p&gt;Here&apos;s a race:&lt;/p&gt;

&lt;p&gt;&amp;gt; 0) TO-Primary receives last mods for a transfered chunk&lt;br/&gt;
&amp;gt; 1) FROM-Primary initiates chunk migration commit calling&lt;br/&gt;
&amp;gt; _recvChunkCommit on TO-Primary&lt;br/&gt;
&amp;gt; 2) TO-Primary acks it but TO-Secondary hasn&apos;t caught up&lt;br/&gt;
&amp;gt; 3) FROM-Primary updates config&lt;br/&gt;
&amp;gt; 4) TO-Primary dies&lt;br/&gt;
&amp;gt; 5) TO-Secondary takes over but it doesn&apos;t know about last mods&lt;/p&gt;
</description>
                <environment></environment>
        <key id="13734">SERVER-2119</key>
            <summary>In a chunk migration, TO-side shard can&apos;t commit before pushing chunk writes to secondary</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="9">Done</resolution>
                                        <assignee username="alerner">Alberto Lerner</assignee>
                                    <reporter username="alerner">Alberto Lerner</reporter>
                        <labels>
                    </labels>
                <created>Thu, 18 Nov 2010 17:36:33 +0000</created>
                <updated>Tue, 12 Jul 2016 00:19:37 +0000</updated>
                            <resolved>Fri, 17 Dec 2010 02:25:19 +0000</resolved>
                                                    <fixVersion>1.7.4</fixVersion>
                                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="21457" author="auto" created="Wed, 15 Dec 2010 22:28:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;alerner&apos;, u&apos;name&apos;: u&apos;Alberto Lerner&apos;, u&apos;email&apos;: u&apos;alerner@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2119&quot; title=&quot;In a chunk migration, TO-side shard can&amp;#39;t commit before pushing chunk writes to secondary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2119&quot;&gt;&lt;del&gt;SERVER-2119&lt;/del&gt;&lt;/a&gt; push migrated chunk data to secondary/journal at migrate commit&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2325d9c61a59fcbcdd5d981700a7fd1a64f5d4ca&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2325d9c61a59fcbcdd5d981700a7fd1a64f5d4ca&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="21456" author="auto" created="Wed, 15 Dec 2010 21:55:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;alerner&apos;, u&apos;name&apos;: u&apos;Alberto Lerner&apos;, u&apos;email&apos;: u&apos;alerner@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2119&quot; title=&quot;In a chunk migration, TO-side shard can&amp;#39;t commit before pushing chunk writes to secondary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2119&quot;&gt;&lt;del&gt;SERVER-2119&lt;/del&gt;&lt;/a&gt; expose the number of known slaves&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/057443fa137c87d950b92070213a753b975abbac&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/057443fa137c87d950b92070213a753b975abbac&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="20881" author="hampusw" created="Wed, 1 Dec 2010 12:37:09 +0000"  >&lt;p&gt;Just want to add that if the TO-side shard is a replica set, then it probably should wait for it to replicate to a majority of the members in that replica set (ie possibly more than one other server). It&apos;s not good if data that has once been safely written to a majority of servers in a replica set suddenly ends up on only a minority (in another shard) and thus risks getting lost on a failover!&lt;/p&gt;</comment>
                            <comment id="20437" author="auto" created="Thu, 18 Nov 2010 17:39:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;alerner&apos;, &apos;name&apos;: &apos;Alberto Lerner&apos;, &apos;email&apos;: &apos;alerner@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2119&quot; title=&quot;In a chunk migration, TO-side shard can&amp;#39;t commit before pushing chunk writes to secondary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2119&quot;&gt;&lt;del&gt;SERVER-2119&lt;/del&gt;&lt;/a&gt; Just to tie code site and JIRA item&lt;br/&gt;
/mongodb/mongo/commit/2478a98d7992a79b783250efe64647d8fd1374cf&lt;/p&gt;</comment>
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