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    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-68628] Retrying a failed resharding operation after a primary failover can lead to server crash or lost writes</title>
                <link>https://jira.mongodb.org/browse/SERVER-68628</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;While a resharding operation is ongoing, every write to the collection being resharded is amplified to a &quot;db.system.resharding.&amp;lt;uuid&amp;gt;&quot; sharded collection (aka temporary resharding collection). This is in part achieved by having ShardingWriteRouter::getReshardingDestinedRecipient() fill in a &quot;destinedRecipient&quot; field into the oplog entries for the inserts, updates, and deletes on the collection being resharded so these oplog entries can be later fetched by the appropriate recipient shard. &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r5.0.10/src/mongo/db/s/sharding_write_router.cpp#L57-L58&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ShardingWriteRouter calls CatalogCache::getCollectionRoutingInfo()&lt;/a&gt; to make this routing decision rather than CatalogCache::getCollectionRoutingInfoWithRefresh(). This is safe if the primary of the donor shard hasn&apos;t changed because &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r5.0.10/src/mongo/db/s/resharding/resharding_donor_service.cpp#L569&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;it will have already refreshed the routing information for the temporary resharding collection earlier&lt;/a&gt;. However, if a new primary of the donor shard has been elected then the routing information for the temporary resharding collection may be arbitrarily stale. The routing information being stale is problematic for a couple reasons:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;If the routing information for the temporary resharding collection says the collection is unsharded, then &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r5.0.10/src/mongo/db/s/sharding_write_router.cpp#L82&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ShardingWriteRouter calling ChunkManager::findIntersectingChunkWithSimpleCollation() will result in a segmentation fault&lt;/a&gt;.&lt;/li&gt;
	&lt;li&gt;If the routing information for the temporary resharding collection represents the chunk distribution from a prior resharding attempt, then the recipient shards may miss applying oplog entries and not end up consistent with the collection being resharded.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Running &lt;a href=&quot;https://www.mongodb.com/docs/manual/reference/command/flushRouterConfig/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the flushRouterConfig command&lt;/a&gt; on all mongod &amp;#45;&amp;#45;shardsvr processes before re&amp;#45;attempting a failed resharding operation will prevent the routing information for the temporary resharding collection from being stale.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2108426">SERVER-68628</key>
            <summary>Retrying a failed resharding operation after a primary failover can lead to server crash or lost writes</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="max.hirschhorn@mongodb.com">Max Hirschhorn</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                            <label>sharding-nyc-subteam1</label>
                    </labels>
                <created>Mon, 8 Aug 2022 12:05:15 +0000</created>
                <updated>Sun, 29 Oct 2023 21:34:49 +0000</updated>
                            <resolved>Tue, 9 Aug 2022 16:46:56 +0000</resolved>
                                                    <fixVersion>5.0.11</fixVersion>
                    <fixVersion>6.0.2</fixVersion>
                    <fixVersion>6.1.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4738244" author="max.hirschhorn@10gen.com" created="Tue, 9 Aug 2022 16:45:57 +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-68628&quot; title=&quot;Retrying a failed resharding operation after a primary failover can lead to server crash or lost writes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68628&quot;&gt;&lt;del&gt;SERVER-68628&lt;/del&gt;&lt;/a&gt; Refresh routing info on primary during resharding.&lt;/p&gt;

&lt;p&gt;The primary of a replica set shard may otherwise have arbitrarily stale&lt;br/&gt;
routing information for the source collection and temporary resharding&lt;br/&gt;
collection based on the time of its last refresh.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit eda2f5d5d94ef0e7ec8016e5b9cad00d746f1787)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8e55aa4ae2719be344a689a678f96531d4f82629&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8e55aa4ae2719be344a689a678f96531d4f82629&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4738191" author="xgen-internal-githook" created="Tue, 9 Aug 2022 16:29:37 +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-68628&quot; title=&quot;Retrying a failed resharding operation after a primary failover can lead to server crash or lost writes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68628&quot;&gt;&lt;del&gt;SERVER-68628&lt;/del&gt;&lt;/a&gt; Refresh routing info on primary during resharding.&lt;/p&gt;

&lt;p&gt;The primary of a replica set shard may otherwise have arbitrarily stale&lt;br/&gt;
routing information for the source collection and temporary resharding&lt;br/&gt;
collection based on the time of its last refresh.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit eda2f5d5d94ef0e7ec8016e5b9cad00d746f1787)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6f918f3fed2333aa3d1ac213bd8176743a733895&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6f918f3fed2333aa3d1ac213bd8176743a733895&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4736116" author="xgen-internal-githook" created="Mon, 8 Aug 2022 20:49:10 +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-68628&quot; title=&quot;Retrying a failed resharding operation after a primary failover can lead to server crash or lost writes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68628&quot;&gt;&lt;del&gt;SERVER-68628&lt;/del&gt;&lt;/a&gt; Refresh routing info on primary during resharding.&lt;/p&gt;

&lt;p&gt;The primary of a replica set shard may otherwise have arbitrarily stale&lt;br/&gt;
routing information for the source collection and temporary resharding&lt;br/&gt;
collection based on the time of its last refresh.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/eda2f5d5d94ef0e7ec8016e5b9cad00d746f1787&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/eda2f5d5d94ef0e7ec8016e5b9cad00d746f1787&lt;/a&gt;&lt;/p&gt;</comment>
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