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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-29547] make shell runCommand manually clean up partially written chunks after failed shardCollection in continuous config stepdown override</title>
                <link>https://jira.mongodb.org/browse/SERVER-29547</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Since we are moving shardCollection to the config server, and shardCollection is not idempotent in that:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;it writes chunks to config.chunks before it inserts an entry for the collection into config.collections&lt;/li&gt;
	&lt;li&gt;at the start of shardCollection, it fails if no entry for the collection exists in config.collections but there are chunks for the collection in config.chunks&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;and we have a continuous config stepdown suite, which can cause the shardCollection to fail mid-way and be retried from the start by mongos, we must add a workaround in the continuous stepdown suite override.&lt;/p&gt;

&lt;p&gt;The workaround should clean up partially written chunks and retry a failed shardCollection if it failed because it saw partially written chunks.&lt;/p&gt;

&lt;p&gt;Cons: We have to assume the partially written chunks were due to a config server stepdown, and if there was actually a bug, we will gloss over it by deleting the chunks and retrying.&lt;/p&gt;

&lt;p&gt;Pros: It allows us to have a config stepdown suite that uses all the existing jstests in jstests/sharding without modifying any of those tests. Since basically every test calls shardCollection, we can&apos;t get away with just blacklisting affected tests.&lt;/p&gt;

&lt;p&gt;Note: This was not an issue while shardCollection was on mongos, because we do not have a mongos stepdown suite; if there were config stepdowns during shardCollection, only a particular read or write from mongos to the config servers was retried (and DuplicateKeyError was handled gracefully by mongos).&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=max.hirschhorn&quot; class=&quot;user-hover&quot; rel=&quot;max.hirschhorn&quot;&gt;max.hirschhorn&lt;/a&gt;&lt;/p&gt;
</description>
                <environment></environment>
        <key id="392381">SERVER-29547</key>
            <summary>make shell runCommand manually clean up partially written chunks after failed shardCollection in continuous config stepdown override</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="esha.maharishi@mongodb.com">Esha Maharishi</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Fri, 9 Jun 2017 21:08:04 +0000</created>
                <updated>Mon, 30 Oct 2023 23:16:11 +0000</updated>
                            <resolved>Wed, 21 Jun 2017 13:07:25 +0000</resolved>
                                    <version>3.5.9</version>
                                    <fixVersion>3.5.9</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1602452" author="esha.maharishi@10gen.com" created="Wed, 21 Jun 2017 13:07:25 +0000"  >&lt;p&gt;Committed along with &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29107&quot; title=&quot;move shardCollection logic into new _configsvrShardCollection command on config server&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29107&quot;&gt;&lt;del&gt;SERVER-29107&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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