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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-44257] sharding/findandmodify2 needs to wait for enableAutosplit take effect on mongos</title>
                <link>https://jira.mongodb.org/browse/SERVER-44257</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The test exposes a race condition in sharding test where the enableAutosplit parameter &lt;a href=&quot;https://github.com/mongodb/mongo/blob/v4.2/src/mongo/shell/shardingtest.js#L224&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;updates the config database&lt;/a&gt; after the mongos has been started and hence it can miss the enableAutosplit value.&lt;/p&gt;

&lt;p&gt;This does not seem to be a serious issue but caused the BF-15172. To fix it may make sure that the autosplit is enabled in the sharding/findandmodify2.js test before running the workload&lt;/p&gt;</description>
                <environment></environment>
        <key id="979505">SERVER-44257</key>
            <summary>sharding/findandmodify2 needs to wait for enableAutosplit take effect on mongos</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="tommaso.tocci@mongodb.com">Tommaso Tocci</assignee>
                                    <reporter username="misha.tyulenev@mongodb.com">Misha Tyulenev</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Fri, 25 Oct 2019 20:30:41 +0000</created>
                <updated>Thu, 16 Apr 2020 12:39:34 +0000</updated>
                            <resolved>Thu, 16 Apr 2020 12:39:34 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3042342" author="tommaso.tocci" created="Thu, 16 Apr 2020 12:39:14 +0000"  >&lt;p&gt;As &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=misha.tyulenev&quot; class=&quot;user-hover&quot; rel=&quot;misha.tyulenev&quot;&gt;misha.tyulenev&lt;/a&gt; said, the problem is that ShardingTest is starting first the router then the config servers and then the shards. This means that when the mongos starts it doesn&apos;t know that the autosplit needs to be enabled and it will fetch that configuration parameter from the config server later on through the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/454e1823bbbe7cc25d6f34856913d8161d729e4b/src/mongo/s/sharding_uptime_reporter.cpp#L126&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;sharding uptime reporter thread&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;In 4.0 the autosplitter was operating on the mongos, on 4.2 on both mongos and the shards and as of 4.4, the autosplitter is operating only on the shards. This explain why this test failed just once in the 4.2 branch and only on the sharding_last_stable_mongos_and_mixed_shards suite. In fact in this specific scenario the router is running with v4.0 and is in charge for the autosplitting.&lt;/p&gt;

&lt;p&gt;Given that this issue:&lt;br/&gt;
&#160;- Doesn&apos;t affect any version grater then 4.0.&lt;br/&gt;
&#160;- Is not a problem on production system.&lt;br/&gt;
&#160;- There is not an easy fix for this and all the solution I discussed with&#160;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=matthew.saltz&quot; class=&quot;user-hover&quot; rel=&quot;matthew.saltz&quot;&gt;matthew.saltz&lt;/a&gt; required a lot of changes or dirty hacks.&lt;/p&gt;

&lt;p&gt;We decided not to fix this.&lt;/p&gt;</comment>
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