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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-26120] Incompatible string conversion of floating point numbers in between different Windows builds</title>
                <link>https://jira.mongodb.org/browse/SERVER-26120</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It looks like 40000/12 when converted to string in v3.2 results to &quot;3333.333333333334&quot; while in master results to &quot;3333.333333333333&quot;. This causes some issues in sharding because the _id of config.chunks contains the string representation of the min value of that chunk.&lt;/p&gt;</description>
                <environment></environment>
        <key id="316312">SERVER-26120</key>
            <summary>Incompatible string conversion of floating point numbers in between different Windows builds</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="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Wed, 14 Sep 2016 23:28:03 +0000</created>
                <updated>Fri, 30 Sep 2016 18:28:01 +0000</updated>
                            <resolved>Fri, 30 Sep 2016 18:19:55 +0000</resolved>
                                    <version>3.3.12</version>
                                                                        <votes>1</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1397916" author="schwerin" created="Fri, 30 Sep 2016 18:19:55 +0000"  >&lt;p&gt;Outside of tests, shard version boundaries are not chosen by floating point division, so this should not affect production deployments. The `config.chunks` table is due for a redesign, and when we get to that, we can eliminate the stringified shard key index.&lt;/p&gt;</comment>
                            <comment id="1397839" author="renctan" created="Fri, 30 Sep 2016 17:33:26 +0000"  >&lt;p&gt;Yes. Unless the v3.2 nodes change their queries, they won&apos;t be able to modify the chunks with incompatible stringified _id that were given to them by a v3.4 shard.&lt;/p&gt;</comment>
                            <comment id="1397825" author="schwerin" created="Fri, 30 Sep 2016 17:26:45 +0000"  >&lt;p&gt;In what sense must this solution be backported to 3.2 for completeness? Are you considering mixed-mode operation during upgrade and downgrade?&lt;/p&gt;</comment>
                            <comment id="1396935" author="renctan" created="Thu, 29 Sep 2016 19:10:49 +0000"  >&lt;p&gt;&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; My proposal to workaround this bug is to change the query portion in applyOps (merge/split/moveChunk) to use { ns: xxx, min: yyy } instead of { _id: &quot;strigify xxx + yyy&quot; }. The update portion will also need to be tweaked to exclude the _id portion for basic updates but should be kept when doing upserts. This will require the fix to be backported to v3.2 as well to be complete. In this proposal, we will still continue on generating the _id as before but we will no longer use it in our queries. Assuming that v3.2 and v3.0 produce compatible strings, this change will not break compatibility between the 2 versions even when the workaround is backported to v3.2. However, this issue can manifest again if a v3.4 cluster is dowgraded down to v3.2.&lt;/p&gt;</comment>
                            <comment id="1384862" author="renctan" created="Wed, 14 Sep 2016 23:29:42 +0000"  >&lt;p&gt;Attached a test file that demonstrates the bug. Works perfectly fine on my Linux Mint machine, but fails on Windows build.&lt;/p&gt;</comment>
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                            <attachment id="138614" name="fp_error.js" size="889" author="randolph@mongodb.com" created="Wed, 14 Sep 2016 23:28:40 +0000"/>
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