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        <build-number>970001</build-number>
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            <title>[DOCS-6286] Make it clear that w:0 does not work sharded since 2.6</title>
                <link>https://jira.mongodb.org/browse/DOCS-6286</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;&lt;a href=&quot;http://docs.mongodb.org/manual/reference/write-concern/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/reference/write-concern/&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Due to the write API rework in 2.6, mongos does not support or propagate operations with a write concern of 0 (unacknowledged). Naturally, this hurts performance when switching from pre-2.6 or a replica set to a sharded cluster. &lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=barrie&quot; class=&quot;user-hover&quot; rel=&quot;barrie&quot;&gt;barrie&lt;/a&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=behackett&quot; class=&quot;user-hover&quot; rel=&quot;behackett&quot;&gt;behackett&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jeff.yemin&quot; class=&quot;user-hover&quot; rel=&quot;jeff.yemin&quot;&gt;jeff.yemin&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sam.weaver&quot; class=&quot;user-hover&quot; rel=&quot;sam.weaver&quot;&gt;sam.weaver&lt;/a&gt;This should probably be clearly documented in the driver documentation if not entirely disallowed.It&apos;s really easy to use w:0  against a sharded cluster and not realize it&apos;s not the same. &lt;/p&gt;</description>
                <environment></environment>
        <key id="231758">DOCS-6286</key>
            <summary>Make it clear that w:0 does not work sharded since 2.6</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="osmar.olivo">Osmar Olivo</reporter>
                        <labels>
                    </labels>
                <created>Mon, 28 Sep 2015 15:16:40 +0000</created>
                <updated>Mon, 30 Oct 2023 21:41:13 +0000</updated>
                            <resolved>Tue, 1 Nov 2022 11:01:36 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="4943603" author="edu.bot" created="Tue, 1 Nov 2022 11:01:33 +0000"  >&lt;p&gt;Hello! This ticket has been closed due to inactivity. If you believe this ticket is still important, please reopen it and leave a comment to explain why. Thank you!&lt;/p&gt;</comment>
                            <comment id="1045060" author="osmar.olivo@10gen.com" created="Mon, 28 Sep 2015 16:50:00 +0000"  >&lt;p&gt;By disallow I meant only in the case of sharded clusters. Documenting it in the function description is probably the best approach for maintaining backwards compatibility I agree.&lt;/p&gt;</comment>
                            <comment id="1045020" author="jeff.yemin" created="Mon, 28 Sep 2015 16:11:13 +0000"  >&lt;p&gt;Disallowing it would be a significant break in backwards compatibility.  We shouldn&apos;t do that lightly.&lt;/p&gt;</comment>
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