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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>[DOCS-14255] Clarification needed in doc regarding multi-shard transactions in a cluster contains arbiters.</title>
                <link>https://jira.mongodb.org/browse/DOCS-14255</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;
&lt;p&gt;Customer reported problems performing multi-shard transactions in a cluster that contains arbiters in the shards. This limitation is clearly mentioned in some sections of our documentation, eg &lt;a href=&quot;https://docs.mongodb.com/manual/core/transactions/#arbiters&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; which directly states:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Transactions whose write operations span multiple shards will error and abort if any transaction operation reads from or writes to a shard that contains an arbiter.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
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&lt;p/&gt;

&lt;p&gt;However, other sections of the documentation are much less clear on the matter. For example, customer linked &lt;a href=&quot;https://docs.mongodb.com/v4.2/reference/read-concern-majority/#disable-read-concern-majority&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this page&lt;/a&gt; which states:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;A transaction that writes to multiple shards errors if any of the transaction&#8217;s read or write operations involves a shard that has disabled read concern &quot;majority&quot;.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The above implies that such an operation (transaction writing to multiple shards) would be successful if read concern majority had not been disabled.&lt;/p&gt;

&lt;p&gt;I suggest that we specifically state out that the &quot;Transactions whose write operations span multiple shards will error and abort if any transaction operation reads from or writes to a shard that contains an arbiter.&quot; in the &lt;tt&gt;disable-read-concern-majority&lt;/tt&gt; part of the doc, to clarify the limitations.&lt;/p&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="1634401">DOCS-14255</key>
            <summary>Clarification needed in doc regarding multi-shard transactions in a cluster contains arbiters.</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="tom.li@mongodb.com">Tom Li</reporter>
                        <labels>
                    </labels>
                <created>Fri, 26 Feb 2021 01:01:44 +0000</created>
                <updated>Mon, 30 Oct 2023 20:11:47 +0000</updated>
                            <resolved>Tue, 4 Apr 2023 17:11:23 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due>Fri, 5 Mar 2021 00:00:00 +0000</due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5324005" author="JIRAUSER1264463" created="Tue, 4 Apr 2023 17:11:10 +0000"  >&lt;p&gt;Closing this out on the grounds that:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Details of this request are significantly outdated.&#160;&lt;/li&gt;
	&lt;li&gt;Our documentation has evolved substantially since this request was made.&#160;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Based on this, closing as WON&apos;T DO. Please don&apos;t hesitate to give me a shout or to reopen if you disagree.&lt;/p&gt;</comment>
                            <comment id="4758144" author="JIRAUSER1264463" created="Wed, 17 Aug 2022 17:14:50 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tom.li%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;tom.li@mongodb.com&quot;&gt;tom.li@mongodb.com&lt;/a&gt;, can you help me the the priority for this ticket? I am going to revert this to unassigned, as Andrew hasn&apos;t been here for a little while. The ticket will live in the Server team&apos;s bugfix backlog and someone will pick it up as time allows. If you think this needs a higher priority, please let me know and we can get this assigned accordingly.&#160;&lt;/p&gt;</comment>
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