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        <build-date>13-04-2023</build-date>
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            <title>[CDRIVER-136] Add tags to read preferences.</title>
                <link>https://jira.mongodb.org/browse/CDRIVER-136</link>
                <project id="10030" key="CDRIVER">C Driver</project>
                    <description></description>
                <environment></environment>
        <key id="38877">CDRIVER-136</key>
            <summary>Add tags to read preferences.</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>
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                                    <resolution id="9">Done</resolution>
                                        <assignee username="gregor">Gregor Macadam</assignee>
                                    <reporter username="kbanker">Kyle Banker</reporter>
                        <labels>
                    </labels>
                <created>Wed, 16 May 2012 18:05:03 +0000</created>
                <updated>Mon, 11 Nov 2013 20:48:09 +0000</updated>
                            <resolved>Mon, 11 Nov 2013 20:48:09 +0000</resolved>
                                                    <fixVersion>0.90.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="454620" author="christian.hergert@10gen.com" created="Mon, 11 Nov 2013 20:48:00 +0000"  >&lt;p&gt;The new C driver has support for tags in read preferences. For API use, see &lt;a href=&quot;https://github.com/chergert/libmongoc/blob/92dd66de4f80ede5b877239e0608a1d8e98564a8/mongoc/mongoc-read-prefs.h#L49&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/chergert/libmongoc/blob/92dd66de4f80ede5b877239e0608a1d8e98564a8/mongoc/mongoc-read-prefs.h#L49&lt;/a&gt;&lt;/p&gt;
</comment>
                            <comment id="153279" author="gjmurakami" created="Tue, 14 Aug 2012 16:14:57 +0000"  >&lt;p&gt;There are a couple of challenge for this issues.&lt;br/&gt;
1) test environment&lt;br/&gt;
    This requires setting up a replica set, to verify that the tagging is actually working.  There&apos;s no such facility for the C driver, and nothing has emerged as of yet from the other drivers, although this is a primary concern across the board.  It&apos;s likely that something will emerge with a server or HTTP REST interface, but this hasn&apos;t yet happened, its non-trivial and it&apos;s probably a prereq.&lt;br/&gt;
2) basic read prefernces&lt;br/&gt;
    The C driver yet support basic read preferences for replica sets (primary, secondary OK, secondary only, etc.).  This was the big push for the mainstream 2.2 drivers, but the C driver is of lower priority at present.  We should do basic read preference first, but keep tagging in mind.&lt;br/&gt;
3) API interface&lt;br/&gt;
    Both basic read preferences and tags will require an API change.  We should only have one API change if we can managed that, instead of two API changes.&lt;/p&gt;

&lt;p&gt;We should link this ticket and basic read preferences together.&lt;/p&gt;</comment>
                    </comments>
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