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    <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-34636] enable session_asio opportunistic writes with ssl</title>
                <link>https://jira.mongodb.org/browse/SERVER-34636</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We disabled opportunistic write for TLS in session_asio when we dropped the implementation in because it didn&apos;t work.  specifically, we&apos;re talking about setting the socket to non-blocking, then doing a write which would block in the tcp send.&lt;/p&gt;

&lt;p&gt;The core of the problem was that asio had no way of forcing the rest of the low level send, because it only had an opportunity to do work when asked to do a write (which worked or not for it&apos;s own reasons, generally the size of the openssl buffer being used for encryption).  The fix is to expose the unsent buffer in the event of socket failure, and finish the work ourselves with direct calls to write the underlying buffer.&lt;/p&gt;</description>
                <environment></environment>
        <key id="533227">SERVER-34636</key>
            <summary>enable session_asio opportunistic writes with ssl</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="13201">Fixed</resolution>
                                        <assignee username="mira.carey@mongodb.com">Mira Carey</assignee>
                                    <reporter username="mira.carey@mongodb.com">Mira Carey</reporter>
                        <labels>
                    </labels>
                <created>Tue, 24 Apr 2018 15:23:04 +0000</created>
                <updated>Sun, 29 Oct 2023 22:32:27 +0000</updated>
                            <resolved>Thu, 26 Apr 2018 18:10:51 +0000</resolved>
                                                    <fixVersion>4.0.0-rc0</fixVersion>
                                    <component>Networking</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1875299" author="xgen-internal-githook" created="Thu, 26 Apr 2018 18:09:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;jcarey@argv.me&apos;, &apos;username&apos;: &apos;hanumantmk&apos;, &apos;name&apos;: &apos;Jason Carey&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34636&quot; title=&quot;enable session_asio opportunistic writes with ssl&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34636&quot;&gt;&lt;del&gt;SERVER-34636&lt;/del&gt;&lt;/a&gt; enable opportunistic writes with ssl&lt;/p&gt;

&lt;p&gt;Add a side channel to the asio ssl streams which allows us to capture&lt;br/&gt;
the work remaining for the tcp send in the event of a full send buffer.&lt;/p&gt;

&lt;p&gt;This makes opportunistic writes safe for ssl sockets&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5156e623fd7dba3b4964ce1ba80a847b622b15df&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5156e623fd7dba3b4964ce1ba80a847b622b15df&lt;/a&gt;&lt;/p&gt;</comment>
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