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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[CDRIVER-2542] Investigate behavior of poll on zSeries</title>
                <link>https://jira.mongodb.org/browse/CDRIVER-2542</link>
                <project id="10030" key="CDRIVER">C Driver</project>
                    <description>&lt;p&gt;Tests for &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-1972&quot; title=&quot;Support IPv6 only hostnames&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-1972&quot;&gt;&lt;del&gt;CDRIVER-1972&lt;/del&gt;&lt;/a&gt; encountered some unexpected behavior of poll in zSeries.&lt;/p&gt;

&lt;p&gt;The test introduced a mock poll function. This called the library function &lt;tt&gt;poll&lt;/tt&gt; and sometimes would change the response. The tests would simulate a delayed connection by changing the response of poll to indicate no results. A consequence of this is that &lt;tt&gt;poll&lt;/tt&gt; could be called many more times than it would be in a normal case.&lt;/p&gt;

&lt;p&gt;Surprisingly, it seems like because of this mock poll, zSeries would occasionally have large delays (5 or 10 seconds). As a workaround, the timeout passed to poll was reduced to 5ms. We should investigate why this happened, and if there is a better solution.&lt;/p&gt;</description>
                <environment></environment>
        <key id="508862">CDRIVER-2542</key>
            <summary>Investigate behavior of poll on zSeries</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="13203">Gone away</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="kevin.albertson@mongodb.com">Kevin Albertson</reporter>
                        <labels>
                            <label>bgtrack</label>
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                <created>Fri, 9 Mar 2018 19:07:04 +0000</created>
                <updated>Fri, 27 Oct 2023 19:50:13 +0000</updated>
                            <resolved>Mon, 6 Mar 2023 15:46:29 +0000</resolved>
                                                                    <component>network</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5251991" author="kevin.albertson" created="Mon, 6 Mar 2023 15:46:29 +0000"  >&lt;p&gt;Mock server tests are no longer run on zSeries as of &lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/pull/1187&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/pull/1187&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1880915" author="kevin.albertson" created="Wed, 2 May 2018 19:54:17 +0000"  >&lt;p&gt;Example of spurious failure:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://evergreen.mongodb.com/task/mongo_c_driver_zseries_ubuntu1604_debug_compile_sasl_openssl_patch_9aadf541e08df23538a83e658645881468d23908_5ae3d1742fbabe28b037ea45_18_04_28_01_42_31&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://evergreen.mongodb.com/task/mongo_c_driver_zseries_ubuntu1604_debug_compile_sasl_openssl_patch_9aadf541e08df23538a83e658645881468d23908_5ae3d1742fbabe28b037ea45_18_04_28_01_42_31&lt;/a&gt;&lt;/p&gt;</comment>
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