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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>[SERVER-36988] awaitdata_getmore_cmd.js times out when run concurrently with the LogicalSessionCache refresh suite</title>
                <link>https://jira.mongodb.org/browse/SERVER-36988</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://evergreen.mongodb.com/task/mongodb_mongo_master_enterprise_rhel_62_64_bit_logical_session_cache_refresh_jscore_passthrough_100_patch_23794c14b03bb272daad7a2b25eca0b80c03a31c_5b8ec487c9ec44355cfd6bae_18_09_04_17_46_37##%257B%2522compare%2522%253A%255B%257B%2522hash%2522%253A%252223794c14b03bb272daad7a2b25eca0b80c03a31c%2522%257D%255D%257D&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;awaitdata_getmore_cmd.js consistently stalls&lt;/a&gt; when run concurrently with a LogicalSessionCache refresh of 100ms. &lt;/p&gt;

&lt;p&gt;Further investigation to follow. This is a placeholder ticket to track the fix for a future blacklist on LogicalSessionCache refresh suites.&lt;/p&gt;

&lt;h2&gt;&lt;a name=&quot;Investigation&quot;&gt;&lt;/a&gt;Investigation&lt;/h2&gt;
&lt;p&gt;A couple things are happening here:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;awaitdata_getmore_cmd.js &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.1.3/jstests/core/awaitdata_getmore_cmd.js#L133&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;tails the oplog and issues getMores against it&lt;/a&gt;. When it does so, it waits until the cursor&apos;s batch size is equal to zero.&lt;/li&gt;
	&lt;li&gt;CheckReplDBHashInBackground continually runs and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7c13a75b928ace3f65c9553352689dc0a6d0ca83/jstests/hooks/run_check_repl_dbhash_background.js#L64&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;creates sessions&lt;/a&gt; to check db hashes.&lt;/li&gt;
	&lt;li&gt;The logical session cache &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7c13a75b928ace3f65c9553352689dc0a6d0ca83/src/mongo/db/logical_session_cache_impl.cpp#L343&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;refresh&lt;/a&gt; will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7c13a75b928ace3f65c9553352689dc0a6d0ca83/src/mongo/db/sessions_collection.cpp#L213&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;flush these sessions to disk&lt;/a&gt;, creating new oplog entries.&lt;/li&gt;
	&lt;li&gt;The getMore batch size will never be equal to zero in more aggressive (faster refresh &amp;#8211; 100ms is fastest) logical session cache suites.&lt;/li&gt;
	&lt;li&gt;The while loop will run indefinitely until the rare condition where the cursor is able to pull an empty batch before CheckReplDBHashInBackground can add a new session.&lt;/li&gt;
&lt;/ol&gt;


&lt;h2&gt;&lt;a name=&quot;ProposedFix&quot;&gt;&lt;/a&gt;Proposed Fix&lt;/h2&gt;
&lt;p&gt;The test expects an exact number. Relaxing the constraints would risk correctness on other suites. Unless it would make sense to conditionally run the while loop only if the logical session cache isn&apos;t running, then we should blacklist this test from logical session cache suites.&lt;/p&gt;</description>
                <environment></environment>
        <key id="599518">SERVER-36988</key>
            <summary>awaitdata_getmore_cmd.js times out when run concurrently with the LogicalSessionCache refresh suite</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="blake.oler@mongodb.com">Blake Oler</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                    </labels>
                <created>Tue, 4 Sep 2018 22:12:16 +0000</created>
                <updated>Sun, 29 Oct 2023 22:28:27 +0000</updated>
                            <resolved>Wed, 26 Sep 2018 20:01:02 +0000</resolved>
                                    <version>4.1.2</version>
                                    <fixVersion>3.6.9</fixVersion>
                    <fixVersion>4.0.4</fixVersion>
                    <fixVersion>4.1.4</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2015447" author="xgen-internal-githook" created="Wed, 26 Sep 2018 20:00:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Blake Oler&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36988&quot; title=&quot;awaitdata_getmore_cmd.js times out when run concurrently with the LogicalSessionCache refresh suite&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36988&quot;&gt;&lt;del&gt;SERVER-36988&lt;/del&gt;&lt;/a&gt; Blacklist awaitdata_getmore_cmd.js from logical session cache suites&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e983b5097788f02d3ef0b187d48d086d853c8769&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e983b5097788f02d3ef0b187d48d086d853c8769&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2014060" author="misha.tyulenev" created="Tue, 25 Sep 2018 20:28:25 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=blake.oler&quot; class=&quot;user-hover&quot; rel=&quot;blake.oler&quot;&gt;blake.oler&lt;/a&gt; Agreed. Interesting cycle!&lt;/p&gt;</comment>
                            <comment id="2014046" author="blake.oler" created="Tue, 25 Sep 2018 20:17:45 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=misha.tyulenev&quot; class=&quot;user-hover&quot; rel=&quot;misha.tyulenev&quot;&gt;misha.tyulenev&lt;/a&gt; ack?&lt;/p&gt;</comment>
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