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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-39934] CurOp::completeAndLogOperation should not hang waiting for global lock</title>
                <link>https://jira.mongodb.org/browse/SERVER-39934</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When logging a command (either slow or when forced logging is enabled) CurOp::completeAndLogOperation attempts to take a global lock to obtain storage statistics.  If something else has a Global X lock (or an enqueued Global X lock), this lock acquisition will stall behind that operation.  This introduces an undesirable dependency on the global lock for otherwise lock-free operations such as $currentOp.&lt;/p&gt;

&lt;p&gt;We should give this acquisition a very short deadline and elide the storage stats when it is not available.&lt;/p&gt;</description>
                <environment></environment>
        <key id="707700">SERVER-39934</key>
            <summary>CurOp::completeAndLogOperation should not hang waiting for global lock</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="sulabh.mahajan@mongodb.com">Sulabh Mahajan</assignee>
                                    <reporter username="matthew.russotto@mongodb.com">Matthew Russotto</reporter>
                        <labels>
                    </labels>
                <created>Fri, 1 Mar 2019 22:08:08 +0000</created>
                <updated>Sun, 29 Oct 2023 22:23:20 +0000</updated>
                            <resolved>Thu, 21 Mar 2019 05:32:41 +0000</resolved>
                                                    <fixVersion>4.0.9</fixVersion>
                    <fixVersion>4.1.10</fixVersion>
                                    <component>Concurrency</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="2200019" author="xgen-internal-githook" created="Wed, 3 Apr 2019 00:32:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;sulabh.mahajan@mongodb.com&apos;, &apos;name&apos;: &apos;Sulabh Mahajan&apos;, &apos;username&apos;: &apos;sulabhM&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38239&quot; title=&quot;Define and Implement getOperationStatistics of storage interface&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38239&quot;&gt;&lt;del&gt;SERVER-38239&lt;/del&gt;&lt;/a&gt; Added getOperationStatistics() API to fetch storage stats from WiredTiger&lt;/p&gt;

&lt;p&gt;(cherry picked from commit ba3894493a94ed3c18458f391ff181d57475f010)&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38240&quot; title=&quot;Extend OpDebug object to support storage statistics &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38240&quot;&gt;&lt;del&gt;SERVER-38240&lt;/del&gt;&lt;/a&gt; Added storage statistics information into the slowop log messages.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 86b6aca9fa1940e85bba87261d1494ef2c208a4a)&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38240&quot; title=&quot;Extend OpDebug object to support storage statistics &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38240&quot;&gt;&lt;del&gt;SERVER-38240&lt;/del&gt;&lt;/a&gt; work around uint64_t conversion on s390x in WiredTigerOperationStats::fetchStats()&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 82161eec79fc74652dc07b1c83fe500dc4f95e79)&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38243&quot; title=&quot;Test session storage statistics are part of slow operation report&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38243&quot;&gt;&lt;del&gt;SERVER-38243&lt;/del&gt;&lt;/a&gt; Test presence of the storage stats in slowop logs and system.profile.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 3b4c6a689a3fdaa923d427ae112ea599513ef8ce)&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39026&quot; title=&quot;Use correct type for retrieving WiredTiger statistics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39026&quot;&gt;&lt;del&gt;SERVER-39026&lt;/del&gt;&lt;/a&gt; Use correct type for retrieving WiredTiger stats&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 6a9a5855048df1f4796a4032276d01318c398691)&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39488&quot; title=&quot;Test does not see the storage statistics in the profiled output .&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39488&quot;&gt;&lt;del&gt;SERVER-39488&lt;/del&gt;&lt;/a&gt; Look for storage stats in the find command&apos;s profiled entry.&lt;/p&gt;

&lt;p&gt;The find command will always have the storage stats because the&lt;br/&gt;
test has created a collection with btree spanning multiple pages. Scanning&lt;br/&gt;
this collection after a server restart will trigger read from the disk&lt;br/&gt;
and have the disk read stats.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 6125b5fb078a316854f0299b96b7d16eacb944de)&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39361&quot; title=&quot;Synchronise collecting storage engine stats with shutdown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39361&quot;&gt;&lt;del&gt;SERVER-39361&lt;/del&gt;&lt;/a&gt; Synchronise collecting storage engine stats with shutdown&lt;/p&gt;

&lt;p&gt;(cherry picked from commit bacb6b67706a2c057fcd0f76a38f416b225aa69a)&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39061&quot; title=&quot;Fix the wt_operation_stats test to wait for the operation log to appear &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39061&quot;&gt;&lt;del&gt;SERVER-39061&lt;/del&gt;&lt;/a&gt; Fix the wt_operation_stats test to wait for the operation log to appear.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 371197e4bab715a83272a4472e118ee5c5cbbf7c)&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39934&quot; title=&quot;CurOp::completeAndLogOperation should not hang waiting for global lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39934&quot;&gt;&lt;del&gt;SERVER-39934&lt;/del&gt;&lt;/a&gt; Fix locking for slow ops storage stats&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39654&quot; title=&quot;Storage statistics not logged for a slow transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39654&quot;&gt;&lt;del&gt;SERVER-39654&lt;/del&gt;&lt;/a&gt; Make slow ops storage stats work with transactions&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 23ca771f76f85638f23bca2a4a6ac196a81fdc21)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/57edce7396271531dde4499458b22c9cde1f03d4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/57edce7396271531dde4499458b22c9cde1f03d4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2191298" author="sulabh.mahajan" created="Mon, 25 Mar 2019 22:42:06 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bruce.lucas&quot; class=&quot;user-hover&quot; rel=&quot;bruce.lucas&quot;&gt;bruce.lucas&lt;/a&gt;, this will impact slow operation logging and profiler. No impact to serverStatus.&lt;/p&gt;</comment>
                            <comment id="2190370" author="bruce.lucas@10gen.com" created="Mon, 25 Mar 2019 13:22:04 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sulabh.mahajan&quot; class=&quot;user-hover&quot; rel=&quot;sulabh.mahajan&quot;&gt;sulabh.mahajan&lt;/a&gt;, can you confirm that this impacts only currentOp and slow operation logging, and not serverStatus? I want to make sure we aren&apos;t doing anything that might create frequent schema changes in serverStatus, which would have a bad effect on ftdc compression efficiency.&lt;/p&gt;</comment>
                            <comment id="2187067" author="xgen-internal-githook" created="Thu, 21 Mar 2019 05:29:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;sulabh.mahajan@mongodb.com&apos;, &apos;name&apos;: &apos;Sulabh Mahajan&apos;, &apos;username&apos;: &apos;sulabhM&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39934&quot; title=&quot;CurOp::completeAndLogOperation should not hang waiting for global lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39934&quot;&gt;&lt;del&gt;SERVER-39934&lt;/del&gt;&lt;/a&gt; Fix locking for slow ops storage stats&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39654&quot; title=&quot;Storage statistics not logged for a slow transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39654&quot;&gt;&lt;del&gt;SERVER-39654&lt;/del&gt;&lt;/a&gt; Make slow ops storage stats work with transactions&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/23ca771f76f85638f23bca2a4a6ac196a81fdc21&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/23ca771f76f85638f23bca2a4a6ac196a81fdc21&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2171202" author="milkie" created="Tue, 5 Mar 2019 16:27:21 +0000"  >&lt;p&gt;Yeah, that tracker sounds better to use.&lt;/p&gt;</comment>
                            <comment id="2170876" author="matthew.russotto" created="Tue, 5 Mar 2019 13:55:53 +0000"  >&lt;p&gt;I believe lockerInfo won&apos;t tell you about locks which have been released, so you&apos;ll end up missing the storage engine stats more often than necessary.&lt;/p&gt;

&lt;p&gt;There&apos;s also the GlobalAcqusitionLockTracker, which tells if a global lock has ever been acquired in X, IX, or S (even if subsequently released); you could add IS to that and use it.&lt;/p&gt;</comment>
                            <comment id="2170867" author="milkie" created="Tue, 5 Mar 2019 13:47:53 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=matthew.russotto&quot; class=&quot;user-hover&quot; rel=&quot;matthew.russotto&quot;&gt;matthew.russotto&lt;/a&gt;, I don&apos;t think we should use the proposed solution for the problem as presented.  I believe if we remove the global lock acquisition for otherwise lock-free operations, that would solve your issue, correct?&lt;br/&gt;
I think we could do this by looking in the lockerInfo to see if the vector of locks has a size greater than 0.  If it is zero, we will skip fetching storage engine stats completely.&lt;/p&gt;</comment>
                            <comment id="2169593" author="bruce.lucas@10gen.com" created="Mon, 4 Mar 2019 17:23:37 +0000"  >&lt;p&gt;Can you clarify what user-visible content (e.g. log lines, currentOp output, serverStatus, FTDC output) is impacted, and what exactly &quot;storage stats&quot; refers to (ideally in terms of the affected user-visible artifacts)?&lt;/p&gt;</comment>
                            <comment id="2169532" author="thomas.schubert" created="Mon, 4 Mar 2019 17:03:24 +0000"  >&lt;p&gt;It&apos;s not ideal, especially since when things are slow that&apos;s generally when you most want diagnostics. But, I&apos;m not sure I have a better idea. It sounds like this is our &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39361?focusedCommentId=2159273&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-2159273&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;standard way of resolving this issue&lt;/a&gt; until PM-1242 lands. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bruce.lucas&quot; class=&quot;user-hover&quot; rel=&quot;bruce.lucas&quot;&gt;bruce.lucas&lt;/a&gt;,&#160;feel free to chime in if I&apos;m missing anything.&lt;/p&gt;</comment>
                            <comment id="2169404" author="judah.schvimer" created="Mon, 4 Mar 2019 16:14:09 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kelsey.schubert&quot; class=&quot;user-hover&quot; rel=&quot;kelsey.schubert&quot;&gt;kelsey.schubert&lt;/a&gt;, is this change acceptable?&lt;/p&gt;</comment>
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