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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>
    </build-info>


<item>
            <title>[SERVER-36441] Don&apos;t truncate &apos;comment&apos; command parameter in the slow query logs</title>
                <link>https://jira.mongodb.org/browse/SERVER-36441</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;b&gt;ISSUE DESCRIPTION&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Currently, the following behavior is observed for the $comment field displayed in the mongodb logs.&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;The $comment field&apos;s length gets truncated to 150 characters, when it is captured in the logs.&lt;/li&gt;
	&lt;li&gt;Increasing the value for maxLogSizeKB, makes no difference. The $comment field length still gets truncated in the logs at 150 characters.&lt;/li&gt;
&lt;/ul&gt;


&lt;hr /&gt;
&lt;p&gt;&lt;b&gt;REPRODUCER&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;1. The following command can be run in the &lt;em&gt;mongo shell&lt;/em&gt; - note the `AB` at the end of the $comment string:&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;
&lt;p/&gt;
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&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;replset:PRIMARY&amp;gt; db.&amp;lt;collectionName&amp;gt;.aggregate([ { $match: { $comment: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXAB&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;} } ])&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;2. In the logs it will be observed that the $comment field gets truncated (note the `...` and no `AB` at the end):&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;command test.&amp;lt;collectionName&amp;gt; appName: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;MongoDB Shell&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; command: aggregate { aggregate: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;&amp;lt;collectionName&amp;gt;&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;, pipeline: [ { $match: { $comment: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX...&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; } } ]&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;3. Performing a character count on the length of the $comment field (the &quot;XXXX...&quot;) will show they are `150 `characters.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;
&lt;hr /&gt;
&lt;p&gt;&lt;b&gt;FEATURE REQUEST&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;Requesting for a feature that allows for changing the length of the $comment field displayed in the logs.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="583224">SERVER-36441</key>
            <summary>Don&apos;t truncate &apos;comment&apos; command parameter in the slow query logs</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="harshad.dhavale@mongodb.com">Harshad Dhavale</reporter>
                        <labels>
                            <label>query-product-scope-1</label>
                            <label>query-product-urgency-3</label>
                            <label>query-product-value-3</label>
                    </labels>
                <created>Fri, 3 Aug 2018 18:34:56 +0000</created>
                <updated>Thu, 17 Aug 2023 20:37:23 +0000</updated>
                                                                            <component>Diagnostics</component>
                    <component>Querying</component>
                                        <votes>3</votes>
                                    <watches>20</watches>
                                                                                                                <comments>
                            <comment id="5641580" author="JIRAUSER1265607" created="Thu, 17 Aug 2023 20:37:12 +0000"  >&lt;p&gt;Product triage: the value and urgency are low. Sending it to backlog.&#160;&lt;/p&gt;</comment>
                            <comment id="5632209" author="JIRAUSER1257467" created="Mon, 14 Aug 2023 14:16:29 +0000"  >&lt;p&gt;Passing to Product to decide on priority&lt;/p&gt;</comment>
                            <comment id="2199378" author="acm" created="Tue, 2 Apr 2019 17:06:20 +0000"  >&lt;p&gt;I would definitely agree that introducing knowledge of &lt;tt&gt;comment&lt;/tt&gt; and &lt;tt&gt;$comment&lt;/tt&gt; into the BSON library is a layer violation. I do worry about adding yet another parameter to &lt;tt&gt;BSONObj::toString&lt;/tt&gt; and &lt;tt&gt;BSONElement::toString&lt;/tt&gt; (the latter being where the limit is actually enforced). There are already too many options. Another concern is whether the &lt;tt&gt;alwaysFull&lt;/tt&gt; set would eventually come to include dotted paths, which would be another layer violation, I think. This discussion has me once again wishing that we had a generic BSON visitation framework. That would allow customization of behavior at the point of use, rather than plumbing additional context into the heavily overworked &lt;tt&gt;::toString&lt;/tt&gt; methods. However, the visitor would need to be implemented without stack based recursion, making it somewhat tricky to implement.&lt;/p&gt;</comment>
                            <comment id="2195472" author="bartle" created="Fri, 29 Mar 2019 02:35:22 +0000"  >&lt;p&gt;I&apos;d be fine adding a &quot;&lt;tt&gt;const set&amp;lt;string&amp;gt;&amp;amp; alwaysFull&lt;/tt&gt;&quot; argument to &lt;tt&gt;toString&lt;/tt&gt;, or even just a string argument &lt;tt&gt;topLevelAlwaysFull&lt;/tt&gt; if we only want to support &quot;comment&quot; (depending on how &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29794&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-29794&lt;/a&gt; turns out).&lt;/p&gt;</comment>
                            <comment id="2195386" author="david.storch" created="Thu, 28 Mar 2019 22:54:02 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bartle&quot; class=&quot;user-hover&quot; rel=&quot;bartle&quot;&gt;bartle&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for looking into this! I&apos;d be a bit worried about writing code deep in the BSONObj library that has logic specific to &quot;comment&quot; or &quot;$comment&quot;. The BSONObj code itself should be agnostic as to what its contents are in order to present a generic interface to all callers. I think a preferable approach would be to add a new parameter to BSONObj::toString() so that the caller can describe which fields should not be truncated. My team doesn&apos;t actually own this code, so I&apos;m not sure if &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=acm&quot; class=&quot;user-hover&quot; rel=&quot;acm&quot;&gt;acm&lt;/a&gt; has different thoughts on how we should achieve this. Once we agree on the broad strokes of the fix, a pull request would be awesome!&lt;/p&gt;

&lt;p&gt;Best,&lt;br/&gt;
Dave&lt;/p&gt;</comment>
                            <comment id="2188304" author="bartle" created="Fri, 22 Mar 2019 06:14:33 +0000"  >&lt;p&gt;The following simple patch fixes this (verified against 3.4):&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;diff --git a/src/mongo/bson/bsonobj.cpp b/src/mongo/bson/bsonobj.cpp&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;index bc0045f568..2a048c26f9 &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;100644&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;--- a/src/mongo/bson/bsonobj.cpp&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;+++ b/src/mongo/bson/bsonobj.cpp&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;@@ -&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;612&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;,&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;7&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; +&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;612&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;,&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; @@ &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;void&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; BSONObj::toString(&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;         &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;else&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;             s &amp;lt;&amp;lt; &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;, &quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;;&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-        e.toString(s, !isArray, full, redactValues, depth);&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;+        &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;if&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; (!full &amp;amp;&amp;amp; !isArray &amp;amp;&amp;amp; (str::equals(e.fieldName(), &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;comment&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;) || str::equals(e.fieldName(), &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;$comment&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;)))&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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&lt;p/&gt;
&lt;p&gt;If this seems like a reasonable approach, I can add some tests and send out a PR.&lt;/p&gt;</comment>
                            <comment id="2188271" author="bartle" created="Fri, 22 Mar 2019 02:51:16 +0000"  >&lt;p&gt;I think this is a bit more difficult to change now, since logs are now run through output redaction first.&#160; In&#160;&lt;tt&gt;OpDebug::report&lt;/tt&gt; we may just want to iterate over &lt;tt&gt;query&lt;/tt&gt;&#160;and/or &lt;tt&gt;cmdToLog.getObject()&lt;/tt&gt;,&#160;looking for top-level &lt;tt&gt;comment&lt;/tt&gt; fields, and for those, ultimately call &lt;tt&gt;toString&lt;/tt&gt; with &lt;tt&gt;full=true&lt;/tt&gt;?&lt;/p&gt;</comment>
                            <comment id="2107652" author="asya" created="Mon, 7 Jan 2019 19:50:33 +0000"  >&lt;p&gt;This ticket tracks two related issues:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;when log line exceeds the maximum the entire comment can be lost/missing&lt;/li&gt;
	&lt;li&gt;when log line does not exceed maximum the comment still gets truncated&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="1995584" author="harshad.dhavale" created="Thu, 6 Sep 2018 18:59:35 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.storch&quot; class=&quot;user-hover&quot; rel=&quot;david.storch&quot;&gt;david.storch&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for the detailed explanation of why the comment field gets truncated at 150 characters and the related details. That makes sense. A fix for the &lt;em&gt;comment&lt;/em&gt; &lt;em&gt;parameter&lt;/em&gt; (instead of &lt;em&gt;$comment&lt;/em&gt;) would definitely help as well, cause it will help achieve the end-goal of recording the full comment-string in the logs.&lt;/p&gt;

&lt;p&gt;Thanks again.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Harshad&lt;/p&gt;</comment>
                            <comment id="1995431" author="david.storch" created="Thu, 6 Sep 2018 17:27:52 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=harshad.dhavale&quot; class=&quot;user-hover&quot; rel=&quot;harshad.dhavale&quot;&gt;harshad.dhavale&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for the improvement request. We made a similar improvement to the output of &lt;tt&gt;$currentOp&lt;/tt&gt; under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27439&quot; title=&quot;Large queries can omit comment in currentOp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27439&quot;&gt;&lt;del&gt;SERVER-27439&lt;/del&gt;&lt;/a&gt;, but these changes did not apply to the slow query log. Note that we also improved the aggregate command to accept a top-level comment parameter (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28128&quot; title=&quot;Add support for a &amp;quot;comment&amp;quot; parameter to the aggregate command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28128&quot;&gt;&lt;del&gt;SERVER-28128&lt;/del&gt;&lt;/a&gt;).&lt;/p&gt;

&lt;p&gt;When we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/dfca02c17d430b7b983157154055a58939b22372/src/mongo/db/curop.cpp#L518-L538&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;log CurOp::_opDescription&lt;/a&gt;, we end up invoking &lt;a href=&quot;https://github.com/mongodb/mongo/blob/dfca02c17d430b7b983157154055a58939b22372/src/mongo/bson/bsonobj.h#L582&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;BSONObj&apos;s operator&amp;lt;&amp;lt; overload for StringBuilder&lt;/a&gt;. The default behavior of this overload is to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/dfca02c17d430b7b983157154055a58939b22372/src/mongo/bson/bsonelement.cpp#L778-L787&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;truncate long strings to 150 bytes&lt;/a&gt;. This is true anywhere that we dump a BSONObj to a string (without explicitly specifying to print the entire object). This is important to ensure that long strings from user input do not cause other relevant information to be truncated from log lines or other debug output. Therefore, we would not make a general change to the stringification of BSONObj, but rather would fix this by writing special code to avoid the truncation of the &lt;tt&gt;comment&lt;/tt&gt; field.&lt;/p&gt;

&lt;p&gt;The most likely fix would apply to the &lt;tt&gt;comment&lt;/tt&gt; find and aggregate command parameter, but not to the &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/meta/comment/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;$comment match expression operator&lt;/a&gt;. For this reason, I would strongly encourage users who rely on &lt;tt&gt;$comment&lt;/tt&gt; to switch over to the comment command parameter. Currently, only find and aggregate support the comment parameter, but &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29794&quot; title=&quot;Adding a comment to all commands&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29794&quot;&gt;&lt;del&gt;SERVER-29794&lt;/del&gt;&lt;/a&gt; would add support for all commands.&lt;/p&gt;</comment>
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