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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-16019] Add special  WT_CONNECTION::reconfigure command</title>
                <link>https://jira.mongodb.org/browse/SERVER-16019</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Add ability to reconfigure session level options like cache_size, etc.&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;Command%3A&quot;&gt;&lt;/a&gt;Command:&lt;/h3&gt;
&lt;p&gt;This command is surfaced as a &lt;b&gt;setParameter&lt;/b&gt; runtime option. It cannot be set at the command line, or via the config file.&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;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;  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;{ setParameter : 1, &quot;wiredTigerEngineRuntimeConfigSetting&quot; : &quot;key=value,key=value,...&quot; }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The supported settings are list &lt;a href=&quot;http://source.wiredtiger.com/2.4.0/struct_w_t___c_o_n_n_e_c_t_i_o_n.html#a579141678af06217b22869cbc604c6d4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; in the wired tiger documentation.&lt;/p&gt;

&lt;p&gt;Note, we place an additional restriction that we forbid embedded null characters in the string. &lt;/p&gt;

&lt;p/&gt;
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		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;  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;{ setParameter : 1, &quot;wiredTigerEngineRuntimeConfigSetting&quot; : &quot;key=value\0,key=value&quot; }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The string will get rejected due to the presence of &quot;\0&quot; (i.e., UTF-8 character 0) in the string.&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;Results%3A&quot;&gt;&lt;/a&gt;Results:&lt;/h3&gt;
&lt;p&gt;On success, &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;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;  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;{ ok : 1 } &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;On failure, &lt;/p&gt;
&lt;p/&gt;
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		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;  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;{ &quot;ok&quot; : 0, &quot;errmsg&quot; : &quot;WiredTiger reconfiguration failed with error code (22): Invalid argument&quot; }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;Unfortunately, WiredTiger does not provide a detail error message which we can return to the user. WiredTiger simply returns an error code in their API. The log file contains more information from WiredTiger.&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;Behavior%3A&quot;&gt;&lt;/a&gt;Behavior:&lt;/h3&gt;
&lt;p&gt;The updated config settings are logged to log file. The settings specified in the command are merged with the current wired tiger settings. If they same key is specified in both the current configuration, and new configuration, the value from the new configuration is chosen.&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;Caveats&quot;&gt;&lt;/a&gt;Caveats&lt;/h3&gt;
&lt;p&gt;There is no way to query the current settings from WiredTiger. &lt;b&gt;getParameter&lt;/b&gt; will always return an empty string when this setting is queried.&lt;/p&gt;</description>
                <environment></environment>
        <key id="166096">SERVER-16019</key>
            <summary>Add special  WT_CONNECTION::reconfigure command</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="9">Done</resolution>
                                        <assignee username="mark.benvenuto@mongodb.com">Mark Benvenuto</assignee>
                                    <reporter username="dan@mongodb.com">Daniel Pasette</reporter>
                        <labels>
                    </labels>
                <created>Wed, 29 Oct 2014 13:16:30 +0000</created>
                <updated>Fri, 17 May 2019 13:44:14 +0000</updated>
                            <resolved>Tue, 18 Nov 2014 20:36:30 +0000</resolved>
                                                    <fixVersion>2.8.0-rc1</fixVersion>
                                    <component>Admin</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="786678" author="xgen-internal-githook" created="Mon, 15 Dec 2014 23:50:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kangas&apos;, u&apos;name&apos;: u&apos;Matt Kangas&apos;, u&apos;email&apos;: u&apos;matt.kangas@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16019&quot; title=&quot;Add special  WT_CONNECTION::reconfigure command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16019&quot;&gt;&lt;del&gt;SERVER-16019&lt;/del&gt;&lt;/a&gt; parameter name wiredTigerEngineRuntimeConfig&lt;/p&gt;

&lt;p&gt;also rename class to WiredTigerEngineRuntimeConfigParameter&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9eaafcaff45ac51a1f924e0562ad8e3f21318e34&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9eaafcaff45ac51a1f924e0562ad8e3f21318e34&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="767377" author="xgen-internal-githook" created="Tue, 18 Nov 2014 21:48:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;markbenvenuto&apos;, u&apos;name&apos;: u&apos;Mark Benvenuto&apos;, u&apos;email&apos;: u&apos;mark.benvenuto@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16019&quot; title=&quot;Add special  WT_CONNECTION::reconfigure command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16019&quot;&gt;&lt;del&gt;SERVER-16019&lt;/del&gt;&lt;/a&gt;: Add support to setParameter for WT_CONNECTION::reconfigure&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5aedc94e6539773606c8276d192d5342665b7a59&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5aedc94e6539773606c8276d192d5342665b7a59&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="767303" author="xgen-internal-githook" created="Tue, 18 Nov 2014 20:33:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;markbenvenuto&apos;, u&apos;name&apos;: u&apos;Mark Benvenuto&apos;, u&apos;email&apos;: u&apos;mark.benvenuto@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16019&quot; title=&quot;Add special  WT_CONNECTION::reconfigure command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16019&quot;&gt;&lt;del&gt;SERVER-16019&lt;/del&gt;&lt;/a&gt;: Add support to setParameter for WT_CONNECTION::reconfigure&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7ec1120f79778344a57a6c65fa57cdf6480857ef&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7ec1120f79778344a57a6c65fa57cdf6480857ef&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10320">
                    <name>Documented</name>
                                                                <inwardlinks description="is documented by">
                                        <issuelink>
            <issuekey id="170493">DOCS-4406</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="217500">SERVER-19483</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
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