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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-5625] New sharded connections to a namespace trigger setShardVersion on all shards</title>
                <link>https://jira.mongodb.org/browse/SERVER-5625</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #EEEEEE;border-color: #ccc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-color: #ccc;background-color: #6CB33F;&quot;&gt;&lt;b&gt;Issue Status as of January 8th, 2014&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #EEEEEE;&quot;&gt;
&lt;p&gt;&lt;b&gt;ISSUE SUMMARY&lt;/b&gt;&lt;br/&gt;
New sharded connections may fail to connect if any shard primary is down.&lt;/p&gt;

&lt;p&gt;This issue is part of 4 related issues which impact cluster availability when there is no primary available for a shard.  See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7246&quot; title=&quot;Mongos cannot do slaveOk queries when primary is down&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7246&quot;&gt;&lt;del&gt;SERVER-7246&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5625&quot; title=&quot;New sharded connections to a namespace trigger setShardVersion on all shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5625&quot;&gt;&lt;del&gt;SERVER-5625&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11971&quot; title=&quot;slaveok versioning logic in mongos should also apply to read prefs&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11971&quot;&gt;&lt;del&gt;SERVER-11971&lt;/del&gt;&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12041&quot; title=&quot;retry logic for read preferences should also apply on lazy recv() network failure&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12041&quot;&gt;&lt;del&gt;SERVER-12041&lt;/del&gt;&lt;/a&gt; for more details.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;USER IMPACT&lt;/b&gt;&lt;br/&gt;
When any replica set in a sharded cluster has no available primary, new connections may fail to perform secondary reads due to an initial heuristic shard version check, or initial authorization check.&lt;/p&gt;

&lt;p&gt;It is present in versions of MongoDB prior to and including v2.4.8.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;SOLUTION&lt;/b&gt;&lt;br/&gt;
Ignore failures of initial version check during connection and allow authorization against secondaries (primary is preferred when available).&lt;/p&gt;

&lt;p&gt;In v2.4.9 only (this is set by default in v2.6.0 and later), it is necessary to use the following two startup parameters for mongos:&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;   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 ignoreInitialVersionFailure=true&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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-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 authOnPrimaryOnly=false&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;&lt;b&gt;WORKAROUNDS&lt;/b&gt;&lt;br/&gt;
There is no workaround.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;PATCHES&lt;/b&gt;&lt;br/&gt;
Production release v2.4.9 contains the fix for this issue, and production release v2.6.0 will contain the fix as well.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h4&gt;&lt;a name=&quot;OriginalDescription&quot;&gt;&lt;/a&gt;Original Description&lt;/h4&gt;

&lt;p&gt;... if a shard is down, we get a socket exception or no master exception.  Issue is in _check in s/shardConnection.cpp&lt;/p&gt;</description>
                <environment></environment>
        <key id="36424">SERVER-5625</key>
            <summary>New sharded connections to a namespace trigger setShardVersion on all shards</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="9">Done</resolution>
                                        <assignee username="greg_10gen">Greg Studer</assignee>
                                    <reporter username="greg_10gen">Greg Studer</reporter>
                        <labels>
                    </labels>
                <created>Mon, 16 Apr 2012 21:41:24 +0000</created>
                <updated>Mon, 11 Jul 2016 18:33:53 +0000</updated>
                            <resolved>Fri, 20 Dec 2013 01:40:40 +0000</resolved>
                                                    <fixVersion>2.4.9</fixVersion>
                    <fixVersion>2.5.5</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="463896" author="xgen-internal-githook" created="Mon, 2 Dec 2013 14:13:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;gregstuder&apos;, u&apos;name&apos;: u&apos;Greg Studer&apos;, u&apos;email&apos;: u&apos;greg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5625&quot; title=&quot;New sharded connections to a namespace trigger setShardVersion on all shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5625&quot;&gt;&lt;del&gt;SERVER-5625&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7426&quot; title=&quot;The usePowerOf2Sizes option corrupts the db permanently and unrecoverably&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7426&quot;&gt;&lt;del&gt;SERVER-7426&lt;/del&gt;&lt;/a&gt; allow all connections in all states to tolerate downed shards and primaries&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/024a6739ac52ce669bff42b8782484f27a8cbc34&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/024a6739ac52ce669bff42b8782484f27a8cbc34&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="463726" author="xgen-internal-githook" created="Mon, 2 Dec 2013 02:50:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;gregstuder&apos;, u&apos;name&apos;: u&apos;Greg Studer&apos;, u&apos;email&apos;: u&apos;greg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5625&quot; title=&quot;New sharded connections to a namespace trigger setShardVersion on all shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5625&quot;&gt;&lt;del&gt;SERVER-5625&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7426&quot; title=&quot;The usePowerOf2Sizes option corrupts the db permanently and unrecoverably&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7426&quot;&gt;&lt;del&gt;SERVER-7426&lt;/del&gt;&lt;/a&gt; allow all connections in all states to tolerate downed shards and primaries&lt;br/&gt;
Branch: v2.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/45662915c2f4e7e19b8333dc93d0d2526d8a34c5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/45662915c2f4e7e19b8333dc93d0d2526d8a34c5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="459330" author="xgen-internal-githook" created="Wed, 20 Nov 2013 20:31:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;gregstuder&apos;, u&apos;name&apos;: u&apos;Greg Studer&apos;, u&apos;email&apos;: u&apos;greg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5625&quot; title=&quot;New sharded connections to a namespace trigger setShardVersion on all shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5625&quot;&gt;&lt;del&gt;SERVER-5625&lt;/del&gt;&lt;/a&gt; don&apos;t throw on problem setting shard version on initial connect&lt;br/&gt;
Branch: v2.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/38b3b8f7395d6717efd570a62dc1c2c085d1b049&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/38b3b8f7395d6717efd570a62dc1c2c085d1b049&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="26682">SERVER-4498</issuekey>
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            <issuekey id="41801">SERVER-6134</issuekey>
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            <issuelink>
            <issuekey id="52180">SERVER-7246</issuekey>
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            <issuekey id="74901">SERVER-9646</issuekey>
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                            <attachment id="15999" name="new_conn_shards.js" size="863" author="greg_10gen" created="Mon, 16 Apr 2012 21:41:25 +0000"/>
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