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    <title>MongoDB Jira</title>
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    <description>This file is an XML representation of an issue</description>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-2879] Upgrade 1.6 to 1.8 changes shard member format requirements, cryptic error</title>
                <link>https://jira.mongodb.org/browse/SERVER-2879</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When upgrading from 1.6.4 to 1.8.0, which is supposed to be a drop-in replacement, mongos isn&apos;t connecting to members correctly. Various errors are seen, both in the logs and in the command line client, pointing to line 231 in shard.cpp.&lt;/p&gt;

&lt;p&gt;This turns out to be because the shards are set up in the config database without a name before the list of hosts in each replica set. I had to change this:&lt;/p&gt;

{ &quot;_id&quot; : &quot;27019&quot;, &quot;host&quot; : &quot;gold.private:27019,silver.private:27019&quot; }
{ &quot;_id&quot; : &quot;27020&quot;, &quot;host&quot; : &quot;tin.private:27020,lead.private:27020&quot; }

&lt;p&gt;to this:&lt;/p&gt;

{ &quot;_id&quot; : &quot;27019&quot;, &quot;host&quot; : &quot;27019/gold.private:27019,silver.private:27019&quot; }
{ &quot;_id&quot; : &quot;27020&quot;, &quot;host&quot; : &quot;27020/tin.private:27020,lead.private:27020&quot; }

&lt;p&gt;Firstly, the error message I got for this is extremely lacking. If there is something wrong with the string here then it should be pretty easy to tell the user that when the server starts up.&lt;/p&gt;

&lt;p&gt;Secondly, why has the behaviour changed? It seems like the id could easily be used to name the shard in this case. Where has this new requirement come from? It seems a bit dubious, due to breaking the upgrade from 1.6 to 1.8 which is supposed to be &quot;drop in&quot;.&lt;/p&gt;

&lt;p&gt;Mailing list thread: &lt;a href=&quot;http://groups.google.com/group/mongodb-user/browse_thread/thread/8a5562671b3b3bd9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://groups.google.com/group/mongodb-user/browse_thread/thread/8a5562671b3b3bd9&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="15402">SERVER-2879</key>
            <summary>Upgrade 1.6 to 1.8 changes shard member format requirements, cryptic error</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="eliot">Eliot Horowitz</assignee>
                                    <reporter username="jamespharaoh">James Pharaoh</reporter>
                        <labels>
                    </labels>
                <created>Thu, 31 Mar 2011 13:31:16 +0000</created>
                <updated>Tue, 12 Jul 2016 00:17:30 +0000</updated>
                            <resolved>Wed, 4 May 2011 19:55:13 +0000</resolved>
                                    <version>1.8.0</version>
                                    <fixVersion>1.9.1</fixVersion>
                                    <component>Replication</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="31031" author="auto" created="Wed, 4 May 2011 19:55:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: fix error message for invalid host format &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2879&quot; title=&quot;Upgrade 1.6 to 1.8 changes shard member format requirements, cryptic error&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2879&quot;&gt;&lt;del&gt;SERVER-2879&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3741503bec716a54f8fe3386096628d1accbbf7b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3741503bec716a54f8fe3386096628d1accbbf7b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="27408" author="eliot" created="Thu, 31 Mar 2011 13:37:45 +0000"  >&lt;p&gt;The reason for the change is sanity checking.&lt;br/&gt;
So that we know what replica set name you are expecting, and can check that to make sure we&apos;re talking to the right servers.&lt;br/&gt;
All to prevent logical corruption.&lt;/p&gt;</comment>
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