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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-7249] poor error message and arguably shouldnt even give an error</title>
                <link>https://jira.mongodb.org/browse/SERVER-7249</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;in a system with 3 config servers, i shut down one of them.  i then did the following which returned an error.  (1) the message isn&apos;t very clear i would really like to know that a config server was unreachable not a mongod for example.  (2) arguably i shouldn&apos;t get an error at all the query could be retried to another server.  however be careful retries could add latency if multiple down and/or have a multiplicative effect on load. also is there a background detector of heartbeat?  that might help some as another approach.&lt;/p&gt;</description>
                <environment></environment>
        <key id="52183">SERVER-7249</key>
            <summary>poor error message and arguably shouldnt even give an error</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="5">Cannot Reproduce</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="dwight@mongodb.com">Dwight Merriman</reporter>
                        <labels>
                    </labels>
                <created>Wed, 3 Oct 2012 16:19:55 +0000</created>
                <updated>Wed, 10 Dec 2014 23:18:20 +0000</updated>
                            <resolved>Fri, 2 May 2014 17:44:21 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="570935" author="greg_10gen" created="Fri, 2 May 2014 17:44:21 +0000"  >&lt;p&gt;Think this issue has become stale - we&apos;ve clarified config messages a bit as well.&lt;/p&gt;

&lt;p&gt;Full fix will be when we move away from SCC - it prevents us from being smarter here.&lt;/p&gt;</comment>
                            <comment id="170998" author="dwight_10gen" created="Wed, 3 Oct 2012 16:43:49 +0000"  >&lt;p&gt;oops i had a couple of these and failed to post the example. &lt;/p&gt;

&lt;p&gt;one was something like this:&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;        ss &amp;lt;&amp;lt; _ei.code &amp;lt;&amp;lt; &quot; socket exception [&quot; &amp;lt;&amp;lt; _type &amp;lt;&amp;lt; &quot;] &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;another was &quot;all servers down!&quot;&lt;/p&gt;

&lt;p&gt;another:&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;Wed Oct 03 11:59:17 [conn68] warning: db exception when initializing on config:dm_hp:27019,dm_hp:27020,dm_hp:27021, current connection state is { state: { conn: &quot;SyncClusterConnection [dm_hp:27019,dm_&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;   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;hp:27020,dm_hp:27021]&quot;, vinfo: &quot;config:dm_hp:27019,dm_hp:27020,dm_hp:27021&quot;, cursor: &quot;(empty)&quot;, count: 0, done: false }, retryNext: false, init: false, finish: false, errored: false } :: caused by ::&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;8008 all servers down!&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 last one has some detail in the log but tine getlasterror message returned was very vague.&lt;/p&gt;

&lt;p&gt;basically i would recommend simulating different kinds of failiures (mongod, cluster managers) and see if the getlasterror results give you an inkling as to what is up. if config servers are down we should say that.  if shard 17 or 200 is down we should say that rather than a host name.&lt;/p&gt;</comment>
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