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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-6492] isMaster() hangs when called on REMOVED node</title>
                <link>https://jira.mongodb.org/browse/SERVER-6492</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When you call rs.isMaster() on a REMOVED node in a replica set it just hangs.&lt;/p&gt;</description>
                <environment></environment>
        <key id="44588">SERVER-6492</key>
            <summary>isMaster() hangs when called on REMOVED node</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="tyler@10gen.com">Tyler Brock</reporter>
                        <labels>
                    </labels>
                <created>Tue, 17 Jul 2012 19:32:09 +0000</created>
                <updated>Mon, 11 Jul 2016 17:57:03 +0000</updated>
                            <resolved>Mon, 23 Jul 2012 21:22:29 +0000</resolved>
                                    <version>2.1.2</version>
                                    <fixVersion>2.2.0-rc1</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="146110" author="auto" created="Mon, 23 Jul 2012 15:31:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-07-23T08:29:17-07:00&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6492&quot; title=&quot;isMaster() hangs when called on REMOVED node&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6492&quot;&gt;&lt;del&gt;SERVER-6492&lt;/del&gt;&lt;/a&gt; isMaster() no longer hangs on a REMOVED node&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e40c25fc61b0c3db0d6fdfab414ad5d0e5da4d19&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e40c25fc61b0c3db0d6fdfab414ad5d0e5da4d19&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="144268" author="tyler@10gen.com" created="Wed, 18 Jul 2012 02:20:15 +0000"  >&lt;p&gt;I think that at the very least isMaster should return &quot;isMaster&quot; along with ok.&lt;/p&gt;

&lt;p&gt;Even running on a standalone mongod it gives me 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;   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;/pre&gt;
			&lt;/td&gt;
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				&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;	&quot;ismaster&quot; : 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;   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;maxBsonObjectSize&quot; : 16777216,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;	&quot;localTime&quot; : ISODate(&quot;2012-07-18T02:17:53.924Z&quot;),&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;	&quot;ok&quot; : 1&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;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;
&lt;p&gt;For historical reasons, isMaster is used by drivers to also verify the maxBsonObjectSize, and get the time of the server. I think even if the member has been removed it needs, at a minimum, those three fields if not more that provide additional information such as the set it was a member of (&quot;setName&quot;) etc.&lt;/p&gt;</comment>
                            <comment id="144214" author="milkie" created="Tue, 17 Jul 2012 20:29:37 +0000"  >&lt;p&gt;Fair enough, we&apos;ll have to fix this for 2.2.  Would it be ok for isMaster to return ok:0?&lt;/p&gt;</comment>
                            <comment id="144204" author="tyler@10gen.com" created="Tue, 17 Jul 2012 20:22:57 +0000"  >&lt;p&gt;A majority of the MongoDB drivers depend on being able to call isMaster() on all members of a replica set to determine the health of the set, determine who the primary is, available non-hidden secondaries for reads, etc.&lt;/p&gt;

&lt;p&gt;If the driver has not yet detected that a node has been removed and attempts to call isMaster on them (which is the case for most drivers by default) it will hang.&lt;/p&gt;</comment>
                            <comment id="144189" author="milkie" created="Tue, 17 Jul 2012 20:08:52 +0000"  >&lt;p&gt;Why would you call rs.isMaster() on a REMOVED node using the shell?  This issue seems cosmetic and would be hard to do if you were using a driver to connect to a replica set.  You have to force the shell to directly connect to a removed node, after you&apos;ve removed it.&lt;br/&gt;
It won&apos;t be easy to fix except with a hack.  If you add the node back into the replica set, or shut it down, the command stops hanging.&lt;/p&gt;</comment>
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