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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-30928] Add a fixture for testing rollback on top of ReplSetTest</title>
                <link>https://jira.mongodb.org/browse/SERVER-30928</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Many of our rollback javascript tests follow the same pattern of setting up a replica set, doing some operations, change the replica set configuration to induce rollback, do more operations that will be rolled back, check that the replica set is in a consistent state after rolling back.&lt;/p&gt;

&lt;p&gt;A lot of work goes into the template code to set up the cluster and trigger a roll back, so we should provide a unified interface that allows the user to define &lt;tt&gt;n&lt;/tt&gt; operations of which the first &lt;tt&gt;k&lt;/tt&gt; will be persisted and the last &lt;tt&gt;n-k&lt;/tt&gt; will be rolled back. This should make it significantly easier to add new rollback tests and to increase our test coverage of rollback.&lt;/p&gt;

&lt;p&gt;The existing tests should also be simplified to use the new rollback fixture.&lt;/p&gt;

&lt;p&gt;The RollbackFixture will wrap around a 3 node ReplSetTest with 1 arbiter, which is the setup used by all existing rollback JS tests. It will expose the following functions to the user:&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;- transitionToRollbackState() // isolate a node in the cluster such that all operations on it will be rolled back&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;- transitionToNormalState(waitForRollback=true) // un-isolate the node with the option of waiting for rollback to finish&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;- getPersistentNodeConn() // get a connection to the node whose operations won&apos;t be rolled back.&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;- getRollbackNodeConn() // get a connection to the node whose operations will be rolled back.&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;Internally it will keep track of the state of the replicaset with the following states: TRANSITIONING, STOPPED, ROLLBACK, NORMAL&lt;/p&gt;

&lt;p&gt;These set of functions should be sufficient for handling the rollback logic for the majority of rollback tests, but more complicated scenarios that require a specific sequence of partitions or more than 3 nodes in a replica set &lt;tt&gt;e.g. double_rollback.js&lt;/tt&gt; will not be able to use this fixture for the time being.&lt;/p&gt;</description>
                <environment></environment>
        <key id="422955">SERVER-30928</key>
            <summary>Add a fixture for testing rollback on top of ReplSetTest</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="13201">Fixed</resolution>
                                        <assignee username="robert.guo@mongodb.com">Robert Guo</assignee>
                                    <reporter username="robert.guo@mongodb.com">Robert Guo</reporter>
                        <labels>
                    </labels>
                <created>Fri, 1 Sep 2017 21:35:27 +0000</created>
                <updated>Mon, 30 Oct 2023 23:13:52 +0000</updated>
                            <resolved>Mon, 18 Sep 2017 21:13:03 +0000</resolved>
                                    <version>3.5.12</version>
                                    <fixVersion>3.6.0-rc0</fixVersion>
                                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1675938" author="xgen-internal-githook" created="Mon, 18 Sep 2017 21:10:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;guoyr&apos;, &apos;name&apos;: &apos;Robert Guo&apos;, &apos;email&apos;: &apos;robert.guo@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30928&quot; title=&quot;Add a fixture for testing rollback on top of ReplSetTest&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30928&quot;&gt;&lt;del&gt;SERVER-30928&lt;/del&gt;&lt;/a&gt; add fixture for testing rollback&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a0802c08237c56e76efd5055dec24cdaa3eedb94&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a0802c08237c56e76efd5055dec24cdaa3eedb94&lt;/a&gt;&lt;/p&gt;</comment>
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