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    <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-75188] Properly handle errors when processing data size action response for defragmentation</title>
                <link>https://jira.mongodb.org/browse/SERVER-75188</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f2c0b594d7456e2d6b1b65789b4b0abbf3cc765f/src/mongo/db/s/balancer/balancer_defragmentation_policy_impl.cpp#L300&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this line&lt;/a&gt; it is assumed that the response can be parsed as a &lt;b&gt;StatusWith&amp;lt;DataSizeResponse&amp;gt;&lt;/b&gt;. However in case of errors it will be a simple &lt;b&gt;Status&lt;/b&gt;.&lt;/p&gt;

&lt;p&gt;This will trigger an unhandled std::exception crashing the server. A solution would be to adopt &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f2c0b594d7456e2d6b1b65789b4b0abbf3cc765f/src/mongo/db/s/balancer/auto_merger_policy.cpp#L156-L157&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the approach currently followed&lt;/a&gt; to handle exceptions when trying to parse a &lt;b&gt;StatusWith&amp;lt;NumMergedChunks&amp;gt;&lt;/b&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2296443">SERVER-75188</key>
            <summary>Properly handle errors when processing data size action response for defragmentation</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="13202">Works as Designed</resolution>
                                        <assignee username="allison.easton@mongodb.com">Allison Easton</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Thu, 23 Mar 2023 16:53:39 +0000</created>
                <updated>Fri, 27 Oct 2023 13:51:39 +0000</updated>
                            <resolved>Mon, 3 Apr 2023 17:08:45 +0000</resolved>
                                    <version>7.0.0-rc0</version>
                    <version>6.0.5</version>
                    <version>6.3.0-rc2</version>
                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5320183" author="pierlauro.sciarelli" created="Mon, 3 Apr 2023 17:08:45 +0000"  >&lt;p&gt;Closing the ticket because it turns out the issue was triggered by &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f2c0b594d7456e2d6b1b65789b4b0abbf3cc765f/src/mongo/db/s/balancer/auto_merger_policy_test.cpp#L422&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this test&lt;/a&gt; that was explicitly constructing a &lt;tt&gt;Status&lt;/tt&gt; rather than a &lt;tt&gt;StatusWith&lt;/tt&gt;. This was possible because the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f2c0b594d7456e2d6b1b65789b4b0abbf3cc765f/src/mongo/db/s/balancer/balancer_policy.h#L193-L194&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;BalancerStreamActionResponse is a variant&lt;/a&gt; hence it is totally possible to compile/execute with a wrongly typed response.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-75520&quot; title=&quot;Properly handle auto-merge responses&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-75520&quot;&gt;&lt;del&gt;SERVER-75520&lt;/del&gt;&lt;/a&gt; corrected the code that was handling the test-induced issue.&lt;/p&gt;</comment>
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            <issuekey id="1932963">SERVER-61727</issuekey>
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